<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2023 Workiva-->
<!--r:295f6de1-b748-47dc-aaeb-12564f49e471,g:14e68795-4835-484d-b50d-f610f6433910-->
<link:linkbase xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" xsi:schemaLocation="http://www.xbrl.org/2003/linkbase http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd">
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/all" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#all"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#hypercube-dimension"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-default"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#dimension-domain"/>
  <link:arcroleRef arcroleURI="http://xbrl.org/int/dim/arcrole/domain-member" xlink:type="simple" xlink:href="http://www.xbrl.org/2005/xbrldt-2005.xsd#domain-member"/>
  <link:roleRef roleURI="http://www.wdc.com/role/ConsolidatedBalanceSheets" xlink:type="simple" xlink:href="wdc-20230630.xsd#ConsolidatedBalanceSheets"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/ConsolidatedBalanceSheets" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_43a7dc77-f76d-4038-92b1-199ada5b938c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_10f3f002-f656-4cea-806d-bcd6ac7cf9dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_43a7dc77-f76d-4038-92b1-199ada5b938c" xlink:to="loc_us-gaap_AssetsAbstract_10f3f002-f656-4cea-806d-bcd6ac7cf9dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrentAbstract_483a5625-9f50-4932-a5c6-3a77e89ba892" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsCurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_10f3f002-f656-4cea-806d-bcd6ac7cf9dd" xlink:to="loc_us-gaap_AssetsCurrentAbstract_483a5625-9f50-4932-a5c6-3a77e89ba892" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_5bf7df69-f37b-49b2-8be5-ee0239de5de9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsAtCarryingValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_483a5625-9f50-4932-a5c6-3a77e89ba892" xlink:to="loc_us-gaap_CashAndCashEquivalentsAtCarryingValue_5bf7df69-f37b-49b2-8be5-ee0239de5de9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_d364ca65-96cc-4594-8d24-e6962a9d9e09" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_483a5625-9f50-4932-a5c6-3a77e89ba892" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_d364ca65-96cc-4594-8d24-e6962a9d9e09" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryNet_f3845a19-f22c-4350-86a8-6f3193178368" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InventoryNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_483a5625-9f50-4932-a5c6-3a77e89ba892" xlink:to="loc_us-gaap_InventoryNet_f3845a19-f22c-4350-86a8-6f3193178368" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsCurrent_4a4013ce-dd9a-4235-baca-53848380de95" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_483a5625-9f50-4932-a5c6-3a77e89ba892" xlink:to="loc_us-gaap_OtherAssetsCurrent_4a4013ce-dd9a-4235-baca-53848380de95" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsCurrent_58c9dbb7-51e8-4e62-995e-90a4bbed1a31" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsCurrentAbstract_483a5625-9f50-4932-a5c6-3a77e89ba892" xlink:to="loc_us-gaap_AssetsCurrent_58c9dbb7-51e8-4e62-995e-90a4bbed1a31" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsNoncurrentAbstract_9f99fd53-6594-4ea5-be9a-21a4979fb92e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_10f3f002-f656-4cea-806d-bcd6ac7cf9dd" xlink:to="loc_us-gaap_AssetsNoncurrentAbstract_9f99fd53-6594-4ea5-be9a-21a4979fb92e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_ca935f27-4b1e-40ea-91a8-d0b5bc57a648" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_9f99fd53-6594-4ea5-be9a-21a4979fb92e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_ca935f27-4b1e-40ea-91a8-d0b5bc57a648" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_NotesReceivableAndInvestmentsInRelatedParties_69300d3d-6be9-4da2-a193-22ceadfb5c19" xlink:href="wdc-20230630.xsd#wdc_NotesReceivableAndInvestmentsInRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_9f99fd53-6594-4ea5-be9a-21a4979fb92e" xlink:to="loc_wdc_NotesReceivableAndInvestmentsInRelatedParties_69300d3d-6be9-4da2-a193-22ceadfb5c19" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_c971de3e-001c-44bd-b14a-1b54596b3aef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_9f99fd53-6594-4ea5-be9a-21a4979fb92e" xlink:to="loc_us-gaap_Goodwill_c971de3e-001c-44bd-b14a-1b54596b3aef" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_ffd59ad2-7d4c-4d52-94e3-57ecef6ae3f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_9f99fd53-6594-4ea5-be9a-21a4979fb92e" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_ffd59ad2-7d4c-4d52-94e3-57ecef6ae3f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent_eae9768f-f727-4144-8674-26d56a084393" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsNoncurrentAbstract_9f99fd53-6594-4ea5-be9a-21a4979fb92e" xlink:to="loc_us-gaap_OtherAssetsNoncurrent_eae9768f-f727-4144-8674-26d56a084393" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Assets_1ddaf86a-8664-437e-a012-f53ee8ffb7f2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Assets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_10f3f002-f656-4cea-806d-bcd6ac7cf9dd" xlink:to="loc_us-gaap_Assets_1ddaf86a-8664-437e-a012-f53ee8ffb7f2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1934bd60-82dc-458b-8134-629c3d2cf7fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAndStockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_43a7dc77-f76d-4038-92b1-199ada5b938c" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1934bd60-82dc-458b-8134-629c3d2cf7fb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_3ba69e6f-2e1e-414d-898a-e361b4f635bb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1934bd60-82dc-458b-8134-629c3d2cf7fb" xlink:to="loc_us-gaap_LiabilitiesAbstract_3ba69e6f-2e1e-414d-898a-e361b4f635bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_5ad9c5e2-3e20-4f09-99a3-7992334f68ae" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_3ba69e6f-2e1e-414d-898a-e361b4f635bb" xlink:to="loc_us-gaap_AccountsPayableCurrent_5ad9c5e2-3e20-4f09-99a3-7992334f68ae" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent_16c2f27f-82f1-4e44-821d-92e5cafc33f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_3ba69e6f-2e1e-414d-898a-e361b4f635bb" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent_16c2f27f-82f1-4e44-821d-92e5cafc33f0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedIncomeTaxesCurrent_4df1b091-db2c-4ccd-a040-0b52b6fd8293" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedIncomeTaxesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_3ba69e6f-2e1e-414d-898a-e361b4f635bb" xlink:to="loc_us-gaap_AccruedIncomeTaxesCurrent_4df1b091-db2c-4ccd-a040-0b52b6fd8293" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_f97ac028-7d92-497f-b227-7b756f85e7ed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeRelatedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_3ba69e6f-2e1e-414d-898a-e361b4f635bb" xlink:to="loc_us-gaap_EmployeeRelatedLiabilitiesCurrent_f97ac028-7d92-497f-b227-7b756f85e7ed" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_94bf12b2-2e46-4974-81b1-889bed2997bf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_3ba69e6f-2e1e-414d-898a-e361b4f635bb" xlink:to="loc_us-gaap_LongTermDebtCurrent_94bf12b2-2e46-4974-81b1-889bed2997bf" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrent_765acdee-3a4a-4424-97c7-ee9cf43f1a5d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_3ba69e6f-2e1e-414d-898a-e361b4f635bb" xlink:to="loc_us-gaap_LiabilitiesCurrent_765acdee-3a4a-4424-97c7-ee9cf43f1a5d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesNoncurrentAbstract_0a2f2c9a-2ad4-47cb-8930-7119d332f682" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesNoncurrentAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1934bd60-82dc-458b-8134-629c3d2cf7fb" xlink:to="loc_us-gaap_LiabilitiesNoncurrentAbstract_0a2f2c9a-2ad4-47cb-8930-7119d332f682" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_10fc8a98-4b52-497d-8a50-183a866b691f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_0a2f2c9a-2ad4-47cb-8930-7119d332f682" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_10fc8a98-4b52-497d-8a50-183a866b691f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherLiabilitiesNoncurrent_614eea6d-5398-4deb-ade7-af20fe7cf546" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherLiabilitiesNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesNoncurrentAbstract_0a2f2c9a-2ad4-47cb-8930-7119d332f682" xlink:to="loc_us-gaap_OtherLiabilitiesNoncurrent_614eea6d-5398-4deb-ade7-af20fe7cf546" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Liabilities_0cc7bb12-5b07-4c9b-a78f-4712a31aead7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Liabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1934bd60-82dc-458b-8134-629c3d2cf7fb" xlink:to="loc_us-gaap_Liabilities_0cc7bb12-5b07-4c9b-a78f-4712a31aead7" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommitmentsAndContingencies_17549fcd-b060-4791-99c2-d06af6462cc7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommitmentsAndContingencies"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1934bd60-82dc-458b-8134-629c3d2cf7fb" xlink:to="loc_us-gaap_CommitmentsAndContingencies_17549fcd-b060-4791-99c2-d06af6462cc7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_540ee294-349c-4cac-830e-cfa403e0499a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityCarryingAmountAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1934bd60-82dc-458b-8134-629c3d2cf7fb" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountAttributableToParent_540ee294-349c-4cac-830e-cfa403e0499a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquityAbstract_d84e18a0-67dc-45ce-8ace-689907a338a9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquityAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAndStockholdersEquityAbstract_1934bd60-82dc-458b-8134-629c3d2cf7fb" xlink:to="loc_us-gaap_StockholdersEquityAbstract_d84e18a0-67dc-45ce-8ace-689907a338a9" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_CommonStockValues_99c90814-63fa-43db-b972-d331e0fb4ab3" xlink:href="wdc-20230630.xsd#wdc_CommonStockValues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d84e18a0-67dc-45ce-8ace-689907a338a9" xlink:to="loc_wdc_CommonStockValues_99c90814-63fa-43db-b972-d331e0fb4ab3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_06f17cdd-c281-4333-8021-86758194b22b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d84e18a0-67dc-45ce-8ace-689907a338a9" xlink:to="loc_us-gaap_AdditionalPaidInCapital_06f17cdd-c281-4333-8021-86758194b22b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_8e0ff0c4-d24b-4c44-9249-d241dc1279dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d84e18a0-67dc-45ce-8ace-689907a338a9" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax_8e0ff0c4-d24b-4c44-9249-d241dc1279dd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_906f43bb-d305-43ac-87bd-5e50740564a8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d84e18a0-67dc-45ce-8ace-689907a338a9" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_906f43bb-d305-43ac-87bd-5e50740564a8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_cc1300e1-60fa-4328-940f-006babbe73ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StockholdersEquityAbstract_d84e18a0-67dc-45ce-8ace-689907a338a9" xlink:to="loc_us-gaap_StockholdersEquity_cc1300e1-60fa-4328-940f-006babbe73ea" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAndStockholdersEquity_d4f60af1-5b35-47b6-b8b5-e2fb6e39f386" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAndStockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_43a7dc77-f76d-4038-92b1-199ada5b938c" xlink:to="loc_us-gaap_LiabilitiesAndStockholdersEquity_d4f60af1-5b35-47b6-b8b5-e2fb6e39f386" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_0dc195bc-881e-4e45-9852-05aeac76c51e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_43a7dc77-f76d-4038-92b1-199ada5b938c" xlink:to="loc_us-gaap_StatementTable_0dc195bc-881e-4e45-9852-05aeac76c51e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1d77104b-c0ff-4171-ba05-13b25de373a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_0dc195bc-881e-4e45-9852-05aeac76c51e" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1d77104b-c0ff-4171-ba05-13b25de373a2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_1d77104b-c0ff-4171-ba05-13b25de373a2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1d77104b-c0ff-4171-ba05-13b25de373a2" xlink:to="loc_us-gaap_RelatedPartyDomain_1d77104b-c0ff-4171-ba05-13b25de373a2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_40ac5d72-7910-4020-9ff2-56f2d2a788b9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_1d77104b-c0ff-4171-ba05-13b25de373a2" xlink:to="loc_us-gaap_RelatedPartyDomain_40ac5d72-7910-4020-9ff2-56f2d2a788b9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NonrelatedPartyMember_3df52118-3bdf-4660-9e0a-2e15f50c6317" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NonrelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_40ac5d72-7910-4020-9ff2-56f2d2a788b9" xlink:to="loc_us-gaap_NonrelatedPartyMember_3df52118-3bdf-4660-9e0a-2e15f50c6317" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_3dec68a3-0732-46cd-8199-788897c0c8a8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_40ac5d72-7910-4020-9ff2-56f2d2a788b9" xlink:to="loc_us-gaap_RelatedPartyMember_3dec68a3-0732-46cd-8199-788897c0c8a8" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/ConsolidatedStatementsofConvertiblePreferredStockandShareholdersEquity" xlink:type="simple" xlink:href="wdc-20230630.xsd#ConsolidatedStatementsofConvertiblePreferredStockandShareholdersEquity"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/ConsolidatedStatementsofConvertiblePreferredStockandShareholdersEquity" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementLineItems_2be745a8-8282-4dfc-9a9f-8cd14adcee2e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_448783da-2005-4611-a099-8ec4995a1aec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInTemporaryEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2be745a8-8282-4dfc-9a9f-8cd14adcee2e" xlink:to="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_448783da-2005-4611-a099-8ec4995a1aec" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_0998f065-186e-4e0e-8a21-18b6878b477d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_448783da-2005-4611-a099-8ec4995a1aec" xlink:to="loc_us-gaap_TemporaryEquitySharesOutstanding_0998f065-186e-4e0e-8a21-18b6878b477d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_691c42ff-9462-408f-ab35-9c78b59e6a1f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_448783da-2005-4611-a099-8ec4995a1aec" xlink:to="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_691c42ff-9462-408f-ab35-9c78b59e6a1f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues_bf1b9e6e-b76e-4566-8624-357a61162dcd" xlink:href="wdc-20230630.xsd#wdc_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_448783da-2005-4611-a099-8ec4995a1aec" xlink:to="loc_wdc_TemporaryEquityStockIssuedDuringPeriodSharesNewIssues_bf1b9e6e-b76e-4566-8624-357a61162dcd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues_e585d509-94cc-492e-aa44-1d0294b031c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInTemporaryEquityRollForward_448783da-2005-4611-a099-8ec4995a1aec" xlink:to="loc_us-gaap_TemporaryEquityStockIssuedDuringPeriodValueNewIssues_e585d509-94cc-492e-aa44-1d0294b031c0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesOutstanding_4b7c0506-ab63-4af6-959f-2030e035436c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquitySharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests_a7627e95-82d1-4fec-9ffc-648c65d0b608" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityCarryingAmountIncludingPortionAttributableToNoncontrollingInterests"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncreaseDecreaseInStockholdersEquityRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_StatementLineItems_2be745a8-8282-4dfc-9a9f-8cd14adcee2e" xlink:to="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_eae3bd7a-4d11-40bf-88a1-412a1379c6c9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:to="loc_us-gaap_CommonStockSharesOutstanding_eae3bd7a-4d11-40bf-88a1-412a1379c6c9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_1dea59e3-2322-4398-9565-f57e098a0cf9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:to="loc_us-gaap_StockholdersEquity_1dea59e3-2322-4398-9565-f57e098a0cf9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_695eefdb-f155-421c-8e72-876ae02cb824" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:to="loc_us-gaap_TreasuryStockCommonShares_695eefdb-f155-421c-8e72-876ae02cb824" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NetIncomeLoss_1ae7017d-4b5b-4764-9a71-ab59d4203279" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NetIncomeLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:to="loc_us-gaap_NetIncomeLoss_1ae7017d-4b5b-4764-9a71-ab59d4203279" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_1479c75d-03ba-4b55-a48a-4f828231cd63" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_1479c75d-03ba-4b55-a48a-4f828231cd63" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_13eab0f8-e6ee-475f-affb-47938d2d56ee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_13eab0f8-e6ee-475f-affb-47938d2d56ee" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_c888f846-58c8-4741-8d2d-b8cf33cf36f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:to="loc_us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue_c888f846-58c8-4741-8d2d-b8cf33cf36f4" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_039c702c-203c-4dd1-a659-4f724ccea327" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_039c702c-203c-4dd1-a659-4f724ccea327" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_d43d63ef-356e-4bcb-83f1-c3dda4c56e67" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:to="loc_us-gaap_OtherComprehensiveIncomeForeignCurrencyTransactionAndTranslationGainLossArisingDuringPeriodNetOfTax_d43d63ef-356e-4bcb-83f1-c3dda4c56e67" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_84ae0bbd-b218-4ffd-a362-3c470ca75efc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncreaseDecreaseInStockholdersEquityRollForward_912b9c53-1698-4e60-bf5e-21295f1c03fc" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossCashFlowHedgeGainLossBeforeReclassificationAfterTax_84ae0bbd-b218-4ffd-a362-3c470ca75efc" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockSharesOutstanding_f988e070-400d-4216-a52a-f37ef0942422" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockSharesOutstanding"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_c78c6f1a-fe85-4dd9-97dc-0ef7903bb1a9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonShares_197dfaaf-a988-4fe1-bbf0-8b1f5b7316cb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonShares"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementTable_f5db1c7d-7228-4319-93de-d2a090dd8de5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_StatementLineItems_2be745a8-8282-4dfc-9a9f-8cd14adcee2e" xlink:to="loc_us-gaap_StatementTable_f5db1c7d-7228-4319-93de-d2a090dd8de5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_5fc4a61b-57fc-4e25-88d9-adaa7ac673b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_f5db1c7d-7228-4319-93de-d2a090dd8de5" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_5fc4a61b-57fc-4e25-88d9-adaa7ac673b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_5fc4a61b-57fc-4e25-88d9-adaa7ac673b6_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_5fc4a61b-57fc-4e25-88d9-adaa7ac673b6" xlink:to="loc_us-gaap_EquityComponentDomain_5fc4a61b-57fc-4e25-88d9-adaa7ac673b6_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_c1daeb49-fcdd-4c01-bf07-23617ba3d6fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_5fc4a61b-57fc-4e25-88d9-adaa7ac673b6" xlink:to="loc_us-gaap_EquityComponentDomain_c1daeb49-fcdd-4c01-bf07-23617ba3d6fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CommonStockMember_e749491e-bb29-42b8-a953-2846941e0520" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CommonStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_c1daeb49-fcdd-4c01-bf07-23617ba3d6fa" xlink:to="loc_us-gaap_CommonStockMember_e749491e-bb29-42b8-a953-2846941e0520" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockCommonMember_e09a62c0-2395-4ffb-99d6-ec401470d836" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockCommonMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_c1daeb49-fcdd-4c01-bf07-23617ba3d6fa" xlink:to="loc_us-gaap_TreasuryStockCommonMember_e09a62c0-2395-4ffb-99d6-ec401470d836" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapitalMember_68690e3f-9e5d-4292-9aad-b720c2f9b6b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapitalMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_c1daeb49-fcdd-4c01-bf07-23617ba3d6fa" xlink:to="loc_us-gaap_AdditionalPaidInCapitalMember_68690e3f-9e5d-4292-9aad-b720c2f9b6b6" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f83082dd-20ba-41cc-bd6d-730d74922f3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_c1daeb49-fcdd-4c01-bf07-23617ba3d6fa" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_f83082dd-20ba-41cc-bd6d-730d74922f3e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsMember_754f14c3-9699-4073-a055-98cdef44842b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_c1daeb49-fcdd-4c01-bf07-23617ba3d6fa" xlink:to="loc_us-gaap_RetainedEarningsMember_754f14c3-9699-4073-a055-98cdef44842b" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_139bee23-433e-4aec-94c8-855a217d7a64" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_StatementTable_f5db1c7d-7228-4319-93de-d2a090dd8de5" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_139bee23-433e-4aec-94c8-855a217d7a64" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_139bee23-433e-4aec-94c8-855a217d7a64_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_139bee23-433e-4aec-94c8-855a217d7a64" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_139bee23-433e-4aec-94c8-855a217d7a64_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_707a8428-74ed-4c93-8352-3531b2e6d6d4" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_139bee23-433e-4aec-94c8-855a217d7a64" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_707a8428-74ed-4c93-8352-3531b2e6d6d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_fa9da1be-ab7f-448e-8e08-8b5803b79dce" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_707a8428-74ed-4c93-8352-3531b2e6d6d4" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_fa9da1be-ab7f-448e-8e08-8b5803b79dce" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/OrganizationandBasisofPresentationAdditionalInformationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#OrganizationandBasisofPresentationAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/OrganizationandBasisofPresentationAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6d80cb36-8a1d-405d-85ac-de15fe3e2815" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_31fe0bc5-01c4-44ba-8037-704797b971ed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6d80cb36-8a1d-405d-85ac-de15fe3e2815" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_31fe0bc5-01c4-44ba-8037-704797b971ed" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ProductWarrantyTerm_14a1fb3d-43d9-48e9-8420-93dc87189b64" xlink:href="wdc-20230630.xsd#wdc_ProductWarrantyTerm"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6d80cb36-8a1d-405d-85ac-de15fe3e2815" xlink:to="loc_wdc_ProductWarrantyTerm_14a1fb3d-43d9-48e9-8420-93dc87189b64" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdvertisingExpense_9e468eb5-10e1-4be9-8a21-b070bb4eab32" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdvertisingExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6d80cb36-8a1d-405d-85ac-de15fe3e2815" xlink:to="loc_us-gaap_AdvertisingExpense_9e468eb5-10e1-4be9-8a21-b070bb4eab32" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ef353262-c3f5-44e8-9eab-883f1cc9d326" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6d80cb36-8a1d-405d-85ac-de15fe3e2815" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_ef353262-c3f5-44e8-9eab-883f1cc9d326" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeNotionalAmount_30a74146-d024-4eab-bde6-81c05c97f30d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeNotionalAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6d80cb36-8a1d-405d-85ac-de15fe3e2815" xlink:to="loc_us-gaap_DerivativeNotionalAmount_30a74146-d024-4eab-bde6-81c05c97f30d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_90eb0f70-faf0-4d53-8b3a-2f7f08ca8b89" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_6d80cb36-8a1d-405d-85ac-de15fe3e2815" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_90eb0f70-faf0-4d53-8b3a-2f7f08ca8b89" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_3c5b82fb-90fb-4320-8489-631f8a516e7e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_90eb0f70-faf0-4d53-8b3a-2f7f08ca8b89" xlink:to="loc_srt_RangeAxis_3c5b82fb-90fb-4320-8489-631f8a516e7e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_3c5b82fb-90fb-4320-8489-631f8a516e7e_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_3c5b82fb-90fb-4320-8489-631f8a516e7e" xlink:to="loc_srt_RangeMember_3c5b82fb-90fb-4320-8489-631f8a516e7e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_008b7399-f7bc-4079-bc6e-5f483c7829bb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_3c5b82fb-90fb-4320-8489-631f8a516e7e" xlink:to="loc_srt_RangeMember_008b7399-f7bc-4079-bc6e-5f483c7829bb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_6ea0074a-8f52-4386-add1-0eddbe7eaf89" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_008b7399-f7bc-4079-bc6e-5f483c7829bb" xlink:to="loc_srt_MinimumMember_6ea0074a-8f52-4386-add1-0eddbe7eaf89" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_46ab432c-b24f-453f-9381-9532736ea095" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_008b7399-f7bc-4079-bc6e-5f483c7829bb" xlink:to="loc_srt_MaximumMember_46ab432c-b24f-453f-9381-9532736ea095" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_0fc7fbde-a840-48c3-8bdc-404d0e857907" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_90eb0f70-faf0-4d53-8b3a-2f7f08ca8b89" xlink:to="loc_us-gaap_DebtInstrumentAxis_0fc7fbde-a840-48c3-8bdc-404d0e857907" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_0fc7fbde-a840-48c3-8bdc-404d0e857907_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_0fc7fbde-a840-48c3-8bdc-404d0e857907" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_0fc7fbde-a840-48c3-8bdc-404d0e857907_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_67d793a4-221e-4c24-aaf8-1bfb213be56b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_0fc7fbde-a840-48c3-8bdc-404d0e857907" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_67d793a4-221e-4c24-aaf8-1bfb213be56b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember_82b2db32-8d0e-445c-a6d0-68c5bc7701dc" xlink:href="wdc-20230630.xsd#wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_67d793a4-221e-4c24-aaf8-1bfb213be56b" xlink:to="loc_wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember_82b2db32-8d0e-445c-a6d0-68c5bc7701dc" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_f51c1c9e-049f-4e2d-b0fe-dc4817ea2617" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_90eb0f70-faf0-4d53-8b3a-2f7f08ca8b89" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_f51c1c9e-049f-4e2d-b0fe-dc4817ea2617" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f51c1c9e-049f-4e2d-b0fe-dc4817ea2617_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f51c1c9e-049f-4e2d-b0fe-dc4817ea2617" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f51c1c9e-049f-4e2d-b0fe-dc4817ea2617_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_20d5d583-e7d8-4dfb-aa6e-b1b69e886b83" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f51c1c9e-049f-4e2d-b0fe-dc4817ea2617" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_20d5d583-e7d8-4dfb-aa6e-b1b69e886b83" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_2bacf17a-1265-4198-b482-eb2f252f63ee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_20d5d583-e7d8-4dfb-aa6e-b1b69e886b83" xlink:to="loc_us-gaap_ConvertibleDebtMember_2bacf17a-1265-4198-b482-eb2f252f63ee" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/OrganizationandBasisofPresentationPropertyPlantandEquipmentUsefulLifeDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#OrganizationandBasisofPresentationPropertyPlantandEquipmentUsefulLifeDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/OrganizationandBasisofPresentationPropertyPlantandEquipmentUsefulLifeDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentLineItems_d978242a-4e0a-4f33-85f1-37b859fe5596" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_41f11f3b-e4c8-46d8-afa7-4f91d812c5e1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentUsefulLife"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_d978242a-4e0a-4f33-85f1-37b859fe5596" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentUsefulLife_41f11f3b-e4c8-46d8-afa7-4f91d812c5e1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_101a3b5a-3859-4c28-9a96-e34b5b209adb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfPropertyPlantAndEquipmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentLineItems_d978242a-4e0a-4f33-85f1-37b859fe5596" xlink:to="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_101a3b5a-3859-4c28-9a96-e34b5b209adb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_9affe551-a984-4a67-b7f6-2c46c6cddcbb" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_101a3b5a-3859-4c28-9a96-e34b5b209adb" xlink:to="loc_srt_RangeAxis_9affe551-a984-4a67-b7f6-2c46c6cddcbb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_9affe551-a984-4a67-b7f6-2c46c6cddcbb_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_9affe551-a984-4a67-b7f6-2c46c6cddcbb" xlink:to="loc_srt_RangeMember_9affe551-a984-4a67-b7f6-2c46c6cddcbb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_e33f2ecc-d196-4a18-807b-4f97e290584d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_9affe551-a984-4a67-b7f6-2c46c6cddcbb" xlink:to="loc_srt_RangeMember_e33f2ecc-d196-4a18-807b-4f97e290584d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_a564f790-41f7-4885-b66d-f6c6cd19b48d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e33f2ecc-d196-4a18-807b-4f97e290584d" xlink:to="loc_srt_MinimumMember_a564f790-41f7-4885-b66d-f6c6cd19b48d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_76ef9599-1aec-4d99-819c-b490485552a1" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_e33f2ecc-d196-4a18-807b-4f97e290584d" xlink:to="loc_srt_MaximumMember_76ef9599-1aec-4d99-819c-b490485552a1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_87f51b07-bcf1-42ab-b85a-309a68f938a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfPropertyPlantAndEquipmentTable_101a3b5a-3859-4c28-9a96-e34b5b209adb" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_87f51b07-bcf1-42ab-b85a-309a68f938a0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_87f51b07-bcf1-42ab-b85a-309a68f938a0_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_87f51b07-bcf1-42ab-b85a-309a68f938a0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_87f51b07-bcf1-42ab-b85a-309a68f938a0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5405b0b9-d4b6-4c01-bc13-8878b5e6df2f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_87f51b07-bcf1-42ab-b85a-309a68f938a0" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5405b0b9-d4b6-4c01-bc13-8878b5e6df2f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingMember_51ee3830-b02b-4dae-8db3-095798cb9b5b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BuildingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5405b0b9-d4b6-4c01-bc13-8878b5e6df2f" xlink:to="loc_us-gaap_BuildingMember_51ee3830-b02b-4dae-8db3-095798cb9b5b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_bcfde02e-d6e4-4547-a398-9c62dc2ef7e8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_5405b0b9-d4b6-4c01-bc13-8878b5e6df2f" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_bcfde02e-d6e4-4547-a398-9c62dc2ef7e8" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/RecentAccountingPronouncementsAdditionalInformationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#RecentAccountingPronouncementsAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/RecentAccountingPronouncementsAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_82e2678d-d3fe-4d60-9f8f-b6a68591895a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdditionalPaidInCapital_079dc435-e16a-4124-a625-3abb31321c79" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdditionalPaidInCapital"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_82e2678d-d3fe-4d60-9f8f-b6a68591895a" xlink:to="loc_us-gaap_AdditionalPaidInCapital_079dc435-e16a-4124-a625-3abb31321c79" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscount_60a12e39-95d6-4b12-9dbd-2313e84df7c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_82e2678d-d3fe-4d60-9f8f-b6a68591895a" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscount_60a12e39-95d6-4b12-9dbd-2313e84df7c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_6d18f1a0-7bab-4d87-921f-f55d100b3f48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredIncomeTaxLiabilitiesNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_82e2678d-d3fe-4d60-9f8f-b6a68591895a" xlink:to="loc_us-gaap_DeferredIncomeTaxLiabilitiesNet_6d18f1a0-7bab-4d87-921f-f55d100b3f48" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsAccumulatedDeficit_aabbf210-534c-4468-b523-46eb1553407f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsAccumulatedDeficit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_82e2678d-d3fe-4d60-9f8f-b6a68591895a" xlink:to="loc_us-gaap_RetainedEarningsAccumulatedDeficit_aabbf210-534c-4468-b523-46eb1553407f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfDebtDiscountPremium_f6d0c171-9002-4a3a-9788-2b7f2568e5a8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfDebtDiscountPremium"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_82e2678d-d3fe-4d60-9f8f-b6a68591895a" xlink:to="loc_us-gaap_AmortizationOfDebtDiscountPremium_f6d0c171-9002-4a3a-9788-2b7f2568e5a8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_8bc8b8b4-2d98-4142-b292-531f63b0c73f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleLineItems_82e2678d-d3fe-4d60-9f8f-b6a68591895a" xlink:to="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_8bc8b8b4-2d98-4142-b292-531f63b0c73f" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_12325f0b-4043-4795-b7df-f7d66eae4c6d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdjustmentsForNewAccountingPronouncementsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_8bc8b8b4-2d98-4142-b292-531f63b0c73f" xlink:to="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_12325f0b-4043-4795-b7df-f7d66eae4c6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_12325f0b-4043-4795-b7df-f7d66eae4c6d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_12325f0b-4043-4795-b7df-f7d66eae4c6d" xlink:to="loc_us-gaap_TypeOfAdoptionMember_12325f0b-4043-4795-b7df-f7d66eae4c6d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfAdoptionMember_6d522600-5645-441b-a8fa-c9630f7390d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfAdoptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AdjustmentsForNewAccountingPronouncementsAxis_12325f0b-4043-4795-b7df-f7d66eae4c6d" xlink:to="loc_us-gaap_TypeOfAdoptionMember_6d522600-5645-441b-a8fa-c9630f7390d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountingStandardsUpdate202006Member_49252b20-d6cd-462b-8b35-53cf4bdd70dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountingStandardsUpdate202006Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfAdoptionMember_6d522600-5645-441b-a8fa-c9630f7390d8" xlink:to="loc_us-gaap_AccountingStandardsUpdate202006Member_49252b20-d6cd-462b-8b35-53cf4bdd70dd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_59321c0a-cb4b-4001-86e2-fe0e3f5f5849" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CumulativeEffectPeriodOfAdoptionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_NewAccountingPronouncementsOrChangeInAccountingPrincipleTable_8bc8b8b4-2d98-4142-b292-531f63b0c73f" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_59321c0a-cb4b-4001-86e2-fe0e3f5f5849" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_59321c0a-cb4b-4001-86e2-fe0e3f5f5849_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_59321c0a-cb4b-4001-86e2-fe0e3f5f5849" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_59321c0a-cb4b-4001-86e2-fe0e3f5f5849_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_f78808d7-e35d-4e44-9afc-f3007df89cb7" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CumulativeEffectPeriodOfAdoptionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionAxis_59321c0a-cb4b-4001-86e2-fe0e3f5f5849" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_f78808d7-e35d-4e44-9afc-f3007df89cb7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_2bfec4f7-11d0-4743-84cf-511c4b4c49ef" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_CumulativeEffectPeriodOfAdoptionDomain_f78808d7-e35d-4e44-9afc-f3007df89cb7" xlink:to="loc_srt_CumulativeEffectPeriodOfAdoptionAdjustmentMember_2bfec4f7-11d0-4743-84cf-511c4b4c49ef" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskSegmentReportingInformationbySegmentDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#BusinessSegmentsGeographicInformationandConcentrationsofRiskSegmentReportingInformationbySegmentDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskSegmentReportingInformationbySegmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_8abcd2ba-c346-486e-b637-4b90d793cc93" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_020e08aa-7f94-4f27-9efa-69a665d6d01f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8abcd2ba-c346-486e-b637-4b90d793cc93" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_020e08aa-7f94-4f27-9efa-69a665d6d01f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_cdbbb853-b9cb-4d65-8dc0-af97100439ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GrossProfit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8abcd2ba-c346-486e-b637-4b90d793cc93" xlink:to="loc_us-gaap_GrossProfit_cdbbb853-b9cb-4d65-8dc0-af97100439ad" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensation_6169d923-7eac-4ce5-bb15-3f1a14e86f34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8abcd2ba-c346-486e-b637-4b90d793cc93" xlink:to="loc_us-gaap_ShareBasedCompensation_6169d923-7eac-4ce5-bb15-3f1a14e86f34" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AmortizationOfIntangibleAssets_a73184f0-3cb1-418d-aa07-8ebb06d61c58" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AmortizationOfIntangibleAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8abcd2ba-c346-486e-b637-4b90d793cc93" xlink:to="loc_us-gaap_AmortizationOfIntangibleAssets_a73184f0-3cb1-418d-aa07-8ebb06d61c58" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductionRelatedImpairmentsOrCharges_03fc0aba-e7e5-4852-8ede-6f3d864ed0a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProductionRelatedImpairmentsOrCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8abcd2ba-c346-486e-b637-4b90d793cc93" xlink:to="loc_us-gaap_ProductionRelatedImpairmentsOrCharges_03fc0aba-e7e5-4852-8ede-6f3d864ed0a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ChargesRelatedToPowerOutageIncidentAndRelatedRecovery_71aade2e-3a09-4ece-98ac-dc3207ee7225" xlink:href="wdc-20230630.xsd#wdc_ChargesRelatedToPowerOutageIncidentAndRelatedRecovery"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8abcd2ba-c346-486e-b637-4b90d793cc93" xlink:to="loc_wdc_ChargesRelatedToPowerOutageIncidentAndRelatedRecovery_71aade2e-3a09-4ece-98ac-dc3207ee7225" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherExpenses_af4f39de-beef-40b9-a615-a0fcefc68968" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherExpenses"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8abcd2ba-c346-486e-b637-4b90d793cc93" xlink:to="loc_us-gaap_OtherExpenses_af4f39de-beef-40b9-a615-a0fcefc68968" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GrossProfit_7fff15eb-6a16-4bc0-bd8d-7a23e8515fd0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GrossProfit"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_GrossMarginPercentage_db22b2cb-1159-47b3-ac22-d927c19ffa55" xlink:href="wdc-20230630.xsd#wdc_GrossMarginPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8abcd2ba-c346-486e-b637-4b90d793cc93" xlink:to="loc_wdc_GrossMarginPercentage_db22b2cb-1159-47b3-ac22-d927c19ffa55" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_33314a1d-a73b-442a-af25-c8c8689e2128" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_8abcd2ba-c346-486e-b637-4b90d793cc93" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_33314a1d-a73b-442a-af25-c8c8689e2128" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6ee723b4-8c9b-4548-8b6e-cd929a2199e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_33314a1d-a73b-442a-af25-c8c8689e2128" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6ee723b4-8c9b-4548-8b6e-cd929a2199e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6ee723b4-8c9b-4548-8b6e-cd929a2199e4_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6ee723b4-8c9b-4548-8b6e-cd929a2199e4" xlink:to="loc_us-gaap_SegmentDomain_6ee723b4-8c9b-4548-8b6e-cd929a2199e4_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_34ed753c-f409-480d-a22a-ef43dd91b00b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6ee723b4-8c9b-4548-8b6e-cd929a2199e4" xlink:to="loc_us-gaap_SegmentDomain_34ed753c-f409-480d-a22a-ef43dd91b00b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_FlashSegmentMember_42ab9840-a2b4-4b22-b58b-57bee7e1c1d9" xlink:href="wdc-20230630.xsd#wdc_FlashSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_34ed753c-f409-480d-a22a-ef43dd91b00b" xlink:to="loc_wdc_FlashSegmentMember_42ab9840-a2b4-4b22-b58b-57bee7e1c1d9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_HDDMember_2b529fcf-dc47-4c99-9d68-cb3c58d6f6c7" xlink:href="wdc-20230630.xsd#wdc_HDDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_34ed753c-f409-480d-a22a-ef43dd91b00b" xlink:to="loc_wdc_HDDMember_2b529fcf-dc47-4c99-9d68-cb3c58d6f6c7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsAxis_be071e74-eb55-4e84-847f-f87a8ff175e7" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_33314a1d-a73b-442a-af25-c8c8689e2128" xlink:to="loc_srt_ConsolidationItemsAxis_be071e74-eb55-4e84-847f-f87a8ff175e7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_be071e74-eb55-4e84-847f-f87a8ff175e7_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ConsolidationItemsAxis_be071e74-eb55-4e84-847f-f87a8ff175e7" xlink:to="loc_srt_ConsolidationItemsDomain_be071e74-eb55-4e84-847f-f87a8ff175e7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ConsolidationItemsDomain_80e56cc3-0a69-479a-a394-c6bcd127563b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ConsolidationItemsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ConsolidationItemsAxis_be071e74-eb55-4e84-847f-f87a8ff175e7" xlink:to="loc_srt_ConsolidationItemsDomain_80e56cc3-0a69-479a-a394-c6bcd127563b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingSegmentsMember_29015dbe-5895-4a72-af48-d948daadfb49" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingSegmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_80e56cc3-0a69-479a-a394-c6bcd127563b" xlink:to="loc_us-gaap_OperatingSegmentsMember_29015dbe-5895-4a72-af48-d948daadfb49" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CorporateNonSegmentMember_8a1bac12-dbca-47e4-8870-5bd9d2a72d85" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CorporateNonSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ConsolidationItemsDomain_80e56cc3-0a69-479a-a394-c6bcd127563b" xlink:to="loc_us-gaap_CorporateNonSegmentMember_8a1bac12-dbca-47e4-8870-5bd9d2a72d85" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskDisaggregationofRevenueDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#BusinessSegmentsGeographicInformationandConcentrationsofRiskDisaggregationofRevenueDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskDisaggregationofRevenueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueLineItems_efba53e2-d0c9-4e40-8929-4e32b0439a92" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_66535def-d313-4d6c-8db5-459d4726052f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_efba53e2-d0c9-4e40-8929-4e32b0439a92" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_66535def-d313-4d6c-8db5-459d4726052f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DisaggregationOfRevenueTable_aff11b8f-60e2-4c3e-b67b-e8dfe5f5cd7e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DisaggregationOfRevenueTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DisaggregationOfRevenueLineItems_efba53e2-d0c9-4e40-8929-4e32b0439a92" xlink:to="loc_us-gaap_DisaggregationOfRevenueTable_aff11b8f-60e2-4c3e-b67b-e8dfe5f5cd7e" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductOrServiceAxis_86ee2721-340f-457e-b2a4-ce54be5e147c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductOrServiceAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DisaggregationOfRevenueTable_aff11b8f-60e2-4c3e-b67b-e8dfe5f5cd7e" xlink:to="loc_srt_ProductOrServiceAxis_86ee2721-340f-457e-b2a4-ce54be5e147c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_86ee2721-340f-457e-b2a4-ce54be5e147c_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ProductOrServiceAxis_86ee2721-340f-457e-b2a4-ce54be5e147c" xlink:to="loc_srt_ProductsAndServicesDomain_86ee2721-340f-457e-b2a4-ce54be5e147c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ProductsAndServicesDomain_12749b19-347a-4cf2-ae31-11721f330114" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ProductsAndServicesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ProductOrServiceAxis_86ee2721-340f-457e-b2a4-ce54be5e147c" xlink:to="loc_srt_ProductsAndServicesDomain_12749b19-347a-4cf2-ae31-11721f330114" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_CloudMember_e9cf1943-93ad-49d9-9545-980cb2aca14e" xlink:href="wdc-20230630.xsd#wdc_CloudMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_12749b19-347a-4cf2-ae31-11721f330114" xlink:to="loc_wdc_CloudMember_e9cf1943-93ad-49d9-9545-980cb2aca14e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ClientDevicesMember_9a4ec666-3f48-4be6-af2f-68fcf1279478" xlink:href="wdc-20230630.xsd#wdc_ClientDevicesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_12749b19-347a-4cf2-ae31-11721f330114" xlink:to="loc_wdc_ClientDevicesMember_9a4ec666-3f48-4be6-af2f-68fcf1279478" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ConsumerMember_f79cac02-0a20-4983-bfa2-aab95db6df0b" xlink:href="wdc-20230630.xsd#wdc_ConsumerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ProductsAndServicesDomain_12749b19-347a-4cf2-ae31-11721f330114" xlink:to="loc_wdc_ConsumerMember_f79cac02-0a20-4983-bfa2-aab95db6df0b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskRevenuebyGeographyDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#BusinessSegmentsGeographicInformationandConcentrationsofRiskRevenuebyGeographyDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskRevenuebyGeographyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_8d289271-63b7-4c1c-b1d5-c77324d7da51" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_7b8b633e-f107-42f7-8cb6-31fd6026b852" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_8d289271-63b7-4c1c-b1d5-c77324d7da51" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerExcludingAssessedTax_7b8b633e-f107-42f7-8cb6-31fd6026b852" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_8ce436c1-d005-4c85-9644-46b6250e8942" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EntityWideInformationRevenueFromExternalCustomerLineItems_8d289271-63b7-4c1c-b1d5-c77324d7da51" xlink:to="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_8ce436c1-d005-4c85-9644-46b6250e8942" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_ae49f350-0ad1-4101-9264-2e82221ff64f" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfEntityWideInformationRevenueFromExternalCustomersByProductsAndServicesTable_8ce436c1-d005-4c85-9644-46b6250e8942" xlink:to="loc_srt_StatementGeographicalAxis_ae49f350-0ad1-4101-9264-2e82221ff64f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_ae49f350-0ad1-4101-9264-2e82221ff64f_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_ae49f350-0ad1-4101-9264-2e82221ff64f" xlink:to="loc_srt_SegmentGeographicalDomain_ae49f350-0ad1-4101-9264-2e82221ff64f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_8f0fcf3e-f6cf-4677-9acd-1bb7feeb2446" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_ae49f350-0ad1-4101-9264-2e82221ff64f" xlink:to="loc_srt_SegmentGeographicalDomain_8f0fcf3e-f6cf-4677-9acd-1bb7feeb2446" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_91ff0c3b-1bfc-48b9-8996-6a1d79dbf502" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8f0fcf3e-f6cf-4677-9acd-1bb7feeb2446" xlink:to="loc_country_US_91ff0c3b-1bfc-48b9-8996-6a1d79dbf502" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_f999e9d3-39f5-4453-abf4-6675286a441b" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8f0fcf3e-f6cf-4677-9acd-1bb7feeb2446" xlink:to="loc_country_CN_f999e9d3-39f5-4453-abf4-6675286a441b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_HK_13e2ef8d-bc94-4f02-a681-31464193bb40" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_HK"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8f0fcf3e-f6cf-4677-9acd-1bb7feeb2446" xlink:to="loc_country_HK_13e2ef8d-bc94-4f02-a681-31464193bb40" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaMember_f64ff421-b820-4fde-9a5b-ddf5576b5936" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8f0fcf3e-f6cf-4677-9acd-1bb7feeb2446" xlink:to="loc_srt_AsiaMember_f64ff421-b820-4fde-9a5b-ddf5576b5936" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_4cbc2a92-fc77-4945-86b6-3e1ce7f7b3a7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8f0fcf3e-f6cf-4677-9acd-1bb7feeb2446" xlink:to="loc_us-gaap_EMEAMember_4cbc2a92-fc77-4945-86b6-3e1ce7f7b3a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_OtherMember_1fbf55cd-38d8-4a8c-945c-ce95c786147b" xlink:href="wdc-20230630.xsd#wdc_OtherMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_8f0fcf3e-f6cf-4677-9acd-1bb7feeb2446" xlink:to="loc_wdc_OtherMember_1fbf55cd-38d8-4a8c-945c-ce95c786147b" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskLonglivedAssetsbyGeographyDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#BusinessSegmentsGeographicInformationandConcentrationsofRiskLonglivedAssetsbyGeographyDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskLonglivedAssetsbyGeographyDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_48c58849-50bd-4c44-9f11-1db14faf90fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NoncurrentAssets_94788906-4941-4dc3-a112-8c17361ddc83" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NoncurrentAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_48c58849-50bd-4c44-9f11-1db14faf90fc" xlink:to="loc_us-gaap_NoncurrentAssets_94788906-4941-4dc3-a112-8c17361ddc83" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_f082d2f6-43bd-4f11-83fa-b8f9d9b2398d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RevenuesFromExternalCustomersAndLongLivedAssetsLineItems_48c58849-50bd-4c44-9f11-1db14faf90fc" xlink:to="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_f082d2f6-43bd-4f11-83fa-b8f9d9b2398d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementGeographicalAxis_d80fe206-598e-444b-bae1-75182181ab03" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementGeographicalAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRevenuesFromExternalCustomersAndLongLivedAssetsTable_f082d2f6-43bd-4f11-83fa-b8f9d9b2398d" xlink:to="loc_srt_StatementGeographicalAxis_d80fe206-598e-444b-bae1-75182181ab03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_d80fe206-598e-444b-bae1-75182181ab03_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementGeographicalAxis_d80fe206-598e-444b-bae1-75182181ab03" xlink:to="loc_srt_SegmentGeographicalDomain_d80fe206-598e-444b-bae1-75182181ab03_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_SegmentGeographicalDomain_22eb483b-6c4c-4364-bf22-80918acdde2d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_SegmentGeographicalDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementGeographicalAxis_d80fe206-598e-444b-bae1-75182181ab03" xlink:to="loc_srt_SegmentGeographicalDomain_22eb483b-6c4c-4364-bf22-80918acdde2d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_US_c5de864b-3488-43a7-9156-abd9bc2951f6" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_US"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_22eb483b-6c4c-4364-bf22-80918acdde2d" xlink:to="loc_country_US_c5de864b-3488-43a7-9156-abd9bc2951f6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_MY_6ac8a268-a392-436a-892e-62f769a6baba" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_MY"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_22eb483b-6c4c-4364-bf22-80918acdde2d" xlink:to="loc_country_MY_6ac8a268-a392-436a-892e-62f769a6baba" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_CN_99b2ee3a-f360-4a50-ac64-5c4d96d3596a" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_CN"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_22eb483b-6c4c-4364-bf22-80918acdde2d" xlink:to="loc_country_CN_99b2ee3a-f360-4a50-ac64-5c4d96d3596a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_country_TH_3b8ca7d9-8e45-4abd-8e45-a412a4d85821" xlink:href="https://xbrl.sec.gov/country/2023/country-2023.xsd#country_TH"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_22eb483b-6c4c-4364-bf22-80918acdde2d" xlink:to="loc_country_TH_3b8ca7d9-8e45-4abd-8e45-a412a4d85821" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_AsiaMember_dc4da2cb-3e0c-4e51-9f46-c900b48d8913" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_AsiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_22eb483b-6c4c-4364-bf22-80918acdde2d" xlink:to="loc_srt_AsiaMember_dc4da2cb-3e0c-4e51-9f46-c900b48d8913" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EMEAMember_80c75d20-d4bc-461c-a0d1-f73246f07a6e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EMEAMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_SegmentGeographicalDomain_22eb483b-6c4c-4364-bf22-80918acdde2d" xlink:to="loc_us-gaap_EMEAMember_80c75d20-d4bc-461c-a0d1-f73246f07a6e" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskAdditionalInformationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#BusinessSegmentsGeographicInformationandConcentrationsofRiskAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskLineItems_ae9c9684-b63c-4a1c-8c98-63a57be1c46f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_20c7371b-3cef-41d6-98b2-1322d13a88d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_ae9c9684-b63c-4a1c-8c98-63a57be1c46f" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_20c7371b-3cef-41d6-98b2-1322d13a88d4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsReceivableNetCurrent_78c14292-53c2-4a8a-91e0-3ce42b53f9ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsReceivableNetCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_ae9c9684-b63c-4a1c-8c98-63a57be1c46f" xlink:to="loc_us-gaap_AccountsReceivableNetCurrent_78c14292-53c2-4a8a-91e0-3ce42b53f9ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_EntityWideAccountsReceivableMajorCustomerPercentage_2a32c35d-c61e-47ce-be2d-92ba96ae0a48" xlink:href="wdc-20230630.xsd#wdc_EntityWideAccountsReceivableMajorCustomerPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_ae9c9684-b63c-4a1c-8c98-63a57be1c46f" xlink:to="loc_wdc_EntityWideAccountsReceivableMajorCustomerPercentage_2a32c35d-c61e-47ce-be2d-92ba96ae0a48" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_b7d65955-1003-4987-a6c4-775e0a9ca277" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_ae9c9684-b63c-4a1c-8c98-63a57be1c46f" xlink:to="loc_us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount_b7d65955-1003-4987-a6c4-775e0a9ca277" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillImpairmentLoss_601dc390-aaf1-4fb5-a461-cf3afbf5f5fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillImpairmentLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_ae9c9684-b63c-4a1c-8c98-63a57be1c46f" xlink:to="loc_us-gaap_GoodwillImpairmentLoss_601dc390-aaf1-4fb5-a461-cf3afbf5f5fa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTable_210fda73-c8fe-4264-938b-b3849303586b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ConcentrationRiskLineItems_ae9c9684-b63c-4a1c-8c98-63a57be1c46f" xlink:to="loc_us-gaap_ConcentrationRiskTable_210fda73-c8fe-4264-938b-b3849303586b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_d5d6f38c-2cff-4c33-95b0-f0be4bf245fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_210fda73-c8fe-4264-938b-b3849303586b" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_d5d6f38c-2cff-4c33-95b0-f0be4bf245fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_d5d6f38c-2cff-4c33-95b0-f0be4bf245fa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_d5d6f38c-2cff-4c33-95b0-f0be4bf245fa" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_d5d6f38c-2cff-4c33-95b0-f0be4bf245fa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_64fee4a2-a9ca-4ffa-8913-6ac933353a10" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_d5d6f38c-2cff-4c33-95b0-f0be4bf245fa" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_64fee4a2-a9ca-4ffa-8913-6ac933353a10" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerConcentrationRiskMember_8596b856-1197-4b36-84c9-16f626bc0dc0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CustomerConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_64fee4a2-a9ca-4ffa-8913-6ac933353a10" xlink:to="loc_us-gaap_CustomerConcentrationRiskMember_8596b856-1197-4b36-84c9-16f626bc0dc0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MajorCustomersAxis_b4aaf177-8062-4ed8-b3fc-a9d6b1776a45" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MajorCustomersAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_210fda73-c8fe-4264-938b-b3849303586b" xlink:to="loc_srt_MajorCustomersAxis_b4aaf177-8062-4ed8-b3fc-a9d6b1776a45" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_b4aaf177-8062-4ed8-b3fc-a9d6b1776a45_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_MajorCustomersAxis_b4aaf177-8062-4ed8-b3fc-a9d6b1776a45" xlink:to="loc_srt_NameOfMajorCustomerDomain_b4aaf177-8062-4ed8-b3fc-a9d6b1776a45_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_NameOfMajorCustomerDomain_e4fe4a86-9e77-4c8c-936e-e693e2f1a1ec" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_NameOfMajorCustomerDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_MajorCustomersAxis_b4aaf177-8062-4ed8-b3fc-a9d6b1776a45" xlink:to="loc_srt_NameOfMajorCustomerDomain_e4fe4a86-9e77-4c8c-936e-e693e2f1a1ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TopTenCustomersMember_2995bdc4-44df-49c2-a6ce-e30534b4dcc6" xlink:href="wdc-20230630.xsd#wdc_TopTenCustomersMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_e4fe4a86-9e77-4c8c-936e-e693e2f1a1ec" xlink:to="loc_wdc_TopTenCustomersMember_2995bdc4-44df-49c2-a6ce-e30534b4dcc6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ArrowElectronicsIncMember_e366cece-7dd3-4ddc-adcc-2b0ed6f89991" xlink:href="wdc-20230630.xsd#wdc_ArrowElectronicsIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_e4fe4a86-9e77-4c8c-936e-e693e2f1a1ec" xlink:to="loc_wdc_ArrowElectronicsIncMember_e366cece-7dd3-4ddc-adcc-2b0ed6f89991" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_AppleIncMember_98258eb5-0b53-4f49-aeee-895e9309f045" xlink:href="wdc-20230630.xsd#wdc_AppleIncMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_NameOfMajorCustomerDomain_e4fe4a86-9e77-4c8c-936e-e693e2f1a1ec" xlink:to="loc_wdc_AppleIncMember_98258eb5-0b53-4f49-aeee-895e9309f045" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1d1c4fa7-7b9c-4470-b22e-2f4ef4d9c9da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_210fda73-c8fe-4264-938b-b3849303586b" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1d1c4fa7-7b9c-4470-b22e-2f4ef4d9c9da" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_1d1c4fa7-7b9c-4470-b22e-2f4ef4d9c9da_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1d1c4fa7-7b9c-4470-b22e-2f4ef4d9c9da" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_1d1c4fa7-7b9c-4470-b22e-2f4ef4d9c9da_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e5642084-73db-4dc0-b359-f58938c180e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_1d1c4fa7-7b9c-4470-b22e-2f4ef4d9c9da" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e5642084-73db-4dc0-b359-f58938c180e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_b95af9af-fd42-4c53-947a-de6cf068ab48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e5642084-73db-4dc0-b359-f58938c180e4" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerMember_b95af9af-fd42-4c53-947a-de6cf068ab48" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_6340d04e-14df-4608-98ca-7fca7beebbbd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ConcentrationRiskTable_210fda73-c8fe-4264-938b-b3849303586b" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_6340d04e-14df-4608-98ca-7fca7beebbbd" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_6340d04e-14df-4608-98ca-7fca7beebbbd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6340d04e-14df-4608-98ca-7fca7beebbbd" xlink:to="loc_us-gaap_SegmentDomain_6340d04e-14df-4608-98ca-7fca7beebbbd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_4b8a7955-eb80-47cc-b366-48d3e8554df5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_6340d04e-14df-4608-98ca-7fca7beebbbd" xlink:to="loc_us-gaap_SegmentDomain_4b8a7955-eb80-47cc-b366-48d3e8554df5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_FlashSegmentMember_f057b3be-6469-4858-a2eb-68deefe67c4c" xlink:href="wdc-20230630.xsd#wdc_FlashSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4b8a7955-eb80-47cc-b366-48d3e8554df5" xlink:to="loc_wdc_FlashSegmentMember_f057b3be-6469-4858-a2eb-68deefe67c4c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_HDDMember_11b764de-2000-4a85-99fe-d7fdfbd106f0" xlink:href="wdc-20230630.xsd#wdc_HDDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_4b8a7955-eb80-47cc-b366-48d3e8554df5" xlink:to="loc_wdc_HDDMember_11b764de-2000-4a85-99fe-d7fdfbd106f0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskGoodwillRollforwardDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#BusinessSegmentsGeographicInformationandConcentrationsofRiskGoodwillRollforwardDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/BusinessSegmentsGeographicInformationandConcentrationsofRiskGoodwillRollforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentReportingInformationLineItems_4e60b9a9-377e-4bf3-8831-d40b837f9a1e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentReportingInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillRollForward_b10a7682-43ff-4633-9cf1-5c799b16083a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4e60b9a9-377e-4bf3-8831-d40b837f9a1e" xlink:to="loc_us-gaap_GoodwillRollForward_b10a7682-43ff-4633-9cf1-5c799b16083a" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_1b326959-e1a8-4b61-9f54-e503e8206d9e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_b10a7682-43ff-4633-9cf1-5c799b16083a" xlink:to="loc_us-gaap_Goodwill_1b326959-e1a8-4b61-9f54-e503e8206d9e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_7d6fd364-f185-414f-976f-685031a2cd6d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GoodwillForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GoodwillRollForward_b10a7682-43ff-4633-9cf1-5c799b16083a" xlink:to="loc_us-gaap_GoodwillForeignCurrencyTranslationGainLoss_7d6fd364-f185-414f-976f-685031a2cd6d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Goodwill_32397f9e-2bc6-400b-b1f5-7c49a9905ebe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Goodwill"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_452fd0fc-8970-4394-866d-d0d418a24b34" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_SegmentReportingInformationLineItems_4e60b9a9-377e-4bf3-8831-d40b837f9a1e" xlink:to="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_452fd0fc-8970-4394-866d-d0d418a24b34" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_2321fd1c-1c6a-4cf6-97c2-0818b816ddeb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementBusinessSegmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfSegmentReportingInformationBySegmentTable_452fd0fc-8970-4394-866d-d0d418a24b34" xlink:to="loc_us-gaap_StatementBusinessSegmentsAxis_2321fd1c-1c6a-4cf6-97c2-0818b816ddeb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_2321fd1c-1c6a-4cf6-97c2-0818b816ddeb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2321fd1c-1c6a-4cf6-97c2-0818b816ddeb" xlink:to="loc_us-gaap_SegmentDomain_2321fd1c-1c6a-4cf6-97c2-0818b816ddeb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SegmentDomain_b4af135e-e01a-4008-a03e-e13788e31a20" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SegmentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementBusinessSegmentsAxis_2321fd1c-1c6a-4cf6-97c2-0818b816ddeb" xlink:to="loc_us-gaap_SegmentDomain_b4af135e-e01a-4008-a03e-e13788e31a20" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_FlashSegmentMember_862c1d88-f47b-48a8-8213-f3ac589af541" xlink:href="wdc-20230630.xsd#wdc_FlashSegmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b4af135e-e01a-4008-a03e-e13788e31a20" xlink:to="loc_wdc_FlashSegmentMember_862c1d88-f47b-48a8-8213-f3ac589af541" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_HDDMember_828a8a5d-1da5-4a89-a049-d34c73cdb279" xlink:href="wdc-20230630.xsd#wdc_HDDMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SegmentDomain_b4af135e-e01a-4008-a03e-e13788e31a20" xlink:to="loc_wdc_HDDMember_828a8a5d-1da5-4a89-a049-d34c73cdb279" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/SupplementalFinancialStatementDataPropertyPlantandEquipmentDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#SupplementalFinancialStatementDataPropertyPlantandEquipmentDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/SupplementalFinancialStatementDataPropertyPlantandEquipmentDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wdc_SupplementalFinancialInformationLineItems_c54d63bf-2a11-4837-b0e4-cd43015705c5" xlink:href="wdc-20230630.xsd#wdc_SupplementalFinancialInformationLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_ce7a71ed-d2f7-4261-8058-7e871d67393e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentNetAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_SupplementalFinancialInformationLineItems_c54d63bf-2a11-4837-b0e4-cd43015705c5" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_ce7a71ed-d2f7-4261-8058-7e871d67393e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentGross_6dc11e79-6660-438a-bc4c-684a8508e392" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_ce7a71ed-d2f7-4261-8058-7e871d67393e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentGross_6dc11e79-6660-438a-bc4c-684a8508e392" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_ff3434c1-06d6-4067-82c8-362974beaf9e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_ce7a71ed-d2f7-4261-8058-7e871d67393e" xlink:to="loc_us-gaap_AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment_ff3434c1-06d6-4067-82c8-362974beaf9e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentNet_406ecdb7-c9cc-4dd2-8935-fe6fb78b93c5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentNetAbstract_ce7a71ed-d2f7-4261-8058-7e871d67393e" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentNet_406ecdb7-c9cc-4dd2-8935-fe6fb78b93c5" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_SupplementalFinancialInformationTable_434a6e78-1678-4606-8a51-3b00a5453480" xlink:href="wdc-20230630.xsd#wdc_SupplementalFinancialInformationTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wdc_SupplementalFinancialInformationLineItems_c54d63bf-2a11-4837-b0e4-cd43015705c5" xlink:to="loc_wdc_SupplementalFinancialInformationTable_434a6e78-1678-4606-8a51-3b00a5453480" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_aa05a5f1-a705-4286-8368-067d8c55f37b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_SupplementalFinancialInformationTable_434a6e78-1678-4606-8a51-3b00a5453480" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_aa05a5f1-a705-4286-8368-067d8c55f37b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_aa05a5f1-a705-4286-8368-067d8c55f37b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_aa05a5f1-a705-4286-8368-067d8c55f37b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_aa05a5f1-a705-4286-8368-067d8c55f37b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3a60f8bb-dfbf-49ae-8e7e-1f42574ad90b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PropertyPlantAndEquipmentTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentByTypeAxis_aa05a5f1-a705-4286-8368-067d8c55f37b" xlink:to="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3a60f8bb-dfbf-49ae-8e7e-1f42574ad90b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LandMember_83dc6d06-c372-4cb8-9658-5c1d80dd6764" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LandMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3a60f8bb-dfbf-49ae-8e7e-1f42574ad90b" xlink:to="loc_us-gaap_LandMember_83dc6d06-c372-4cb8-9658-5c1d80dd6764" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BuildingAndBuildingImprovementsMember_8cb7e05a-9d7c-4cf7-99c8-61b2b20feec1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BuildingAndBuildingImprovementsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3a60f8bb-dfbf-49ae-8e7e-1f42574ad90b" xlink:to="loc_us-gaap_BuildingAndBuildingImprovementsMember_8cb7e05a-9d7c-4cf7-99c8-61b2b20feec1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MachineryAndEquipmentMember_2cb5e001-58da-40fd-a777-5e872f0947df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MachineryAndEquipmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3a60f8bb-dfbf-49ae-8e7e-1f42574ad90b" xlink:to="loc_us-gaap_MachineryAndEquipmentMember_2cb5e001-58da-40fd-a777-5e872f0947df" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ComputerEquipmentandSoftwareMember_f2923847-1505-420b-94bd-1ba813f22de0" xlink:href="wdc-20230630.xsd#wdc_ComputerEquipmentandSoftwareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3a60f8bb-dfbf-49ae-8e7e-1f42574ad90b" xlink:to="loc_wdc_ComputerEquipmentandSoftwareMember_f2923847-1505-420b-94bd-1ba813f22de0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FurnitureAndFixturesMember_c5b7fac5-8693-462d-99f0-df30bb3c305f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FurnitureAndFixturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3a60f8bb-dfbf-49ae-8e7e-1f42574ad90b" xlink:to="loc_us-gaap_FurnitureAndFixturesMember_c5b7fac5-8693-462d-99f0-df30bb3c305f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConstructionInProgressMember_70bbdc0f-ac6d-43a8-bd8a-b66bf0664420" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConstructionInProgressMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PropertyPlantAndEquipmentTypeDomain_3a60f8bb-dfbf-49ae-8e7e-1f42574ad90b" xlink:to="loc_us-gaap_ConstructionInProgressMember_70bbdc0f-ac6d-43a8-bd8a-b66bf0664420" xlink:type="arc" order="5"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/SupplementalFinancialStatementDataIntangibleAssetsDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#SupplementalFinancialStatementDataIntangibleAssetsDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/SupplementalFinancialStatementDataIntangibleAssetsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_54b4b7fe-c142-459f-9ef5-9b0a5d5874f5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetWeightedAveragePeriodBeforeRenewalOrExtension_00b63a52-a3d6-4061-ba72-32de558aee73" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AcquiredFiniteLivedIntangibleAssetWeightedAveragePeriodBeforeRenewalOrExtension"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_54b4b7fe-c142-459f-9ef5-9b0a5d5874f5" xlink:to="loc_us-gaap_AcquiredFiniteLivedIntangibleAssetWeightedAveragePeriodBeforeRenewalOrExtension_00b63a52-a3d6-4061-ba72-32de558aee73" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsGross_4eee7c10-8b9d-49c0-8205-8861bf5ba177" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_54b4b7fe-c142-459f-9ef5-9b0a5d5874f5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsGross_4eee7c10-8b9d-49c0-8205-8861bf5ba177" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_5b71538f-6691-4da2-81cc-c276218558b0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_54b4b7fe-c142-459f-9ef5-9b0a5d5874f5" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsExcludingGoodwill_5b71538f-6691-4da2-81cc-c276218558b0" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_1679e678-f098-49ce-abcf-ea20f4cdf404" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsGrossExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_54b4b7fe-c142-459f-9ef5-9b0a5d5874f5" xlink:to="loc_us-gaap_IntangibleAssetsGrossExcludingGoodwill_1679e678-f098-49ce-abcf-ea20f4cdf404" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_1f1c924f-a82f-43db-894f-2a1d6cf7ca01" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_54b4b7fe-c142-459f-9ef5-9b0a5d5874f5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsAccumulatedAmortization_1f1c924f-a82f-43db-894f-2a1d6cf7ca01" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsNet_dce7ba9b-d8a2-4aea-9cee-e41071c40218" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_54b4b7fe-c142-459f-9ef5-9b0a5d5874f5" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsNet_dce7ba9b-d8a2-4aea-9cee-e41071c40218" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_07ca76ef-d266-4206-a452-d291a2cca0d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IntangibleAssetsNetExcludingGoodwill"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_54b4b7fe-c142-459f-9ef5-9b0a5d5874f5" xlink:to="loc_us-gaap_IntangibleAssetsNetExcludingGoodwill_07ca76ef-d266-4206-a452-d291a2cca0d3" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_83f732d7-66a9-4fb2-aa0f-c6010efef51c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsLineItems_54b4b7fe-c142-459f-9ef5-9b0a5d5874f5" xlink:to="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_83f732d7-66a9-4fb2-aa0f-c6010efef51c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9da14f09-ba19-4d4d-b108-29a2e60d4f4c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_83f732d7-66a9-4fb2-aa0f-c6010efef51c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9da14f09-ba19-4d4d-b108-29a2e60d4f4c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9da14f09-ba19-4d4d-b108-29a2e60d4f4c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9da14f09-ba19-4d4d-b108-29a2e60d4f4c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_9da14f09-ba19-4d4d-b108-29a2e60d4f4c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_201dd33a-74a3-40a0-b94c-161b55d357bc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis_9da14f09-ba19-4d4d-b108-29a2e60d4f4c" xlink:to="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_201dd33a-74a3-40a0-b94c-161b55d357bc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ExistingTechnologyMember_59508589-9d08-4404-a7d1-3a75225c6bc5" xlink:href="wdc-20230630.xsd#wdc_ExistingTechnologyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_201dd33a-74a3-40a0-b94c-161b55d357bc" xlink:to="loc_wdc_ExistingTechnologyMember_59508589-9d08-4404-a7d1-3a75225c6bc5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TradenamesandtrademarksMember_6957cbff-0403-44cb-b668-a733b2167af4" xlink:href="wdc-20230630.xsd#wdc_TradenamesandtrademarksMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_201dd33a-74a3-40a0-b94c-161b55d357bc" xlink:to="loc_wdc_TradenamesandtrademarksMember_6957cbff-0403-44cb-b668-a733b2167af4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CustomerRelationshipsMember_511ea872-c9db-49cd-a842-b9fc51dab96c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CustomerRelationshipsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_201dd33a-74a3-40a0-b94c-161b55d357bc" xlink:to="loc_us-gaap_CustomerRelationshipsMember_511ea872-c9db-49cd-a842-b9fc51dab96c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_LeaseholdInterestsMember_09e84be4-59b8-4bc9-be40-e3be4b9882cf" xlink:href="wdc-20230630.xsd#wdc_LeaseholdInterestsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FiniteLivedIntangibleAssetsMajorClassNameDomain_201dd33a-74a3-40a0-b94c-161b55d357bc" xlink:to="loc_wdc_LeaseholdInterestsMember_09e84be4-59b8-4bc9-be40-e3be4b9882cf" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_23709fc6-540c-4ebe-8dc3-5b0a8d6dc6fd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfFiniteLivedIntangibleAssetsTable_83f732d7-66a9-4fb2-aa0f-c6010efef51c" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_23709fc6-540c-4ebe-8dc3-5b0a8d6dc6fd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_23709fc6-540c-4ebe-8dc3-5b0a8d6dc6fd_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_23709fc6-540c-4ebe-8dc3-5b0a8d6dc6fd" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_23709fc6-540c-4ebe-8dc3-5b0a8d6dc6fd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_8c49ffab-573a-4dda-9bf6-de23354c7de7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsByMajorClassAxis_23709fc6-540c-4ebe-8dc3-5b0a8d6dc6fd" xlink:to="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_8c49ffab-573a-4dda-9bf6-de23354c7de7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InProcessResearchAndDevelopmentMember_59a7be7b-85e0-4dfa-84a5-d834c59ad8e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InProcessResearchAndDevelopmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IndefiniteLivedIntangibleAssetsMajorClassNameDomain_8c49ffab-573a-4dda-9bf6-de23354c7de7" xlink:to="loc_us-gaap_InProcessResearchAndDevelopmentMember_59a7be7b-85e0-4dfa-84a5-d834c59ad8e7" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/SupplementalFinancialStatementDataAccumulatedOtherComprehensiveIncomeLossRollForwardDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#SupplementalFinancialStatementDataAccumulatedOtherComprehensiveIncomeLossRollForwardDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/SupplementalFinancialStatementDataAccumulatedOtherComprehensiveIncomeLossRollForwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_6def3a72-6b2f-4ddf-a8d0-7a2d9bedc8ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_AccumulatedOtherComprehensiveIncomeLossRollForward_59385a98-db22-4c6d-919c-62352ec01efe" xlink:href="wdc-20230630.xsd#wdc_AccumulatedOtherComprehensiveIncomeLossRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_6def3a72-6b2f-4ddf-a8d0-7a2d9bedc8ad" xlink:to="loc_wdc_AccumulatedOtherComprehensiveIncomeLossRollForward_59385a98-db22-4c6d-919c-62352ec01efe" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_777ff02c-ec5d-4e5e-95fe-66ddca8fd1d2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_AccumulatedOtherComprehensiveIncomeLossRollForward_59385a98-db22-4c6d-919c-62352ec01efe" xlink:to="loc_us-gaap_StockholdersEquity_777ff02c-ec5d-4e5e-95fe-66ddca8fd1d2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_f80d2517-0898-402d-9d2b-b8fc6338b47b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_AccumulatedOtherComprehensiveIncomeLossRollForward_59385a98-db22-4c6d-919c-62352ec01efe" xlink:to="loc_us-gaap_OciBeforeReclassificationsBeforeTaxAttributableToParent_f80d2517-0898-402d-9d2b-b8fc6338b47b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_2f89710a-a366-4af1-b6b5-ccd7f6ad79c4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_AccumulatedOtherComprehensiveIncomeLossRollForward_59385a98-db22-4c6d-919c-62352ec01efe" xlink:to="loc_us-gaap_ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent_2f89710a-a366-4af1-b6b5-ccd7f6ad79c4" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_33878296-7106-4a62-90c2-1b5e8f994c02" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_AccumulatedOtherComprehensiveIncomeLossRollForward_59385a98-db22-4c6d-919c-62352ec01efe" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossTaxPortionAttributableToParent1_33878296-7106-4a62-90c2-1b5e8f994c02" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_f72a9d46-cc7f-43ac-8d44-7a5705297ac5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_AccumulatedOtherComprehensiveIncomeLossRollForward_59385a98-db22-4c6d-919c-62352ec01efe" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent_f72a9d46-cc7f-43ac-8d44-7a5705297ac5" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockholdersEquity_0d9583bc-0534-4d23-b242-66431ff1e795" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockholdersEquity"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_7c875d0a-850f-45b1-99c0-2da380a1ae86" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeLossTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossLineItems_6def3a72-6b2f-4ddf-a8d0-7a2d9bedc8ad" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_7c875d0a-850f-45b1-99c0-2da380a1ae86" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementEquityComponentsAxis_9eaea56d-d351-4238-aad2-4568f41fcbf7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementEquityComponentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_AccumulatedOtherComprehensiveIncomeLossTable_7c875d0a-850f-45b1-99c0-2da380a1ae86" xlink:to="loc_us-gaap_StatementEquityComponentsAxis_9eaea56d-d351-4238-aad2-4568f41fcbf7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_9eaea56d-d351-4238-aad2-4568f41fcbf7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9eaea56d-d351-4238-aad2-4568f41fcbf7" xlink:to="loc_us-gaap_EquityComponentDomain_9eaea56d-d351-4238-aad2-4568f41fcbf7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityComponentDomain_9975b09a-1c1c-48c4-a85e-b95e674349ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityComponentDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementEquityComponentsAxis_9eaea56d-d351-4238-aad2-4568f41fcbf7" xlink:to="loc_us-gaap_EquityComponentDomain_9975b09a-1c1c-48c4-a85e-b95e674349ec" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_9032c163-13f8-4c39-8b32-9e1be1159df0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_9975b09a-1c1c-48c4-a85e-b95e674349ec" xlink:to="loc_us-gaap_AccumulatedDefinedBenefitPlansAdjustmentNetUnamortizedGainLossMember_9032c163-13f8-4c39-8b32-9e1be1159df0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedTranslationAdjustmentMember_325bc5c8-39c3-4453-97d1-03df27e27efd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedTranslationAdjustmentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_9975b09a-1c1c-48c4-a85e-b95e674349ec" xlink:to="loc_us-gaap_AccumulatedTranslationAdjustmentMember_325bc5c8-39c3-4453-97d1-03df27e27efd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_8fd23540-d30d-4653-8123-9c0b2b18fd27" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_9975b09a-1c1c-48c4-a85e-b95e674349ec" xlink:to="loc_us-gaap_AccumulatedGainLossNetCashFlowHedgeParentMember_8fd23540-d30d-4653-8123-9c0b2b18fd27" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_ad606edd-50f5-49c3-95d4-1971af4efd5a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccumulatedOtherComprehensiveIncomeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityComponentDomain_9975b09a-1c1c-48c4-a85e-b95e674349ec" xlink:to="loc_us-gaap_AccumulatedOtherComprehensiveIncomeMember_ad606edd-50f5-49c3-95d4-1971af4efd5a" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/FairValueMeasurementsandInvestmentsFinancialAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetail" xlink:type="simple" xlink:href="wdc-20230630.xsd#FairValueMeasurementsandInvestmentsFinancialAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetail"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/FairValueMeasurementsandInvestmentsFinancialAssetsandLiabilitiesMeasuredatFairValueonRecurringBasisDetail" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0a1eb2b5-c981-4913-add7-8a8a54d366c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract_564a7e31-ddf9-438a-8a6d-bc832975609b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0a1eb2b5-c981-4913-add7-8a8a54d366c7" xlink:to="loc_us-gaap_AssetsAbstract_564a7e31-ddf9-438a-8a6d-bc832975609b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_9a804041-68d7-49a1-b4e3-c1f889306513" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CashAndCashEquivalentsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_564a7e31-ddf9-438a-8a6d-bc832975609b" xlink:to="loc_us-gaap_CashAndCashEquivalentsFairValueDisclosure_9a804041-68d7-49a1-b4e3-c1f889306513" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeAssets_f7ff3368-81d5-46f7-837f-0bd5db3114d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_564a7e31-ddf9-438a-8a6d-bc832975609b" xlink:to="loc_us-gaap_DerivativeAssets_f7ff3368-81d5-46f7-837f-0bd5db3114d8" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsFairValueDisclosure_400c133c-b21a-455f-9985-bf65b4d694a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract_564a7e31-ddf9-438a-8a6d-bc832975609b" xlink:to="loc_us-gaap_AssetsFairValueDisclosure_400c133c-b21a-455f-9985-bf65b4d694a2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesAbstract_80371b53-d823-4ed0-9b22-33a84836f1e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0a1eb2b5-c981-4913-add7-8a8a54d366c7" xlink:to="loc_us-gaap_LiabilitiesAbstract_80371b53-d823-4ed0-9b22-33a84836f1e5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeLiabilities_6c2fe5f7-cf25-4fb8-a642-b9017e260f48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeLiabilities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_80371b53-d823-4ed0-9b22-33a84836f1e5" xlink:to="loc_us-gaap_DerivativeLiabilities_6c2fe5f7-cf25-4fb8-a642-b9017e260f48" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesFairValueDisclosure_6e583fb2-be86-4a0d-b111-cca8dae74725" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesFairValueDisclosure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesAbstract_80371b53-d823-4ed0-9b22-33a84836f1e5" xlink:to="loc_us-gaap_LiabilitiesFairValueDisclosure_6e583fb2-be86-4a0d-b111-cca8dae74725" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0b460446-2405-4394-b741-95731e997cc0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems_0a1eb2b5-c981-4913-add7-8a8a54d366c7" xlink:to="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0b460446-2405-4394-b741-95731e997cc0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9e64fb80-24e0-4409-9777-6ad7e09e44f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByMeasurementFrequencyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0b460446-2405-4394-b741-95731e997cc0" xlink:to="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9e64fb80-24e0-4409-9777-6ad7e09e44f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_9e64fb80-24e0-4409-9777-6ad7e09e44f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9e64fb80-24e0-4409-9777-6ad7e09e44f3" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_9e64fb80-24e0-4409-9777-6ad7e09e44f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementFrequencyDomain_5d3ee7f0-d01a-4ac5-a066-335408d777be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementFrequencyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementFrequencyAxis_9e64fb80-24e0-4409-9777-6ad7e09e44f3" xlink:to="loc_us-gaap_FairValueMeasurementFrequencyDomain_5d3ee7f0-d01a-4ac5-a066-335408d777be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsRecurringMember_1f6e5d0f-c6c8-4395-b762-27341b4bec7d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsRecurringMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementFrequencyDomain_5d3ee7f0-d01a-4ac5-a066-335408d777be" xlink:to="loc_us-gaap_FairValueMeasurementsRecurringMember_1f6e5d0f-c6c8-4395-b762-27341b4bec7d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByAssetClassAxis_578cd40b-ce6b-4eab-bb85-a6ca8c67d5d5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByAssetClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0b460446-2405-4394-b741-95731e997cc0" xlink:to="loc_us-gaap_FairValueByAssetClassAxis_578cd40b-ce6b-4eab-bb85-a6ca8c67d5d5" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_578cd40b-ce6b-4eab-bb85-a6ca8c67d5d5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_578cd40b-ce6b-4eab-bb85-a6ca8c67d5d5" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_578cd40b-ce6b-4eab-bb85-a6ca8c67d5d5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2ad09b10-f967-4d30-bd98-3f9ac3e8a490" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByAssetClassAxis_578cd40b-ce6b-4eab-bb85-a6ca8c67d5d5" xlink:to="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2ad09b10-f967-4d30-bd98-3f9ac3e8a490" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_MoneyMarketFundsMember_7609027e-697f-4fb3-a8c6-6dae0a9dfb14" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_MoneyMarketFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2ad09b10-f967-4d30-bd98-3f9ac3e8a490" xlink:to="loc_us-gaap_MoneyMarketFundsMember_7609027e-697f-4fb3-a8c6-6dae0a9dfb14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_ff81a57d-06e8-42a4-9518-7d0a9c16fa52" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2ad09b10-f967-4d30-bd98-3f9ac3e8a490" xlink:to="loc_us-gaap_ForeignExchangeContractMember_ff81a57d-06e8-42a4-9518-7d0a9c16fa52" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InterestRateSwapMember_d4b46f2f-20c3-411c-b9f0-0bed92c4f0dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InterestRateSwapMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueAssetsMeasuredOnRecurringBasisUnobservableInputReconciliationByAssetClassDomain_2ad09b10-f967-4d30-bd98-3f9ac3e8a490" xlink:to="loc_us-gaap_InterestRateSwapMember_d4b46f2f-20c3-411c-b9f0-0bed92c4f0dd" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByLiabilityClassAxis_36fad92b-4eb1-4fbb-b07f-3e84cbd7849d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByLiabilityClassAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0b460446-2405-4394-b741-95731e997cc0" xlink:to="loc_us-gaap_FairValueByLiabilityClassAxis_36fad92b-4eb1-4fbb-b07f-3e84cbd7849d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_36fad92b-4eb1-4fbb-b07f-3e84cbd7849d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_36fad92b-4eb1-4fbb-b07f-3e84cbd7849d" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_36fad92b-4eb1-4fbb-b07f-3e84cbd7849d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_3ba94f42-4097-4aa4-80fb-d5abac9511a8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByLiabilityClassAxis_36fad92b-4eb1-4fbb-b07f-3e84cbd7849d" xlink:to="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_3ba94f42-4097-4aa4-80fb-d5abac9511a8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignExchangeContractMember_26e3a2f5-e3a9-4c76-8441-a561935d2fff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignExchangeContractMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationByLiabilityClassDomain_3ba94f42-4097-4aa4-80fb-d5abac9511a8" xlink:to="loc_us-gaap_ForeignExchangeContractMember_26e3a2f5-e3a9-4c76-8441-a561935d2fff" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f1644e13-ea35-44ae-8fbb-c97c1e597657" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisTable_0b460446-2405-4394-b741-95731e997cc0" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f1644e13-ea35-44ae-8fbb-c97c1e597657" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f1644e13-ea35-44ae-8fbb-c97c1e597657_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f1644e13-ea35-44ae-8fbb-c97c1e597657" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f1644e13-ea35-44ae-8fbb-c97c1e597657_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ada8a46f-7d16-41f1-b3cb-62cccca7e297" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f1644e13-ea35-44ae-8fbb-c97c1e597657" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ada8a46f-7d16-41f1-b3cb-62cccca7e297" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_175e6c32-f2b4-452c-a1bf-4d9a35ef5711" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ada8a46f-7d16-41f1-b3cb-62cccca7e297" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_175e6c32-f2b4-452c-a1bf-4d9a35ef5711" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_d1645345-d97c-4c08-9e14-903eeb13dec3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ada8a46f-7d16-41f1-b3cb-62cccca7e297" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_d1645345-d97c-4c08-9e14-903eeb13dec3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_187c92ea-1dbb-4de4-b0fc-eeba0e76a99b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_ada8a46f-7d16-41f1-b3cb-62cccca7e297" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_187c92ea-1dbb-4de4-b0fc-eeba0e76a99b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/FairValueMeasurementsandInvestmentsDebtInstrumentFairValueDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#FairValueMeasurementsandInvestmentsDebtInstrumentFairValueDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/FairValueMeasurementsandInvestmentsDebtInstrumentFairValueDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_6d54038b-8158-4856-a96d-207a7341d278" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a43aaaeb-8802-4c26-a327-fdd02300940e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6d54038b-8158-4856-a96d-207a7341d278" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_a43aaaeb-8802-4c26-a327-fdd02300940e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtFairValue_8bc685c1-0582-4bdb-8a80-ebf64c0e89c0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6d54038b-8158-4856-a96d-207a7341d278" xlink:to="loc_us-gaap_LongTermDebtFairValue_8bc685c1-0582-4bdb-8a80-ebf64c0e89c0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_38774814-6477-4864-92bb-264ac513b177" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_6d54038b-8158-4856-a96d-207a7341d278" xlink:to="loc_us-gaap_DebtInstrumentTable_38774814-6477-4864-92bb-264ac513b177" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e901bd11-f376-4538-966e-941a2722e434" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_38774814-6477-4864-92bb-264ac513b177" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e901bd11-f376-4538-966e-941a2722e434" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e901bd11-f376-4538-966e-941a2722e434_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e901bd11-f376-4538-966e-941a2722e434" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_e901bd11-f376-4538-966e-941a2722e434_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_43440f86-b5b8-4e98-b781-e99bcf6e8dfc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_e901bd11-f376-4538-966e-941a2722e434" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_43440f86-b5b8-4e98-b781-e99bcf6e8dfc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_cf3040b5-02f7-4825-840f-6ab0c23e30b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_43440f86-b5b8-4e98-b781-e99bcf6e8dfc" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_cf3040b5-02f7-4825-840f-6ab0c23e30b2" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByMeasurementBasisAxis_368658ec-ecc1-4229-afcc-b93a62beb415" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByMeasurementBasisAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_38774814-6477-4864-92bb-264ac513b177" xlink:to="loc_us-gaap_FairValueByMeasurementBasisAxis_368658ec-ecc1-4229-afcc-b93a62beb415" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_368658ec-ecc1-4229-afcc-b93a62beb415_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_368658ec-ecc1-4229-afcc-b93a62beb415" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_368658ec-ecc1-4229-afcc-b93a62beb415_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueDisclosureItemAmountsDomain_1f889774-0814-4fb1-a922-2a1b72a4df3d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueDisclosureItemAmountsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByMeasurementBasisAxis_368658ec-ecc1-4229-afcc-b93a62beb415" xlink:to="loc_us-gaap_FairValueDisclosureItemAmountsDomain_1f889774-0814-4fb1-a922-2a1b72a4df3d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_04468eae-4c17-4e04-95ab-e881799c611c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PortionAtFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueDisclosureItemAmountsDomain_1f889774-0814-4fb1-a922-2a1b72a4df3d" xlink:to="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_04468eae-4c17-4e04-95ab-e881799c611c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_cc108087-cc1d-4764-ac4c-c2e2bf7ab495" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CarryingReportedAmountFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_04468eae-4c17-4e04-95ab-e881799c611c" xlink:to="loc_us-gaap_CarryingReportedAmountFairValueDisclosureMember_cc108087-cc1d-4764-ac4c-c2e2bf7ab495" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_a5271668-0878-4470-a2d1-a31f3b071c65" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EstimateOfFairValueFairValueDisclosureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PortionAtFairValueFairValueDisclosureMember_04468eae-4c17-4e04-95ab-e881799c611c" xlink:to="loc_us-gaap_EstimateOfFairValueFairValueDisclosureMember_a5271668-0878-4470-a2d1-a31f3b071c65" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_b35ece89-7be3-491d-80fb-c760d0529695" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_38774814-6477-4864-92bb-264ac513b177" xlink:to="loc_us-gaap_DebtInstrumentAxis_b35ece89-7be3-491d-80fb-c760d0529695" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_b35ece89-7be3-491d-80fb-c760d0529695_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_b35ece89-7be3-491d-80fb-c760d0529695" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_b35ece89-7be3-491d-80fb-c760d0529695_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_48cf2b9a-c745-4cf7-91ab-7e98b8f46c63" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_b35ece89-7be3-491d-80fb-c760d0529695" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_48cf2b9a-c745-4cf7-91ab-7e98b8f46c63" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember_cfe8cf6c-5e6f-4539-92a8-edb655e2c901" xlink:href="wdc-20230630.xsd#wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_48cf2b9a-c745-4cf7-91ab-7e98b8f46c63" xlink:to="loc_wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember_cfe8cf6c-5e6f-4539-92a8-edb655e2c901" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_FourPointSeventyFivePercentSeniorUnsecuredNotesDueTwoThousandTwentySixMember_44be6c7b-8760-432e-95a1-f721fa45550a" xlink:href="wdc-20230630.xsd#wdc_FourPointSeventyFivePercentSeniorUnsecuredNotesDueTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_48cf2b9a-c745-4cf7-91ab-7e98b8f46c63" xlink:to="loc_wdc_FourPointSeventyFivePercentSeniorUnsecuredNotesDueTwoThousandTwentySixMember_44be6c7b-8760-432e-95a1-f721fa45550a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TermLoanA2Member_1c4ac437-47b0-4b64-afec-6c36934da734" xlink:href="wdc-20230630.xsd#wdc_TermLoanA2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_48cf2b9a-c745-4cf7-91ab-7e98b8f46c63" xlink:to="loc_wdc_TermLoanA2Member_1c4ac437-47b0-4b64-afec-6c36934da734" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TwoPointEightyFivePercentSeniorNotesDueTwoThousandTwentyNineMember_25eb846c-94aa-4add-b057-97f1a28830f1" xlink:href="wdc-20230630.xsd#wdc_TwoPointEightyFivePercentSeniorNotesDueTwoThousandTwentyNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_48cf2b9a-c745-4cf7-91ab-7e98b8f46c63" xlink:to="loc_wdc_TwoPointEightyFivePercentSeniorNotesDueTwoThousandTwentyNineMember_25eb846c-94aa-4add-b057-97f1a28830f1" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ThreePointTenPercentSeniorNotesDueTwoThousandThirtyTwoMember_68286188-8b15-487c-9153-93814a6d4794" xlink:href="wdc-20230630.xsd#wdc_ThreePointTenPercentSeniorNotesDueTwoThousandThirtyTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_48cf2b9a-c745-4cf7-91ab-7e98b8f46c63" xlink:to="loc_wdc_ThreePointTenPercentSeniorNotesDueTwoThousandThirtyTwoMember_68286188-8b15-487c-9153-93814a6d4794" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_b66d5e89-d886-4ab9-8dfd-d1ee1be29914" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_38774814-6477-4864-92bb-264ac513b177" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_b66d5e89-d886-4ab9-8dfd-d1ee1be29914" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_b66d5e89-d886-4ab9-8dfd-d1ee1be29914_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b66d5e89-d886-4ab9-8dfd-d1ee1be29914" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_b66d5e89-d886-4ab9-8dfd-d1ee1be29914_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_1285c987-fb7e-4b84-b827-30dd0de655ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_b66d5e89-d886-4ab9-8dfd-d1ee1be29914" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_1285c987-fb7e-4b84-b827-30dd0de655ea" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_b1487099-ee9e-4d0e-9f9a-a1198a99096a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_1285c987-fb7e-4b84-b827-30dd0de655ea" xlink:to="loc_us-gaap_ConvertibleDebtMember_b1487099-ee9e-4d0e-9f9a-a1198a99096a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/DerivativeInstrumentsandHedgingActivitiesAdditionalInformationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#DerivativeInstrumentsandHedgingActivitiesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/DerivativeInstrumentsandHedgingActivitiesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3a8f4842-d5f3-4256-95b4-97e27fa87f81" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsGainLossLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeTermOfContract_743894c0-5155-445a-97a1-13a907dc7710" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeTermOfContract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3a8f4842-d5f3-4256-95b4-97e27fa87f81" xlink:to="loc_us-gaap_DerivativeTermOfContract_743894c0-5155-445a-97a1-13a907dc7710" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b71e42a7-d6be-4252-8090-3a40b2df587c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossLineItems_3a8f4842-d5f3-4256-95b4-97e27fa87f81" xlink:to="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b71e42a7-d6be-4252-8090-3a40b2df587c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeInstrumentRiskAxis_afca3202-1e55-4176-bff9-fb6da30e542f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeInstrumentRiskAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipByIncomeStatementLocationByDerivativeInstrumentRiskTable_b71e42a7-d6be-4252-8090-3a40b2df587c" xlink:to="loc_us-gaap_DerivativeInstrumentRiskAxis_afca3202-1e55-4176-bff9-fb6da30e542f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_afca3202-1e55-4176-bff9-fb6da30e542f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_afca3202-1e55-4176-bff9-fb6da30e542f" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_afca3202-1e55-4176-bff9-fb6da30e542f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DerivativeContractTypeDomain_3c33c718-50e4-4123-a183-76193fdfc183" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DerivativeContractTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DerivativeInstrumentRiskAxis_afca3202-1e55-4176-bff9-fb6da30e542f" xlink:to="loc_us-gaap_DerivativeContractTypeDomain_3c33c718-50e4-4123-a183-76193fdfc183" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ForeignExchangeForwardContractsDesignatedMember_0ba60fe1-6962-4e99-bc98-c65ba0a6536a" xlink:href="wdc-20230630.xsd#wdc_ForeignExchangeForwardContractsDesignatedMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DerivativeContractTypeDomain_3c33c718-50e4-4123-a183-76193fdfc183" xlink:to="loc_wdc_ForeignExchangeForwardContractsDesignatedMember_0ba60fe1-6962-4e99-bc98-c65ba0a6536a" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/DebtScheduleofDebtDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#DebtScheduleofDebtDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/DebtScheduleofDebtDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_7d4b431c-d574-4cdd-9112-c9adbfa03097" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_30e3374f-b789-4147-8c04-754c125af80d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d4b431c-d574-4cdd-9112-c9adbfa03097" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_30e3374f-b789-4147-8c04-754c125af80d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentCarryingAmount_81c9fd5e-f5e6-41e2-8701-9eeb28ee4116" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentCarryingAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d4b431c-d574-4cdd-9112-c9adbfa03097" xlink:to="loc_us-gaap_DebtInstrumentCarryingAmount_81c9fd5e-f5e6-41e2-8701-9eeb28ee4116" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_9962da6a-6eb8-49d8-9c8c-0f75372e5c7d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d4b431c-d574-4cdd-9112-c9adbfa03097" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_9962da6a-6eb8-49d8-9c8c-0f75372e5c7d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebt_1fd52eec-2e0c-43a2-b42e-3427180a4c6f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d4b431c-d574-4cdd-9112-c9adbfa03097" xlink:to="loc_us-gaap_LongTermDebt_1fd52eec-2e0c-43a2-b42e-3427180a4c6f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtCurrent_63b7be8b-b50f-4f7e-b44e-ec155726c5f4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d4b431c-d574-4cdd-9112-c9adbfa03097" xlink:to="loc_us-gaap_LongTermDebtCurrent_63b7be8b-b50f-4f7e-b44e-ec155726c5f4" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongTermDebtNoncurrent_9fae5fe6-42a4-48cb-87e7-d19ae6384ef8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongTermDebtNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d4b431c-d574-4cdd-9112-c9adbfa03097" xlink:to="loc_us-gaap_LongTermDebtNoncurrent_9fae5fe6-42a4-48cb-87e7-d19ae6384ef8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_e8fa50ed-62b4-4089-b31e-dce1c6c35c2c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_7d4b431c-d574-4cdd-9112-c9adbfa03097" xlink:to="loc_us-gaap_DebtInstrumentTable_e8fa50ed-62b4-4089-b31e-dce1c6c35c2c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_268b44ee-1b68-4449-98cd-43b828f05bfb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e8fa50ed-62b4-4089-b31e-dce1c6c35c2c" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_268b44ee-1b68-4449-98cd-43b828f05bfb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_268b44ee-1b68-4449-98cd-43b828f05bfb_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_268b44ee-1b68-4449-98cd-43b828f05bfb" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_268b44ee-1b68-4449-98cd-43b828f05bfb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_22a0e7b1-51d6-48a8-9bf4-5ae661bb669f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_268b44ee-1b68-4449-98cd-43b828f05bfb" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_22a0e7b1-51d6-48a8-9bf4-5ae661bb669f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_b2e8e9da-7ff6-4049-9a4c-88cc9bbc55d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_22a0e7b1-51d6-48a8-9bf4-5ae661bb669f" xlink:to="loc_us-gaap_ConvertibleDebtMember_b2e8e9da-7ff6-4049-9a4c-88cc9bbc55d3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_cbf63146-2219-4177-a326-477b4a94007c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_e8fa50ed-62b4-4089-b31e-dce1c6c35c2c" xlink:to="loc_us-gaap_DebtInstrumentAxis_cbf63146-2219-4177-a326-477b4a94007c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_cbf63146-2219-4177-a326-477b4a94007c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_cbf63146-2219-4177-a326-477b4a94007c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_cbf63146-2219-4177-a326-477b4a94007c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_79d458d5-f33d-4a20-b471-c2414633a24b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_cbf63146-2219-4177-a326-477b4a94007c" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_79d458d5-f33d-4a20-b471-c2414633a24b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember_b780bc2d-0f48-4e67-b3e6-8ccb78b03746" xlink:href="wdc-20230630.xsd#wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_79d458d5-f33d-4a20-b471-c2414633a24b" xlink:to="loc_wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember_b780bc2d-0f48-4e67-b3e6-8ccb78b03746" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_FourPointSeventyFivePercentSeniorUnsecuredNotesDueTwoThousandTwentySixMember_7c6a4d4c-7049-485b-abaa-73feca4dd276" xlink:href="wdc-20230630.xsd#wdc_FourPointSeventyFivePercentSeniorUnsecuredNotesDueTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_79d458d5-f33d-4a20-b471-c2414633a24b" xlink:to="loc_wdc_FourPointSeventyFivePercentSeniorUnsecuredNotesDueTwoThousandTwentySixMember_7c6a4d4c-7049-485b-abaa-73feca4dd276" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TermLoanA2Member_0f6fbcea-5d97-459b-9d4f-c240b9b80004" xlink:href="wdc-20230630.xsd#wdc_TermLoanA2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_79d458d5-f33d-4a20-b471-c2414633a24b" xlink:to="loc_wdc_TermLoanA2Member_0f6fbcea-5d97-459b-9d4f-c240b9b80004" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TwoPointEightyFivePercentSeniorNotesDueTwoThousandTwentyNineMember_82497e58-56a5-4e41-a739-6155a1df8b32" xlink:href="wdc-20230630.xsd#wdc_TwoPointEightyFivePercentSeniorNotesDueTwoThousandTwentyNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_79d458d5-f33d-4a20-b471-c2414633a24b" xlink:to="loc_wdc_TwoPointEightyFivePercentSeniorNotesDueTwoThousandTwentyNineMember_82497e58-56a5-4e41-a739-6155a1df8b32" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ThreePointTenPercentSeniorNotesDueTwoThousandThirtyTwoMember_dde69b56-e1c0-4065-9528-d8d63db82ad5" xlink:href="wdc-20230630.xsd#wdc_ThreePointTenPercentSeniorNotesDueTwoThousandThirtyTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_79d458d5-f33d-4a20-b471-c2414633a24b" xlink:to="loc_wdc_ThreePointTenPercentSeniorNotesDueTwoThousandThirtyTwoMember_dde69b56-e1c0-4065-9528-d8d63db82ad5" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/DebtAdditionalInformationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#DebtAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/DebtAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantCashAndCashEquivalentsPlusAvailableUnusedCapacityAmount_b627bda0-6c7a-46bb-a0c2-2b8e0701800b" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantCashAndCashEquivalentsPlusAvailableUnusedCapacityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_wdc_DebtInstrumentCovenantCashAndCashEquivalentsPlusAvailableUnusedCapacityAmount_b627bda0-6c7a-46bb-a0c2-2b8e0701800b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantMinimumLiquidityAmount_33ab52bd-a1a2-4929-a18a-c4a503d41fbe" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantMinimumLiquidityAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_wdc_DebtInstrumentCovenantMinimumLiquidityAmount_33ab52bd-a1a2-4929-a18a-c4a503d41fbe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentFreeCashFlowAmount_fd50cd28-1346-466a-b90d-c8b308eda2ba" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentFreeCashFlowAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_wdc_DebtInstrumentFreeCashFlowAmount_fd50cd28-1346-466a-b90d-c8b308eda2ba" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_3595da13-9ccd-4ea8-a848-71c89ea6995d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentBasisSpreadOnVariableRate1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_DebtInstrumentBasisSpreadOnVariableRate1_3595da13-9ccd-4ea8-a848-71c89ea6995d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLongTermDebt_b1c9a84e-4e56-4038-9d6d-f6eeb58c048c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfLongTermDebt"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_RepaymentsOfLongTermDebt_b1c9a84e-4e56-4038-9d6d-f6eeb58c048c" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentFaceAmount_663d49e4-0153-48b0-9973-0d5ea664f640" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentFaceAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_DebtInstrumentFaceAmount_663d49e4-0153-48b0-9973-0d5ea664f640" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_61b952fd-c6be-449f-887e-c3e0964f288d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_61b952fd-c6be-449f-887e-c3e0964f288d" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_6456dc81-731e-4ebd-81b8-50801caba4e5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentPeriodicPaymentPrincipal"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_DebtInstrumentPeriodicPaymentPrincipal_6456dc81-731e-4ebd-81b8-50801caba4e5" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnamortizedDebtIssuanceExpense_06ece666-71c9-4845-8460-ae3c11427687" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnamortizedDebtIssuanceExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_UnamortizedDebtIssuanceExpense_06ece666-71c9-4845-8460-ae3c11427687" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RepaymentsOfLinesOfCredit_afa5133a-8d4b-4909-b8e2-04e39a83b210" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RepaymentsOfLinesOfCredit"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_RepaymentsOfLinesOfCredit_afa5133a-8d4b-4909-b8e2-04e39a83b210" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_249b506b-7edf-461c-a93d-751586b1f1da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityCommitmentFeePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_LineOfCreditFacilityCommitmentFeePercentage_249b506b-7edf-461c-a93d-751586b1f1da" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1db893f5-cfc2-4ea7-9594-b8401930cbc7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity_1db893f5-cfc2-4ea7-9594-b8401930cbc7" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_23f86ebf-eb9f-4c87-8245-e4194bbf95ff" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentConvertibleConversionPrice1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_DebtInstrumentConvertibleConversionPrice1_23f86ebf-eb9f-4c87-8245-e4194bbf95ff" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_0e47b3c9-0961-4c7d-844b-974636d07093" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_DebtInstrumentUnamortizedDiscountPremiumAndDebtIssuanceCostsNet_0e47b3c9-0961-4c7d-844b-974636d07093" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DeferredFinanceCostsNet_7efa795d-5269-4f6a-985a-5f5fc913d59b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DeferredFinanceCostsNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_DeferredFinanceCostsNet_7efa795d-5269-4f6a-985a-5f5fc913d59b" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_9a39574d-7687-4cdb-9eae-5406767aaad5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_fdc1e02e-e84c-42cb-9505-1a37c38c0aed" xlink:to="loc_us-gaap_DebtInstrumentTable_9a39574d-7687-4cdb-9eae-5406767aaad5" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_7c84e71c-6ef3-4a71-b83c-a57eaae7b559" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9a39574d-7687-4cdb-9eae-5406767aaad5" xlink:to="loc_us-gaap_DebtInstrumentAxis_7c84e71c-6ef3-4a71-b83c-a57eaae7b559" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_7c84e71c-6ef3-4a71-b83c-a57eaae7b559_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_7c84e71c-6ef3-4a71-b83c-a57eaae7b559" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_7c84e71c-6ef3-4a71-b83c-a57eaae7b559_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3a8c656b-5989-4c31-9f2d-9d1a756793d8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_7c84e71c-6ef3-4a71-b83c-a57eaae7b559" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3a8c656b-5989-4c31-9f2d-9d1a756793d8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_RevolvingCreditFacility2027Member_fb4d7084-d5bb-4446-a540-b0d93578c452" xlink:href="wdc-20230630.xsd#wdc_RevolvingCreditFacility2027Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3a8c656b-5989-4c31-9f2d-9d1a756793d8" xlink:to="loc_wdc_RevolvingCreditFacility2027Member_fb4d7084-d5bb-4446-a540-b0d93578c452" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TermLoanA2Member_00a76e54-3d32-4d2c-8dea-4efd67d9dbf1" xlink:href="wdc-20230630.xsd#wdc_TermLoanA2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3a8c656b-5989-4c31-9f2d-9d1a756793d8" xlink:to="loc_wdc_TermLoanA2Member_00a76e54-3d32-4d2c-8dea-4efd67d9dbf1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DelayedDrawTermLoanAgreementMember_6ddf2689-b7dd-4eaf-bade-ce879d71fb47" xlink:href="wdc-20230630.xsd#wdc_DelayedDrawTermLoanAgreementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3a8c656b-5989-4c31-9f2d-9d1a756793d8" xlink:to="loc_wdc_DelayedDrawTermLoanAgreementMember_6ddf2689-b7dd-4eaf-bade-ce879d71fb47" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TwoPointEightyFivePercentSeniorNotesDueTwoThousandTwentyNineMember_1a758333-7d9e-4a00-853f-e035094c371c" xlink:href="wdc-20230630.xsd#wdc_TwoPointEightyFivePercentSeniorNotesDueTwoThousandTwentyNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3a8c656b-5989-4c31-9f2d-9d1a756793d8" xlink:to="loc_wdc_TwoPointEightyFivePercentSeniorNotesDueTwoThousandTwentyNineMember_1a758333-7d9e-4a00-853f-e035094c371c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ThreePointHundredPercentSeniorUnsecuredNotesDueTwoThousandThirtyTwoMember_c2911119-4779-48f4-9429-29798d3aafe5" xlink:href="wdc-20230630.xsd#wdc_ThreePointHundredPercentSeniorUnsecuredNotesDueTwoThousandThirtyTwoMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3a8c656b-5989-4c31-9f2d-9d1a756793d8" xlink:to="loc_wdc_ThreePointHundredPercentSeniorUnsecuredNotesDueTwoThousandThirtyTwoMember_c2911119-4779-48f4-9429-29798d3aafe5" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember_d3c11396-41ce-48b8-bfe0-26481de1535f" xlink:href="wdc-20230630.xsd#wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3a8c656b-5989-4c31-9f2d-9d1a756793d8" xlink:to="loc_wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember_d3c11396-41ce-48b8-bfe0-26481de1535f" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_FourPointSeventyFivePercentSeniorUnsecuredNotesDueTwoThousandTwentySixMember_43b30866-6ab9-4385-8c3f-94f1162cbcb6" xlink:href="wdc-20230630.xsd#wdc_FourPointSeventyFivePercentSeniorUnsecuredNotesDueTwoThousandTwentySixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_3a8c656b-5989-4c31-9f2d-9d1a756793d8" xlink:to="loc_wdc_FourPointSeventyFivePercentSeniorUnsecuredNotesDueTwoThousandTwentySixMember_43b30866-6ab9-4385-8c3f-94f1162cbcb6" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_72a5410b-ae7d-4c28-a5a2-c1c0c279d744" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9a39574d-7687-4cdb-9eae-5406767aaad5" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_72a5410b-ae7d-4c28-a5a2-c1c0c279d744" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_72a5410b-ae7d-4c28-a5a2-c1c0c279d744_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_72a5410b-ae7d-4c28-a5a2-c1c0c279d744" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_72a5410b-ae7d-4c28-a5a2-c1c0c279d744_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_cc254d60-0964-431a-aa94-6541ecb75412" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_72a5410b-ae7d-4c28-a5a2-c1c0c279d744" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_cc254d60-0964-431a-aa94-6541ecb75412" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_89056907-3781-408e-b9df-488ef8cc7664" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_cc254d60-0964-431a-aa94-6541ecb75412" xlink:to="loc_us-gaap_ConvertibleDebtMember_89056907-3781-408e-b9df-488ef8cc7664" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeniorNotesMember_3a805350-c83b-4ac2-be9f-c0c327d3dac9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeniorNotesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_cc254d60-0964-431a-aa94-6541ecb75412" xlink:to="loc_us-gaap_SeniorNotesMember_3a805350-c83b-4ac2-be9f-c0c327d3dac9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_3c065d68-55a7-4f7a-ad04-48db180e5ee0" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9a39574d-7687-4cdb-9eae-5406767aaad5" xlink:to="loc_srt_StatementScenarioAxis_3c065d68-55a7-4f7a-ad04-48db180e5ee0" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_3c065d68-55a7-4f7a-ad04-48db180e5ee0_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_3c065d68-55a7-4f7a-ad04-48db180e5ee0" xlink:to="loc_srt_ScenarioUnspecifiedDomain_3c065d68-55a7-4f7a-ad04-48db180e5ee0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_5a776692-3fbb-4b93-91bc-93c42a72cb17" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_3c065d68-55a7-4f7a-ad04-48db180e5ee0" xlink:to="loc_srt_ScenarioUnspecifiedDomain_5a776692-3fbb-4b93-91bc-93c42a72cb17" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_dcab5f7a-834f-428d-9e2f-c8cf9cb856ee" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_5a776692-3fbb-4b93-91bc-93c42a72cb17" xlink:to="loc_srt_ScenarioForecastMember_dcab5f7a-834f-428d-9e2f-c8cf9cb856ee" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_d938e8a6-bf99-47f9-a45b-9d110ac80db7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9a39574d-7687-4cdb-9eae-5406767aaad5" xlink:to="loc_us-gaap_CreditFacilityAxis_d938e8a6-bf99-47f9-a45b-9d110ac80db7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_d938e8a6-bf99-47f9-a45b-9d110ac80db7_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_d938e8a6-bf99-47f9-a45b-9d110ac80db7" xlink:to="loc_us-gaap_CreditFacilityDomain_d938e8a6-bf99-47f9-a45b-9d110ac80db7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_ab223ec6-cd4a-4db3-98db-44ed26ec63be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_d938e8a6-bf99-47f9-a45b-9d110ac80db7" xlink:to="loc_us-gaap_CreditFacilityDomain_ab223ec6-cd4a-4db3-98db-44ed26ec63be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_22cf8093-2579-4001-91de-628627744aa5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_ab223ec6-cd4a-4db3-98db-44ed26ec63be" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_22cf8093-2579-4001-91de-628627744aa5" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeAxis_e5ef0157-a6f0-4a4c-ad70-eee46300e572" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShortTermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9a39574d-7687-4cdb-9eae-5406767aaad5" xlink:to="loc_us-gaap_ShortTermDebtTypeAxis_e5ef0157-a6f0-4a4c-ad70-eee46300e572" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_e5ef0157-a6f0-4a4c-ad70-eee46300e572_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_e5ef0157-a6f0-4a4c-ad70-eee46300e572" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_e5ef0157-a6f0-4a4c-ad70-eee46300e572_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShortTermDebtTypeDomain_0230ae7b-8aa0-4a40-9c60-89c7574a4188" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShortTermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShortTermDebtTypeAxis_e5ef0157-a6f0-4a4c-ad70-eee46300e572" xlink:to="loc_us-gaap_ShortTermDebtTypeDomain_0230ae7b-8aa0-4a40-9c60-89c7574a4188" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LineOfCreditMember_4e40a7e0-97f5-4e2b-a030-02dddc506997" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LineOfCreditMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShortTermDebtTypeDomain_0230ae7b-8aa0-4a40-9c60-89c7574a4188" xlink:to="loc_us-gaap_LineOfCreditMember_4e40a7e0-97f5-4e2b-a030-02dddc506997" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateAxis_36a67a0c-af8e-4af9-a615-32033e72b58b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9a39574d-7687-4cdb-9eae-5406767aaad5" xlink:to="loc_us-gaap_VariableRateAxis_36a67a0c-af8e-4af9-a615-32033e72b58b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_36a67a0c-af8e-4af9-a615-32033e72b58b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_VariableRateAxis_36a67a0c-af8e-4af9-a615-32033e72b58b" xlink:to="loc_us-gaap_VariableRateDomain_36a67a0c-af8e-4af9-a615-32033e72b58b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableRateDomain_0f974b58-1c15-414d-b87f-0ba486611f22" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableRateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_VariableRateAxis_36a67a0c-af8e-4af9-a615-32033e72b58b" xlink:to="loc_us-gaap_VariableRateDomain_0f974b58-1c15-414d-b87f-0ba486611f22" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_696da6ca-590e-4f77-8488-1dc66c8d77ad" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_0f974b58-1c15-414d-b87f-0ba486611f22" xlink:to="loc_us-gaap_SecuredOvernightFinancingRateSofrOvernightIndexSwapRateMember_696da6ca-590e-4f77-8488-1dc66c8d77ad" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BaseRateMember_eddde2bc-1233-4ce6-9ab5-b61be62e7ab8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BaseRateMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_VariableRateDomain_0f974b58-1c15-414d-b87f-0ba486611f22" xlink:to="loc_us-gaap_BaseRateMember_eddde2bc-1233-4ce6-9ab5-b61be62e7ab8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_eff35a19-533e-4b41-84bb-1f6bbce05978" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9a39574d-7687-4cdb-9eae-5406767aaad5" xlink:to="loc_srt_RangeAxis_eff35a19-533e-4b41-84bb-1f6bbce05978" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_eff35a19-533e-4b41-84bb-1f6bbce05978_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_eff35a19-533e-4b41-84bb-1f6bbce05978" xlink:to="loc_srt_RangeMember_eff35a19-533e-4b41-84bb-1f6bbce05978_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_924bb794-fcb4-418e-a3c1-bcd09bd80003" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_eff35a19-533e-4b41-84bb-1f6bbce05978" xlink:to="loc_srt_RangeMember_924bb794-fcb4-418e-a3c1-bcd09bd80003" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_6ba54d1e-a0fc-4bc2-bdc4-0545d1277f14" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_924bb794-fcb4-418e-a3c1-bcd09bd80003" xlink:to="loc_srt_MinimumMember_6ba54d1e-a0fc-4bc2-bdc4-0545d1277f14" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_1a05c8a0-ea45-4d23-8f61-b698a51d3568" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_924bb794-fcb4-418e-a3c1-bcd09bd80003" xlink:to="loc_srt_MaximumMember_1a05c8a0-ea45-4d23-8f61-b698a51d3568" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_MaturityPeriodAxis_f610f016-3da1-40ce-a3e9-84dc6cf562eb" xlink:href="wdc-20230630.xsd#wdc_MaturityPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9a39574d-7687-4cdb-9eae-5406767aaad5" xlink:to="loc_wdc_MaturityPeriodAxis_f610f016-3da1-40ce-a3e9-84dc6cf562eb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_MaturityPeriodDomain_f610f016-3da1-40ce-a3e9-84dc6cf562eb_default" xlink:href="wdc-20230630.xsd#wdc_MaturityPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wdc_MaturityPeriodAxis_f610f016-3da1-40ce-a3e9-84dc6cf562eb" xlink:to="loc_wdc_MaturityPeriodDomain_f610f016-3da1-40ce-a3e9-84dc6cf562eb_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_MaturityPeriodDomain_60136d3f-5dd9-4ec9-831a-ea6a8afb453f" xlink:href="wdc-20230630.xsd#wdc_MaturityPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wdc_MaturityPeriodAxis_f610f016-3da1-40ce-a3e9-84dc6cf562eb" xlink:to="loc_wdc_MaturityPeriodDomain_60136d3f-5dd9-4ec9-831a-ea6a8afb453f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_July12022ThroughJune302023Member_b048b81a-c881-496f-8b44-eae45113c2c1" xlink:href="wdc-20230630.xsd#wdc_July12022ThroughJune302023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_MaturityPeriodDomain_60136d3f-5dd9-4ec9-831a-ea6a8afb453f" xlink:to="loc_wdc_July12022ThroughJune302023Member_b048b81a-c881-496f-8b44-eae45113c2c1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeAxis_e94b0662-67bb-4bb2-b9fd-c31fed023506" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_9a39574d-7687-4cdb-9eae-5406767aaad5" xlink:to="loc_us-gaap_SubsequentEventTypeAxis_e94b0662-67bb-4bb2-b9fd-c31fed023506" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_e94b0662-67bb-4bb2-b9fd-c31fed023506_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_e94b0662-67bb-4bb2-b9fd-c31fed023506" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_e94b0662-67bb-4bb2-b9fd-c31fed023506_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventTypeDomain_0972c188-6618-4ca9-bfb8-688dedf287d0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsequentEventTypeAxis_e94b0662-67bb-4bb2-b9fd-c31fed023506" xlink:to="loc_us-gaap_SubsequentEventTypeDomain_0972c188-6618-4ca9-bfb8-688dedf287d0" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsequentEventMember_f64a0151-9a86-4833-a4d9-af7ecaf3f3b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsequentEventMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SubsequentEventTypeDomain_0972c188-6618-4ca9-bfb8-688dedf287d0" xlink:to="loc_us-gaap_SubsequentEventMember_f64a0151-9a86-4833-a4d9-af7ecaf3f3b8" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/DebtScheduleofLeverageRatiosDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#DebtScheduleofLeverageRatiosDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/DebtScheduleofLeverageRatiosDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentLineItems_ef2369c7-1580-467c-aa78-3b5d627fe2b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantLeverageRatioMaximum_bc80ad72-95dc-437f-8376-aabaf2a519e4" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantLeverageRatioMaximum"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ef2369c7-1580-467c-aa78-3b5d627fe2b2" xlink:to="loc_wdc_DebtInstrumentCovenantLeverageRatioMaximum_bc80ad72-95dc-437f-8376-aabaf2a519e4" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentTable_ce82549d-9038-4f5a-be3f-74aa4f51e612" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DebtInstrumentLineItems_ef2369c7-1580-467c-aa78-3b5d627fe2b2" xlink:to="loc_us-gaap_DebtInstrumentTable_ce82549d-9038-4f5a-be3f-74aa4f51e612" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityAxis_c4a47a17-ab94-4cac-9ffd-d00cc30b8117" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ce82549d-9038-4f5a-be3f-74aa4f51e612" xlink:to="loc_us-gaap_CreditFacilityAxis_c4a47a17-ab94-4cac-9ffd-d00cc30b8117" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_c4a47a17-ab94-4cac-9ffd-d00cc30b8117_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_CreditFacilityAxis_c4a47a17-ab94-4cac-9ffd-d00cc30b8117" xlink:to="loc_us-gaap_CreditFacilityDomain_c4a47a17-ab94-4cac-9ffd-d00cc30b8117_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CreditFacilityDomain_06282f08-ea67-4d1c-8af0-12b7ee124b95" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CreditFacilityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_CreditFacilityAxis_c4a47a17-ab94-4cac-9ffd-d00cc30b8117" xlink:to="loc_us-gaap_CreditFacilityDomain_06282f08-ea67-4d1c-8af0-12b7ee124b95" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevolvingCreditFacilityMember_098c7c90-b501-4fe1-a9a1-3d7136d3bd8e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevolvingCreditFacilityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_CreditFacilityDomain_06282f08-ea67-4d1c-8af0-12b7ee124b95" xlink:to="loc_us-gaap_RevolvingCreditFacilityMember_098c7c90-b501-4fe1-a9a1-3d7136d3bd8e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantPeriodAxis_3b27c8de-4a26-4e5c-9c52-45b5310b958e" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DebtInstrumentTable_ce82549d-9038-4f5a-be3f-74aa4f51e612" xlink:to="loc_wdc_DebtInstrumentCovenantPeriodAxis_3b27c8de-4a26-4e5c-9c52-45b5310b958e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantPeriodDomain_3b27c8de-4a26-4e5c-9c52-45b5310b958e_default" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wdc_DebtInstrumentCovenantPeriodAxis_3b27c8de-4a26-4e5c-9c52-45b5310b958e" xlink:to="loc_wdc_DebtInstrumentCovenantPeriodDomain_3b27c8de-4a26-4e5c-9c52-45b5310b958e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantPeriodDomain_6e12510a-b64e-40f6-b4ae-8a5425969b30" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wdc_DebtInstrumentCovenantPeriodAxis_3b27c8de-4a26-4e5c-9c52-45b5310b958e" xlink:to="loc_wdc_DebtInstrumentCovenantPeriodDomain_6e12510a-b64e-40f6-b4ae-8a5425969b30" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantPeriodOneMember_b6e5d787-6170-49c8-880e-d5b320092a45" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantPeriodOneMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_DebtInstrumentCovenantPeriodDomain_6e12510a-b64e-40f6-b4ae-8a5425969b30" xlink:to="loc_wdc_DebtInstrumentCovenantPeriodOneMember_b6e5d787-6170-49c8-880e-d5b320092a45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantPeriodFourMember_13637ec7-3077-4388-9136-526fdf0d6c74" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantPeriodFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_DebtInstrumentCovenantPeriodDomain_6e12510a-b64e-40f6-b4ae-8a5425969b30" xlink:to="loc_wdc_DebtInstrumentCovenantPeriodFourMember_13637ec7-3077-4388-9136-526fdf0d6c74" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantPeriodFiveMember_df13c31f-3990-481f-8363-e1b6edd6ee29" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantPeriodFiveMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_DebtInstrumentCovenantPeriodDomain_6e12510a-b64e-40f6-b4ae-8a5425969b30" xlink:to="loc_wdc_DebtInstrumentCovenantPeriodFiveMember_df13c31f-3990-481f-8363-e1b6edd6ee29" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantPeriodSixMember_4deae85f-7bb3-4993-88df-ac5110c7aa67" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantPeriodSixMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_DebtInstrumentCovenantPeriodDomain_6e12510a-b64e-40f6-b4ae-8a5425969b30" xlink:to="loc_wdc_DebtInstrumentCovenantPeriodSixMember_4deae85f-7bb3-4993-88df-ac5110c7aa67" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantPeriodSevenMember_57a672f8-19ba-40f5-9a2f-a246e2f72ec0" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantPeriodSevenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_DebtInstrumentCovenantPeriodDomain_6e12510a-b64e-40f6-b4ae-8a5425969b30" xlink:to="loc_wdc_DebtInstrumentCovenantPeriodSevenMember_57a672f8-19ba-40f5-9a2f-a246e2f72ec0" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantPeriodEightMember_f468aff4-2d7b-4390-9869-f510a11d2f60" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantPeriodEightMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_DebtInstrumentCovenantPeriodDomain_6e12510a-b64e-40f6-b4ae-8a5425969b30" xlink:to="loc_wdc_DebtInstrumentCovenantPeriodEightMember_f468aff4-2d7b-4390-9869-f510a11d2f60" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantPeriodNineMember_e39dd9de-9ba8-4397-995f-8a51e80f319b" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantPeriodNineMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_DebtInstrumentCovenantPeriodDomain_6e12510a-b64e-40f6-b4ae-8a5425969b30" xlink:to="loc_wdc_DebtInstrumentCovenantPeriodNineMember_e39dd9de-9ba8-4397-995f-8a51e80f319b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DebtInstrumentCovenantPeriodTenMember_b708460b-cced-490b-803f-496d23688331" xlink:href="wdc-20230630.xsd#wdc_DebtInstrumentCovenantPeriodTenMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_DebtInstrumentCovenantPeriodDomain_6e12510a-b64e-40f6-b4ae-8a5425969b30" xlink:to="loc_wdc_DebtInstrumentCovenantPeriodTenMember_b708460b-cced-490b-803f-496d23688331" xlink:type="arc" order="7"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansAdditionalInformationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#PensionandOtherPostRetirementBenefitPlansAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_758c8ea4-79fa-44a7-ab0e-c39244ae8f08" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_23a74d11-9e0c-4699-a7e1-c9ff3426fce7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_758c8ea4-79fa-44a7-ab0e-c39244ae8f08" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_23a74d11-9e0c-4699-a7e1-c9ff3426fce7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_db9c395c-9faa-440b-836a-ce0244fedf37" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_758c8ea4-79fa-44a7-ab0e-c39244ae8f08" xlink:to="loc_us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation_db9c395c-9faa-440b-836a-ce0244fedf37" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_e9f40c38-fc13-467a-b0ce-c55c3391b181" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_758c8ea4-79fa-44a7-ab0e-c39244ae8f08" xlink:to="loc_us-gaap_OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax_e9f40c38-fc13-467a-b0ce-c55c3391b181" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PriorServiceCreditsForDefinedBenefitPensionPlansIncludedInAccumulatedOtherComprehensiveIncomeAtBalanceSheetDate_1d7a777f-fe2a-438b-b30d-dfd0bb77e9f3" xlink:href="wdc-20230630.xsd#wdc_PriorServiceCreditsForDefinedBenefitPensionPlansIncludedInAccumulatedOtherComprehensiveIncomeAtBalanceSheetDate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_758c8ea4-79fa-44a7-ab0e-c39244ae8f08" xlink:to="loc_wdc_PriorServiceCreditsForDefinedBenefitPensionPlansIncludedInAccumulatedOtherComprehensiveIncomeAtBalanceSheetDate_1d7a777f-fe2a-438b-b30d-dfd0bb77e9f3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_7846a7a5-738e-4f04-882b-434af3ba56b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_758c8ea4-79fa-44a7-ab0e-c39244ae8f08" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsTargetAllocationPercentage_7846a7a5-738e-4f04-882b-434af3ba56b2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DefinedBenefitPlanEstimatedAnnualBenefitsPaymentPeriod_6d6c4330-87d2-42dc-8c7c-19ae4ea3859a" xlink:href="wdc-20230630.xsd#wdc_DefinedBenefitPlanEstimatedAnnualBenefitsPaymentPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_758c8ea4-79fa-44a7-ab0e-c39244ae8f08" xlink:to="loc_wdc_DefinedBenefitPlanEstimatedAnnualBenefitsPaymentPeriod_6d6c4330-87d2-42dc-8c7c-19ae4ea3859a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1aa4e2a8-3d70-4df9-833f-adcae35a4db9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_758c8ea4-79fa-44a7-ab0e-c39244ae8f08" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1aa4e2a8-3d70-4df9-833f-adcae35a4db9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_5f8c5e0e-f37d-46e1-9aaf-6d75b2e3713c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1aa4e2a8-3d70-4df9-833f-adcae35a4db9" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_5f8c5e0e-f37d-46e1-9aaf-6d75b2e3713c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_5f8c5e0e-f37d-46e1-9aaf-6d75b2e3713c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_5f8c5e0e-f37d-46e1-9aaf-6d75b2e3713c" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_5f8c5e0e-f37d-46e1-9aaf-6d75b2e3713c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_f0a3ccf0-85cc-468c-987a-39bab6c1a5b7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_5f8c5e0e-f37d-46e1-9aaf-6d75b2e3713c" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_f0a3ccf0-85cc-468c-987a-39bab6c1a5b7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_6d18183a-e367-4f1a-b46d-44806e6219b8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_f0a3ccf0-85cc-468c-987a-39bab6c1a5b7" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_6d18183a-e367-4f1a-b46d-44806e6219b8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_151e6363-4a65-40f0-99ae-d712ccec96f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1aa4e2a8-3d70-4df9-833f-adcae35a4db9" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_151e6363-4a65-40f0-99ae-d712ccec96f3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_151e6363-4a65-40f0-99ae-d712ccec96f3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_151e6363-4a65-40f0-99ae-d712ccec96f3" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_151e6363-4a65-40f0-99ae-d712ccec96f3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_cec59e25-54ff-4596-8c10-bba4137397da" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_151e6363-4a65-40f0-99ae-d712ccec96f3" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_cec59e25-54ff-4596-8c10-bba4137397da" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDebtSecurityMember_3b99fa4c-12ca-4245-9bbb-94569dd40fde" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDebtSecurityMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_cec59e25-54ff-4596-8c10-bba4137397da" xlink:to="loc_us-gaap_DefinedBenefitPlanDebtSecurityMember_3b99fa4c-12ca-4245-9bbb-94569dd40fde" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_f57a627c-ed6c-4cb5-8a1d-2585422188ab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanEquitySecuritiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_cec59e25-54ff-4596-8c10-bba4137397da" xlink:to="loc_us-gaap_DefinedBenefitPlanEquitySecuritiesMember_f57a627c-ed6c-4cb5-8a1d-2585422188ab" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DefinedBenefitPlanOtherAssetsMember_f76ab9ee-920e-4a3e-8a32-8b93a861f34b" xlink:href="wdc-20230630.xsd#wdc_DefinedBenefitPlanOtherAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_cec59e25-54ff-4596-8c10-bba4137397da" xlink:to="loc_wdc_DefinedBenefitPlanOtherAssetsMember_f76ab9ee-920e-4a3e-8a32-8b93a861f34b" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_69f0de33-ef7a-4d30-9da3-954e4309f517" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_1aa4e2a8-3d70-4df9-833f-adcae35a4db9" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_69f0de33-ef7a-4d30-9da3-954e4309f517" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_69f0de33-ef7a-4d30-9da3-954e4309f517_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_69f0de33-ef7a-4d30-9da3-954e4309f517" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_69f0de33-ef7a-4d30-9da3-954e4309f517_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_0af5f68c-2bd1-4742-b3da-ae999c22b709" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_69f0de33-ef7a-4d30-9da3-954e4309f517" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_0af5f68c-2bd1-4742-b3da-ae999c22b709" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_576aae31-c5af-4390-869f-dc67cf430a35" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_0af5f68c-2bd1-4742-b3da-ae999c22b709" xlink:to="loc_us-gaap_ForeignPlanMember_576aae31-c5af-4390-869f-dc67cf430a35" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansObligationsandFundedStatusDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#PensionandOtherPostRetirementBenefitPlansObligationsandFundedStatusDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansObligationsandFundedStatusDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_c3257623-58fe-4a2c-931b-059803f5cd43" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_3ebd97a1-9b30-494b-ae88-58919f27349c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_c3257623-58fe-4a2c-931b-059803f5cd43" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_3ebd97a1-9b30-494b-ae88-58919f27349c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_46b84472-087a-4b9b-aa20-d20b97c19c73" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_3ebd97a1-9b30-494b-ae88-58919f27349c" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligation_46b84472-087a-4b9b-aa20-d20b97c19c73" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanServiceCost_cb6d5892-7574-436c-ae90-caced78a2b68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanServiceCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_3ebd97a1-9b30-494b-ae88-58919f27349c" xlink:to="loc_us-gaap_DefinedBenefitPlanServiceCost_cb6d5892-7574-436c-ae90-caced78a2b68" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanInterestCost_9be8e59c-f56c-4e3b-9853-2a6a0025ab0d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanInterestCost"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_3ebd97a1-9b30-494b-ae88-58919f27349c" xlink:to="loc_us-gaap_DefinedBenefitPlanInterestCost_9be8e59c-f56c-4e3b-9853-2a6a0025ab0d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAmendments_a50dec92-98b7-41fd-b7db-41a7f438f6a2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanPlanAmendments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_3ebd97a1-9b30-494b-ae88-58919f27349c" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAmendments_a50dec92-98b7-41fd-b7db-41a7f438f6a2" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_86845e39-7a29-4287-9e42-d79245e8b80a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanActuarialGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_3ebd97a1-9b30-494b-ae88-58919f27349c" xlink:to="loc_us-gaap_DefinedBenefitPlanActuarialGainLoss_86845e39-7a29-4287-9e42-d79245e8b80a" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_abf2cf12-9808-43bd-a857-0c3652096dd2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_3ebd97a1-9b30-494b-ae88-58919f27349c" xlink:to="loc_us-gaap_DefinedBenefitPlanBenefitObligationBenefitsPaid_abf2cf12-9808-43bd-a857-0c3652096dd2" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanSettlementsBenefitObligation_566c8773-3593-47f1-bb6b-cee80d84415a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanSettlementsBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_3ebd97a1-9b30-494b-ae88-58919f27349c" xlink:to="loc_us-gaap_DefinedBenefitPlanSettlementsBenefitObligation_566c8773-3593-47f1-bb6b-cee80d84415a" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_462dfac9-78f2-4be4-97f7-1e8553095b95" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInBenefitObligationRollForward_3ebd97a1-9b30-494b-ae88-58919f27349c" xlink:to="loc_us-gaap_DefinedBenefitPlanForeignCurrencyExchangeRateChangesBenefitObligation_462dfac9-78f2-4be4-97f7-1e8553095b95" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanBenefitObligation_eff690e7-eb70-45b2-8e0d-8da81d89732e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanBenefitObligation"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0ca2a375-b4ae-42b7-bda1-5f5d4dfb4a8e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_c3257623-58fe-4a2c-931b-059803f5cd43" xlink:to="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0ca2a375-b4ae-42b7-bda1-5f5d4dfb4a8e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_63e3b880-1673-4175-9395-fa5f6847f9fe" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0ca2a375-b4ae-42b7-bda1-5f5d4dfb4a8e" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_63e3b880-1673-4175-9395-fa5f6847f9fe" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_e14f4769-2859-4e40-a7de-6e523c10cc53" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0ca2a375-b4ae-42b7-bda1-5f5d4dfb4a8e" xlink:to="loc_us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets_e14f4769-2859-4e40-a7de-6e523c10cc53" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_eba69e15-1e1a-47f2-b792-ad9ca3cab328" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanContributionsByEmployer"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0ca2a375-b4ae-42b7-bda1-5f5d4dfb4a8e" xlink:to="loc_us-gaap_DefinedBenefitPlanContributionsByEmployer_eba69e15-1e1a-47f2-b792-ad9ca3cab328" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_cb1e713c-d877-4cf7-b5e2-53c2c08585a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0ca2a375-b4ae-42b7-bda1-5f5d4dfb4a8e" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsBenefitsPaid_cb1e713c-d877-4cf7-b5e2-53c2c08585a3" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_c1222aeb-875e-4a9b-a47a-c8eb31685850" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanChangeInFairValueOfPlanAssetsRollForward_0ca2a375-b4ae-42b7-bda1-5f5d4dfb4a8e" xlink:to="loc_us-gaap_DefinedBenefitPlanPlanAssetsForeignCurrencyTranslationGainLoss_c1222aeb-875e-4a9b-a47a-c8eb31685850" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_9ed3a293-0fa7-4bbc-b092-3338ade47a0f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_468622bd-d506-486a-80c2-13f809e84c1c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanFundedStatusOfPlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_c3257623-58fe-4a2c-931b-059803f5cd43" xlink:to="loc_us-gaap_DefinedBenefitPlanFundedStatusOfPlan_468622bd-d506-486a-80c2-13f809e84c1c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_4b7ca1df-96cf-45d0-bd39-f9d8f6d2231c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansTableTextBlockLineItems_c3257623-58fe-4a2c-931b-059803f5cd43" xlink:to="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_4b7ca1df-96cf-45d0-bd39-f9d8f6d2231c" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_a98e1b0b-0d21-494c-886b-b9c9b8ad160e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_4b7ca1df-96cf-45d0-bd39-f9d8f6d2231c" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_a98e1b0b-0d21-494c-886b-b9c9b8ad160e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_a98e1b0b-0d21-494c-886b-b9c9b8ad160e_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_a98e1b0b-0d21-494c-886b-b9c9b8ad160e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_a98e1b0b-0d21-494c-886b-b9c9b8ad160e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_77d93e52-43c4-435b-b367-08028d8bf2b4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_a98e1b0b-0d21-494c-886b-b9c9b8ad160e" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_77d93e52-43c4-435b-b367-08028d8bf2b4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_a80e57b7-1218-4ed4-9caf-88df85a767a1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_77d93e52-43c4-435b-b367-08028d8bf2b4" xlink:to="loc_us-gaap_ForeignPlanMember_a80e57b7-1218-4ed4-9caf-88df85a767a1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeAxis_9ae51502-d4f4-409d-b7ed-347f042c81f9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_DefinedBenefitPlansAndOtherPostretirementBenefitPlansDisclosuresTable_4b7ca1df-96cf-45d0-bd39-f9d8f6d2231c" xlink:to="loc_us-gaap_RetirementPlanTypeAxis_9ae51502-d4f4-409d-b7ed-347f042c81f9" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_9ae51502-d4f4-409d-b7ed-347f042c81f9_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_9ae51502-d4f4-409d-b7ed-347f042c81f9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_9ae51502-d4f4-409d-b7ed-347f042c81f9_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanTypeDomain_8ee6c0c8-c059-4cbf-9644-00e83693f9d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanTypeAxis_9ae51502-d4f4-409d-b7ed-347f042c81f9" xlink:to="loc_us-gaap_RetirementPlanTypeDomain_8ee6c0c8-c059-4cbf-9644-00e83693f9d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PensionPlansDefinedBenefitMember_0c43f633-8f5e-444d-9a1c-23f62b06956c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PensionPlansDefinedBenefitMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanTypeDomain_8ee6c0c8-c059-4cbf-9644-00e83693f9d6" xlink:to="loc_us-gaap_PensionPlansDefinedBenefitMember_0c43f633-8f5e-444d-9a1c-23f62b06956c" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansWeightedAverageActuarialAssumptionsusedtoDetermineBenefitObligationsDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#PensionandOtherPostRetirementBenefitPlansWeightedAverageActuarialAssumptionsusedtoDetermineBenefitObligationsDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansWeightedAverageActuarialAssumptionsusedtoDetermineBenefitObligationsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_3500c6e6-8c09-4921-9f24-06d1569ba4d0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_cbac9416-00e8-451c-a0de-4d362f0f5d7f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_3500c6e6-8c09-4921-9f24-06d1569ba4d0" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationDiscountRate_cbac9416-00e8-451c-a0de-4d362f0f5d7f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_d1337bcd-50ac-4781-a64e-82f8d8047baa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_3500c6e6-8c09-4921-9f24-06d1569ba4d0" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingBenefitObligationRateOfCompensationIncrease_d1337bcd-50ac-4781-a64e-82f8d8047baa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ac331991-111c-410e-aa10-fbc9a087d132" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_3500c6e6-8c09-4921-9f24-06d1569ba4d0" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ac331991-111c-410e-aa10-fbc9a087d132" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_455fda76-bc6c-4d4b-a5a4-eb6af97f9904" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_ac331991-111c-410e-aa10-fbc9a087d132" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_455fda76-bc6c-4d4b-a5a4-eb6af97f9904" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_455fda76-bc6c-4d4b-a5a4-eb6af97f9904_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_455fda76-bc6c-4d4b-a5a4-eb6af97f9904" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_455fda76-bc6c-4d4b-a5a4-eb6af97f9904_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_0711db99-731c-4e61-8338-d1e18c2ff920" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_455fda76-bc6c-4d4b-a5a4-eb6af97f9904" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_0711db99-731c-4e61-8338-d1e18c2ff920" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_2381cf46-05fd-4d4b-9da9-8224a2cb200e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_0711db99-731c-4e61-8338-d1e18c2ff920" xlink:to="loc_us-gaap_ForeignPlanMember_2381cf46-05fd-4d4b-9da9-8224a2cb200e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansWeightedAverageActuarialAssumptionsusedtoDetermineBenefitCostsDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#PensionandOtherPostRetirementBenefitPlansWeightedAverageActuarialAssumptionsusedtoDetermineBenefitCostsDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansWeightedAverageActuarialAssumptionsusedtoDetermineBenefitCostsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_278d5ea0-cd9c-4fa0-a1d1-6c8a95914f8a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_71bb78b8-6e8d-48b4-8c09-0371d0f75bb6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_278d5ea0-cd9c-4fa0-a1d1-6c8a95914f8a" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostDiscountRate_71bb78b8-6e8d-48b4-8c09-0371d0f75bb6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_43e3002c-db64-4bbb-a962-5b6467b14851" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_278d5ea0-cd9c-4fa0-a1d1-6c8a95914f8a" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets_43e3002c-db64-4bbb-a962-5b6467b14851" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_32e7e780-24bb-401d-92e0-51efd30999c1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_278d5ea0-cd9c-4fa0-a1d1-6c8a95914f8a" xlink:to="loc_us-gaap_DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostRateOfCompensationIncrease_32e7e780-24bb-401d-92e0-51efd30999c1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_796b6a91-d8f3-4b93-b223-dc99c57bc5a0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_278d5ea0-cd9c-4fa0-a1d1-6c8a95914f8a" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_796b6a91-d8f3-4b93-b223-dc99c57bc5a0" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationAxis_1212a833-e56c-4d04-867b-dacd2f07323b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_796b6a91-d8f3-4b93-b223-dc99c57bc5a0" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationAxis_1212a833-e56c-4d04-867b-dacd2f07323b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_1212a833-e56c-4d04-867b-dacd2f07323b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_1212a833-e56c-4d04-867b-dacd2f07323b" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_1212a833-e56c-4d04-867b-dacd2f07323b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetirementPlanSponsorLocationDomain_af1492c5-964f-4ecd-b625-e1bbaea886d6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetirementPlanSponsorLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationAxis_1212a833-e56c-4d04-867b-dacd2f07323b" xlink:to="loc_us-gaap_RetirementPlanSponsorLocationDomain_af1492c5-964f-4ecd-b625-e1bbaea886d6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ForeignPlanMember_8585974a-159a-4bc4-b064-776abf6c2e3b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ForeignPlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RetirementPlanSponsorLocationDomain_af1492c5-964f-4ecd-b625-e1bbaea886d6" xlink:to="loc_us-gaap_ForeignPlanMember_8585974a-159a-4bc4-b064-776abf6c2e3b" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansDefinedBenefitPensionPlansMajorAssetCategoriesandTheirAssociatedFairValuesDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#PensionandOtherPostRetirementBenefitPlansDefinedBenefitPensionPlansMajorAssetCategoriesandTheirAssociatedFairValuesDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/PensionandOtherPostRetirementBenefitPlansDefinedBenefitPensionPlansMajorAssetCategoriesandTheirAssociatedFairValuesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_f21382db-0f21-4fc8-97ef-9d023523bf9f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_c625093b-9285-44cd-b3c0-24d67daadab7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanFairValueOfPlanAssets"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_f21382db-0f21-4fc8-97ef-9d023523bf9f" xlink:to="loc_us-gaap_DefinedBenefitPlanFairValueOfPlanAssets_c625093b-9285-44cd-b3c0-24d67daadab7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DefinedBenefitPlanPlanAssetsAmountIncludingAssetsSubjectToLeveling_9b135109-78d8-4415-9575-0d6d5f1742d5" xlink:href="wdc-20230630.xsd#wdc_DefinedBenefitPlanPlanAssetsAmountIncludingAssetsSubjectToLeveling"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_f21382db-0f21-4fc8-97ef-9d023523bf9f" xlink:to="loc_wdc_DefinedBenefitPlanPlanAssetsAmountIncludingAssetsSubjectToLeveling_9b135109-78d8-4415-9575-0d6d5f1742d5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_a19fad50-3181-4d60-9106-2cfc9ef1f4ac" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_f21382db-0f21-4fc8-97ef-9d023523bf9f" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_a19fad50-3181-4d60-9106-2cfc9ef1f4ac" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_04629308-2ca9-422e-a4f4-528207d5674f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_a19fad50-3181-4d60-9106-2cfc9ef1f4ac" xlink:to="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_04629308-2ca9-422e-a4f4-528207d5674f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_04629308-2ca9-422e-a4f4-528207d5674f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_04629308-2ca9-422e-a4f4-528207d5674f" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_04629308-2ca9-422e-a4f4-528207d5674f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanAssetCategoriesDomain_9cfd2480-8b42-42e2-a016-3c5c42a0d63e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanAssetCategoriesDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis_04629308-2ca9-422e-a4f4-528207d5674f" xlink:to="loc_us-gaap_PlanAssetCategoriesDomain_9cfd2480-8b42-42e2-a016-3c5c42a0d63e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DefinedBenefitPlanEquityCommingledMutualFundsMember_f910e322-ed25-41d7-9100-5e2164c12994" xlink:href="wdc-20230630.xsd#wdc_DefinedBenefitPlanEquityCommingledMutualFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_9cfd2480-8b42-42e2-a016-3c5c42a0d63e" xlink:to="loc_wdc_DefinedBenefitPlanEquityCommingledMutualFundsMember_f910e322-ed25-41d7-9100-5e2164c12994" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DefinedBenefitPlanFixedIncomeCommingledMutualFundsMember_dad087ce-3f77-42d9-a52c-bba0ae4129d3" xlink:href="wdc-20230630.xsd#wdc_DefinedBenefitPlanFixedIncomeCommingledMutualFundsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_9cfd2480-8b42-42e2-a016-3c5c42a0d63e" xlink:to="loc_wdc_DefinedBenefitPlanFixedIncomeCommingledMutualFundsMember_dad087ce-3f77-42d9-a52c-bba0ae4129d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_NetPlanAssetsSubjectToLevelingMember_2481c2ee-6a0e-4adc-aaea-4cc659c6f289" xlink:href="wdc-20230630.xsd#wdc_NetPlanAssetsSubjectToLevelingMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_9cfd2480-8b42-42e2-a016-3c5c42a0d63e" xlink:to="loc_wdc_NetPlanAssetsSubjectToLevelingMember_2481c2ee-6a0e-4adc-aaea-4cc659c6f289" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_RealEstateInvestmentTrustMember_9fea7b21-55f6-43bb-b745-90e634a167cd" xlink:href="wdc-20230630.xsd#wdc_RealEstateInvestmentTrustMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanAssetCategoriesDomain_9cfd2480-8b42-42e2-a016-3c5c42a0d63e" xlink:to="loc_wdc_RealEstateInvestmentTrustMember_9fea7b21-55f6-43bb-b745-90e634a167cd" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f5e5cf6e-6452-4a4b-9748-58b0ab38ef44" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueByFairValueHierarchyLevelAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_a19fad50-3181-4d60-9106-2cfc9ef1f4ac" xlink:to="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f5e5cf6e-6452-4a4b-9748-58b0ab38ef44" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f5e5cf6e-6452-4a4b-9748-58b0ab38ef44_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f5e5cf6e-6452-4a4b-9748-58b0ab38ef44" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_f5e5cf6e-6452-4a4b-9748-58b0ab38ef44_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_16c4e622-2f53-4d35-8a95-171b2f031cee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasurementsFairValueHierarchyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_FairValueByFairValueHierarchyLevelAxis_f5e5cf6e-6452-4a4b-9748-58b0ab38ef44" xlink:to="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_16c4e622-2f53-4d35-8a95-171b2f031cee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel1Member_b1c36bb9-7040-431a-af21-2fa0222cb040" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel1Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_16c4e622-2f53-4d35-8a95-171b2f031cee" xlink:to="loc_us-gaap_FairValueInputsLevel1Member_b1c36bb9-7040-431a-af21-2fa0222cb040" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel2Member_f20bd20d-ed2a-4656-b87c-fe4652076945" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel2Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_16c4e622-2f53-4d35-8a95-171b2f031cee" xlink:to="loc_us-gaap_FairValueInputsLevel2Member_f20bd20d-ed2a-4656-b87c-fe4652076945" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueInputsLevel3Member_f3003548-0219-4ab5-a523-25a7d2a53d5e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueInputsLevel3Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_16c4e622-2f53-4d35-8a95-171b2f031cee" xlink:to="loc_us-gaap_FairValueInputsLevel3Member_f3003548-0219-4ab5-a523-25a7d2a53d5e" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_0c734d88-707e-4474-9105-cc692faa03b5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_FairValueMeasurementsFairValueHierarchyDomain_16c4e622-2f53-4d35-8a95-171b2f031cee" xlink:to="loc_us-gaap_FairValueMeasuredAtNetAssetValuePerShareMember_0c734d88-707e-4474-9105-cc692faa03b5" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/RelatedPartiesandRelatedCommitmentsandContingenciesAdditionalInformationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#RelatedPartiesandRelatedCommitmentsandContingenciesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/RelatedPartiesandRelatedCommitmentsandContingenciesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsLineItems_8130d2b6-fb8c-4d50-8172-9e996653e171" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsAbstract"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_8130d2b6-fb8c-4d50-8172-9e996653e171" xlink:to="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_NumberOfLegalEntities_417c1edd-de10-4479-bcc2-de4be98772eb" xlink:href="wdc-20230630.xsd#wdc_NumberOfLegalEntities"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_wdc_NumberOfLegalEntities_417c1edd-de10-4479-bcc2-de4be98772eb" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_6994cf01-057a-4cae-bea8-e0aa97c33569" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentOwnershipPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_us-gaap_EquityMethodInvestmentOwnershipPercentage_6994cf01-057a-4cae-bea8-e0aa97c33569" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitment_15ba5039-afab-482e-86ac-41987fad315d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_us-gaap_OtherCommitment_15ba5039-afab-482e-86ac-41987fad315d" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_OtherCommitmentFutureBuildingDepreciationPrepayment_9dbe22bc-4c26-48a8-ae81-513106b843fa" xlink:href="wdc-20230630.xsd#wdc_OtherCommitmentFutureBuildingDepreciationPrepayment"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_wdc_OtherCommitmentFutureBuildingDepreciationPrepayment_9dbe22bc-4c26-48a8-ae81-513106b843fa" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_01aca195-8785-4d91-8bca-f8179095bed8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsToAcquireEquityMethodInvestments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_us-gaap_PaymentsToAcquireEquityMethodInvestments_01aca195-8785-4d91-8bca-f8179095bed8" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsPayableCurrent_a30641d1-4d16-4912-878b-a2ad01b974ec" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_us-gaap_AccountsPayableCurrent_a30641d1-4d16-4912-878b-a2ad01b974ec" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees_1620b330-8f71-40b9-bbbf-40047fba05dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_us-gaap_RetainedEarningsUndistributedEarningsFromEquityMethodInvestees_1620b330-8f71-40b9-bbbf-40047fba05dd" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_InvestmentFundingCommitments_1de2128a-0151-4a0f-8188-5288782c9a4a" xlink:href="wdc-20230630.xsd#wdc_InvestmentFundingCommitments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_wdc_InvestmentFundingCommitments_1de2128a-0151-4a0f-8188-5288782c9a4a" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ManufacturingCapacityPercentOperating_448e7607-a5a6-4699-ab49-e2b5a06201df" xlink:href="wdc-20230630.xsd#wdc_ManufacturingCapacityPercentOperating"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_wdc_ManufacturingCapacityPercentOperating_448e7607-a5a6-4699-ab49-e2b5a06201df" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_CostsAssociatedWithUnderutilizedCapacityAsAResultOfATemporaryAbnormalReductionInProduction_8d770835-eb46-4893-a9af-089c59785e30" xlink:href="wdc-20230630.xsd#wdc_CostsAssociatedWithUnderutilizedCapacityAsAResultOfATemporaryAbnormalReductionInProduction"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_wdc_CostsAssociatedWithUnderutilizedCapacityAsAResultOfATemporaryAbnormalReductionInProduction_8d770835-eb46-4893-a9af-089c59785e30" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_CostsAssociatedWithUnderutilizedCapacityAsAResultOfUnexpectedPowerOutageIncident_3838ec1c-dffc-43ed-affb-f962a4381867" xlink:href="wdc-20230630.xsd#wdc_CostsAssociatedWithUnderutilizedCapacityAsAResultOfUnexpectedPowerOutageIncident"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_wdc_CostsAssociatedWithUnderutilizedCapacityAsAResultOfUnexpectedPowerOutageIncident_3838ec1c-dffc-43ed-affb-f962a4381867" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PartnersOwnershipInVentureBusiness_22034211-c5cd-4006-8cc2-0270ea4ae825" xlink:href="wdc-20230630.xsd#wdc_PartnersOwnershipInVentureBusiness"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_wdc_PartnersOwnershipInVentureBusiness_22034211-c5cd-4006-8cc2-0270ea4ae825" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskPercentage1_753105a7-0821-40cb-993f-7114c0c162fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskPercentage1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionsAbstract_0bc30613-9716-4795-8d92-5a4b3eeb13ca" xlink:to="loc_us-gaap_ConcentrationRiskPercentage1_753105a7-0821-40cb-993f-7114c0c162fb" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable_5db5a740-654b-4764-85bc-52473450bdae" xlink:href="wdc-20230630.xsd#wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_8130d2b6-fb8c-4d50-8172-9e996653e171" xlink:to="loc_wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable_5db5a740-654b-4764-85bc-52473450bdae" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_94a27bd2-cce7-4787-bc44-b8beed6218cd" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable_5db5a740-654b-4764-85bc-52473450bdae" xlink:to="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_94a27bd2-cce7-4787-bc44-b8beed6218cd" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_94a27bd2-cce7-4787-bc44-b8beed6218cd_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_94a27bd2-cce7-4787-bc44-b8beed6218cd" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_94a27bd2-cce7-4787-bc44-b8beed6218cd_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_EquityMethodInvesteeNameDomain_1b1007b3-4638-4b39-bc1b-1d7be13e901e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_EquityMethodInvesteeNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis_94a27bd2-cce7-4787-bc44-b8beed6218cd" xlink:to="loc_srt_EquityMethodInvesteeNameDomain_1b1007b3-4638-4b39-bc1b-1d7be13e901e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_KioxiaCorporationMember_88c21199-0be9-4ea9-96eb-3306722997c8" xlink:href="wdc-20230630.xsd#wdc_KioxiaCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_1b1007b3-4638-4b39-bc1b-1d7be13e901e" xlink:to="loc_wdc_KioxiaCorporationMember_88c21199-0be9-4ea9-96eb-3306722997c8" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_FlashVenturesMember_6213acf9-624a-4d92-9c71-e18397d9fa6e" xlink:href="wdc-20230630.xsd#wdc_FlashVenturesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_1b1007b3-4638-4b39-bc1b-1d7be13e901e" xlink:to="loc_wdc_FlashVenturesMember_6213acf9-624a-4d92-9c71-e18397d9fa6e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_UnisVentureMember_d3c29a10-9317-465a-aff8-ce0084a41f6c" xlink:href="wdc-20230630.xsd#wdc_UnisVentureMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_EquityMethodInvesteeNameDomain_1b1007b3-4638-4b39-bc1b-1d7be13e901e" xlink:to="loc_wdc_UnisVentureMember_d3c29a10-9317-465a-aff8-ce0084a41f6c" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_LegalEntityAxis_76e86c93-f237-4476-ba0d-c6817b0c6f3d" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_LegalEntityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable_5db5a740-654b-4764-85bc-52473450bdae" xlink:to="loc_dei_LegalEntityAxis_76e86c93-f237-4476-ba0d-c6817b0c6f3d" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_76e86c93-f237-4476-ba0d-c6817b0c6f3d_default" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_dei_LegalEntityAxis_76e86c93-f237-4476-ba0d-c6817b0c6f3d" xlink:to="loc_dei_EntityDomain_76e86c93-f237-4476-ba0d-c6817b0c6f3d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_dei_EntityDomain_5d302fd6-a075-4f55-90d6-f61c566585f2" xlink:href="https://xbrl.sec.gov/dei/2023/dei-2023.xsd#dei_EntityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_dei_LegalEntityAxis_76e86c93-f237-4476-ba0d-c6817b0c6f3d" xlink:to="loc_dei_EntityDomain_5d302fd6-a075-4f55-90d6-f61c566585f2" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_KioxiaCorporationMember_43194435-8c85-4b87-a76a-9ad230a8dee1" xlink:href="wdc-20230630.xsd#wdc_KioxiaCorporationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_5d302fd6-a075-4f55-90d6-f61c566585f2" xlink:to="loc_wdc_KioxiaCorporationMember_43194435-8c85-4b87-a76a-9ad230a8dee1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_UnissoftWuxiGroupCoLtd.Member_6475eff6-98de-44ad-aa5e-6baeeba34437" xlink:href="wdc-20230630.xsd#wdc_UnissoftWuxiGroupCoLtd.Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_dei_EntityDomain_5d302fd6-a075-4f55-90d6-f61c566585f2" xlink:to="loc_wdc_UnissoftWuxiGroupCoLtd.Member_6475eff6-98de-44ad-aa5e-6baeeba34437" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsAxis_e5eb33a6-5c73-4d46-92d1-c686f0f5df61" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable_5db5a740-654b-4764-85bc-52473450bdae" xlink:to="loc_us-gaap_OtherCommitmentsAxis_e5eb33a6-5c73-4d46-92d1-c686f0f5df61" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_e5eb33a6-5c73-4d46-92d1-c686f0f5df61_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_OtherCommitmentsAxis_e5eb33a6-5c73-4d46-92d1-c686f0f5df61" xlink:to="loc_us-gaap_OtherCommitmentsDomain_e5eb33a6-5c73-4d46-92d1-c686f0f5df61_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherCommitmentsDomain_544a2ced-f93a-43a7-a9f9-f76e6eaaba79" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherCommitmentsDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_OtherCommitmentsAxis_e5eb33a6-5c73-4d46-92d1-c686f0f5df61" xlink:to="loc_us-gaap_OtherCommitmentsDomain_544a2ced-f93a-43a7-a9f9-f76e6eaaba79" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PrepaymentsOfFutureDepreciationMember_185d7404-3a6b-4a9f-995d-2bac792ce6b9" xlink:href="wdc-20230630.xsd#wdc_PrepaymentsOfFutureDepreciationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OtherCommitmentsDomain_544a2ced-f93a-43a7-a9f9-f76e6eaaba79" xlink:to="loc_wdc_PrepaymentsOfFutureDepreciationMember_185d7404-3a6b-4a9f-995d-2bac792ce6b9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c8c40d60-399e-48b2-8fd8-1473f1c2614f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable_5db5a740-654b-4764-85bc-52473450bdae" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c8c40d60-399e-48b2-8fd8-1473f1c2614f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_c8c40d60-399e-48b2-8fd8-1473f1c2614f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c8c40d60-399e-48b2-8fd8-1473f1c2614f" xlink:to="loc_us-gaap_RelatedPartyDomain_c8c40d60-399e-48b2-8fd8-1473f1c2614f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_b04aeddf-9bc7-49f2-99d7-3af2a108181c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_c8c40d60-399e-48b2-8fd8-1473f1c2614f" xlink:to="loc_us-gaap_RelatedPartyDomain_b04aeddf-9bc7-49f2-99d7-3af2a108181c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_ff432a65-0cea-47cc-989f-424f235a6458" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_b04aeddf-9bc7-49f2-99d7-3af2a108181c" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_ff432a65-0cea-47cc-989f-424f235a6458" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedAndNonrelatedPartyStatusAxis_ccd5c048-7ec5-478a-9bad-8fedf7eed985" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedAndNonrelatedPartyStatusAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable_5db5a740-654b-4764-85bc-52473450bdae" xlink:to="loc_us-gaap_RelatedAndNonrelatedPartyStatusAxis_ccd5c048-7ec5-478a-9bad-8fedf7eed985" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedAndNonrelatedPartyStatusDomain_ccd5c048-7ec5-478a-9bad-8fedf7eed985_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedAndNonrelatedPartyStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedAndNonrelatedPartyStatusAxis_ccd5c048-7ec5-478a-9bad-8fedf7eed985" xlink:to="loc_us-gaap_RelatedAndNonrelatedPartyStatusDomain_ccd5c048-7ec5-478a-9bad-8fedf7eed985_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedAndNonrelatedPartyStatusDomain_616b2147-217c-4ffd-8dba-ed5837dfe182" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedAndNonrelatedPartyStatusDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedAndNonrelatedPartyStatusAxis_ccd5c048-7ec5-478a-9bad-8fedf7eed985" xlink:to="loc_us-gaap_RelatedAndNonrelatedPartyStatusDomain_616b2147-217c-4ffd-8dba-ed5837dfe182" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_c17311e1-86cf-4a64-a2be-3093d4abb06f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedAndNonrelatedPartyStatusDomain_616b2147-217c-4ffd-8dba-ed5837dfe182" xlink:to="loc_us-gaap_RelatedPartyMember_c17311e1-86cf-4a64-a2be-3093d4abb06f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_EquityMethodInvestorNameAxis_7d9b6278-2a6b-47fe-8ff9-84f77d1c6b6e" xlink:href="wdc-20230630.xsd#wdc_EquityMethodInvestorNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable_5db5a740-654b-4764-85bc-52473450bdae" xlink:to="loc_wdc_EquityMethodInvestorNameAxis_7d9b6278-2a6b-47fe-8ff9-84f77d1c6b6e" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_EquityMethodInvestorNameDomain_7d9b6278-2a6b-47fe-8ff9-84f77d1c6b6e_default" xlink:href="wdc-20230630.xsd#wdc_EquityMethodInvestorNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wdc_EquityMethodInvestorNameAxis_7d9b6278-2a6b-47fe-8ff9-84f77d1c6b6e" xlink:to="loc_wdc_EquityMethodInvestorNameDomain_7d9b6278-2a6b-47fe-8ff9-84f77d1c6b6e_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_EquityMethodInvestorNameDomain_4a6cd719-d99b-49c8-b64c-bdd45aa9e410" xlink:href="wdc-20230630.xsd#wdc_EquityMethodInvestorNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wdc_EquityMethodInvestorNameAxis_7d9b6278-2a6b-47fe-8ff9-84f77d1c6b6e" xlink:to="loc_wdc_EquityMethodInvestorNameDomain_4a6cd719-d99b-49c8-b64c-bdd45aa9e410" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_WesternDigitalCorpMember_663606d2-e3e7-4af4-a921-ed635869ac74" xlink:href="wdc-20230630.xsd#wdc_WesternDigitalCorpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_EquityMethodInvestorNameDomain_4a6cd719-d99b-49c8-b64c-bdd45aa9e410" xlink:to="loc_wdc_WesternDigitalCorpMember_663606d2-e3e7-4af4-a921-ed635869ac74" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_49c5a9a9-3649-470a-9105-49150365eac0" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable_5db5a740-654b-4764-85bc-52473450bdae" xlink:to="loc_srt_RangeAxis_49c5a9a9-3649-470a-9105-49150365eac0" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_49c5a9a9-3649-470a-9105-49150365eac0_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_49c5a9a9-3649-470a-9105-49150365eac0" xlink:to="loc_srt_RangeMember_49c5a9a9-3649-470a-9105-49150365eac0_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_cff46e74-0305-40d7-8fea-68b9ef4f741d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_49c5a9a9-3649-470a-9105-49150365eac0" xlink:to="loc_srt_RangeMember_cff46e74-0305-40d7-8fea-68b9ef4f741d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_bf3e5ca6-4a8a-4ee4-8dd9-a9aa7a9d1a66" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_cff46e74-0305-40d7-8fea-68b9ef4f741d" xlink:to="loc_srt_MinimumMember_bf3e5ca6-4a8a-4ee4-8dd9-a9aa7a9d1a66" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_35c6efcf-d89f-4556-8c57-332410ba443c" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_cff46e74-0305-40d7-8fea-68b9ef4f741d" xlink:to="loc_srt_MaximumMember_35c6efcf-d89f-4556-8c57-332410ba443c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_2a6a3a4b-84fe-4c57-8c1b-4176df66be3f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByBenchmarkAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable_5db5a740-654b-4764-85bc-52473450bdae" xlink:to="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_2a6a3a4b-84fe-4c57-8c1b-4176df66be3f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2a6a3a4b-84fe-4c57-8c1b-4176df66be3f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_2a6a3a4b-84fe-4c57-8c1b-4176df66be3f" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_2a6a3a4b-84fe-4c57-8c1b-4176df66be3f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e978c334-1c6a-4b46-b0e3-41084f3c8724" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskBenchmarkDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByBenchmarkAxis_2a6a3a4b-84fe-4c57-8c1b-4176df66be3f" xlink:to="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e978c334-1c6a-4b46-b0e3-41084f3c8724" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RevenueFromContractWithCustomerMember_52c78957-569a-4ed3-9927-cb98f9394506" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RevenueFromContractWithCustomerMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e978c334-1c6a-4b46-b0e3-41084f3c8724" xlink:to="loc_us-gaap_RevenueFromContractWithCustomerMember_52c78957-569a-4ed3-9927-cb98f9394506" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_AccountsReceivableBenchmarkMember_90501ca9-20c0-4aac-867d-887e8f802386" xlink:href="wdc-20230630.xsd#wdc_AccountsReceivableBenchmarkMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskBenchmarkDomain_e978c334-1c6a-4b46-b0e3-41084f3c8724" xlink:to="loc_wdc_AccountsReceivableBenchmarkMember_90501ca9-20c0-4aac-867d-887e8f802386" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskByTypeAxis_f254dad5-2051-429c-a029-3298e64dc33d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskByTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_ScheduleOfCommitmentsContingenciesAndGuaranteesTable_5db5a740-654b-4764-85bc-52473450bdae" xlink:to="loc_us-gaap_ConcentrationRiskByTypeAxis_f254dad5-2051-429c-a029-3298e64dc33d" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_f254dad5-2051-429c-a029-3298e64dc33d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_f254dad5-2051-429c-a029-3298e64dc33d" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_f254dad5-2051-429c-a029-3298e64dc33d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConcentrationRiskTypeDomain_f9be2a6d-46b6-4804-b9fe-7247cdc23dbc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConcentrationRiskTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ConcentrationRiskByTypeAxis_f254dad5-2051-429c-a029-3298e64dc33d" xlink:to="loc_us-gaap_ConcentrationRiskTypeDomain_f9be2a6d-46b6-4804-b9fe-7247cdc23dbc" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProductConcentrationRiskMember_81bd330f-9a9b-4704-a408-456d522a69ed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProductConcentrationRiskMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ConcentrationRiskTypeDomain_f9be2a6d-46b6-4804-b9fe-7247cdc23dbc" xlink:to="loc_us-gaap_ProductConcentrationRiskMember_81bd330f-9a9b-4704-a408-456d522a69ed" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/RelatedPartiesandRelatedCommitmentsandContingenciesEquityInvestmentsDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#RelatedPartiesandRelatedCommitmentsandContingenciesEquityInvestmentsDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/RelatedPartiesandRelatedCommitmentsandContingenciesEquityInvestmentsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_1c330e3f-da65-4d80-9057-c89033ca66dd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsNotesAndLoansReceivableLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableNet_bcbb0f49-01d8-448a-a4b9-22e6e120e61c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NotesReceivableNet"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_1c330e3f-da65-4d80-9057-c89033ca66dd" xlink:to="loc_us-gaap_NotesReceivableNet_bcbb0f49-01d8-448a-a4b9-22e6e120e61c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_Investments_58a4e8b8-d052-4771-92fd-9467d36f0587" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_Investments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_1c330e3f-da65-4d80-9057-c89033ca66dd" xlink:to="loc_us-gaap_Investments_58a4e8b8-d052-4771-92fd-9467d36f0587" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_NotesReceivableAndInvestmentsInRelatedParties_f1a71252-3d8d-42c0-97b0-fb3eab630f85" xlink:href="wdc-20230630.xsd#wdc_NotesReceivableAndInvestmentsInRelatedParties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_1c330e3f-da65-4d80-9057-c89033ca66dd" xlink:to="loc_wdc_NotesReceivableAndInvestmentsInRelatedParties_f1a71252-3d8d-42c0-97b0-fb3eab630f85" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_930b10eb-2be9-41a0-9051-24edf84db856" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AccountsNotesAndLoansReceivableLineItems_1c330e3f-da65-4d80-9057-c89033ca66dd" xlink:to="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_930b10eb-2be9-41a0-9051-24edf84db856" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_7ff1d6ad-4908-48ac-84e2-87e221b847b3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_930b10eb-2be9-41a0-9051-24edf84db856" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_7ff1d6ad-4908-48ac-84e2-87e221b847b3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_7ff1d6ad-4908-48ac-84e2-87e221b847b3_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_7ff1d6ad-4908-48ac-84e2-87e221b847b3" xlink:to="loc_us-gaap_RelatedPartyDomain_7ff1d6ad-4908-48ac-84e2-87e221b847b3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_79d7640d-0162-4595-9f43-c7c7cd3989ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_7ff1d6ad-4908-48ac-84e2-87e221b847b3" xlink:to="loc_us-gaap_RelatedPartyDomain_79d7640d-0162-4595-9f43-c7c7cd3989ef" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyMember_f1f92f60-e0d7-4a3b-9413-bb946f2800f0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_79d7640d-0162-4595-9f43-c7c7cd3989ef" xlink:to="loc_us-gaap_RelatedPartyMember_f1f92f60-e0d7-4a3b-9413-bb946f2800f0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_6b12f2da-131d-4c08-b138-980ce3152691" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAccountsNotesLoansAndFinancingReceivableTable_930b10eb-2be9-41a0-9051-24edf84db856" xlink:to="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_6b12f2da-131d-4c08-b138-980ce3152691" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_6b12f2da-131d-4c08-b138-980ce3152691_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LegalEntityTypeOfCounterpartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_6b12f2da-131d-4c08-b138-980ce3152691" xlink:to="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_6b12f2da-131d-4c08-b138-980ce3152691_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_62f2400c-a144-4b15-ae16-2d834b457982" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LegalEntityTypeOfCounterpartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AccountsNotesLoansAndFinancingReceivablesByLegalEntityOfCounterpartyTypeAxis_6b12f2da-131d-4c08-b138-980ce3152691" xlink:to="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_62f2400c-a144-4b15-ae16-2d834b457982" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_FlashPartnersLtdMember_cfe990ab-daee-4452-8491-60c0c1ffb04f" xlink:href="wdc-20230630.xsd#wdc_FlashPartnersLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_62f2400c-a144-4b15-ae16-2d834b457982" xlink:to="loc_wdc_FlashPartnersLtdMember_cfe990ab-daee-4452-8491-60c0c1ffb04f" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_FlashAllianceLtdMember_bbc37dde-e903-4dd0-b50b-5e03acb5f096" xlink:href="wdc-20230630.xsd#wdc_FlashAllianceLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_62f2400c-a144-4b15-ae16-2d834b457982" xlink:to="loc_wdc_FlashAllianceLtdMember_bbc37dde-e903-4dd0-b50b-5e03acb5f096" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_FlashForwardLtdMember_345129b6-f55f-4163-8a19-f411b22cc111" xlink:href="wdc-20230630.xsd#wdc_FlashForwardLtdMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_62f2400c-a144-4b15-ae16-2d834b457982" xlink:to="loc_wdc_FlashForwardLtdMember_345129b6-f55f-4163-8a19-f411b22cc111" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_538c4bb5-203c-412a-b41e-256d96863f92" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LegalEntityTypeOfCounterpartyDomain_62f2400c-a144-4b15-ae16-2d834b457982" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_538c4bb5-203c-412a-b41e-256d96863f92" xlink:type="arc" order="3"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/RelatedPartiesandRelatedCommitmentsandContingenciesMaximumLossExposureDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#RelatedPartiesandRelatedCommitmentsandContingenciesMaximumLossExposureDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/RelatedPartiesandRelatedCommitmentsandContingenciesMaximumLossExposureDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsLineItems_2509dfea-f14a-458f-ab2b-bb778d8ae880" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_1c1261f4-ae5e-415e-9774-ccd2c49d2137" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_2509dfea-f14a-458f-ab2b-bb778d8ae880" xlink:to="loc_us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount_1c1261f4-ae5e-415e-9774-ccd2c49d2137" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_eff286e6-a209-4351-922d-e23323d04af6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_2509dfea-f14a-458f-ab2b-bb778d8ae880" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_eff286e6-a209-4351-922d-e23323d04af6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_InventoryGross_130e5f0f-5791-4425-b4ab-4523a7d16108" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_InventoryGross"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_2509dfea-f14a-458f-ab2b-bb778d8ae880" xlink:to="loc_us-gaap_InventoryGross_130e5f0f-5791-4425-b4ab-4523a7d16108" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_7ce9bb54-942e-40d1-b15d-de839d6bb4fb" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfGuaranteeObligationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_2509dfea-f14a-458f-ab2b-bb778d8ae880" xlink:to="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_7ce9bb54-942e-40d1-b15d-de839d6bb4fb" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_BalanceSheetInformationAxis_9aa0de47-2361-45fe-a6b9-ab91b2121f0d" xlink:href="wdc-20230630.xsd#wdc_BalanceSheetInformationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_7ce9bb54-942e-40d1-b15d-de839d6bb4fb" xlink:to="loc_wdc_BalanceSheetInformationAxis_9aa0de47-2361-45fe-a6b9-ab91b2121f0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_9aa0de47-2361-45fe-a6b9-ab91b2121f0d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wdc_BalanceSheetInformationAxis_9aa0de47-2361-45fe-a6b9-ab91b2121f0d" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_9aa0de47-2361-45fe-a6b9-ab91b2121f0d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_f505c620-35e5-40a7-a803-baea81c2d9e4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wdc_BalanceSheetInformationAxis_9aa0de47-2361-45fe-a6b9-ab91b2121f0d" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_f505c620-35e5-40a7-a803-baea81c2d9e4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NotesReceivableMember_4a0f9f4c-8358-4c53-9970-7413e465d98b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NotesReceivableMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f505c620-35e5-40a7-a803-baea81c2d9e4" xlink:to="loc_us-gaap_NotesReceivableMember_4a0f9f4c-8358-4c53-9970-7413e465d98b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvestmentsMember_74d768f9-4735-40ac-af87-fb3e7fe76dc6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvestmentsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f505c620-35e5-40a7-a803-baea81c2d9e4" xlink:to="loc_us-gaap_EquityMethodInvestmentsMember_74d768f9-4735-40ac-af87-fb3e7fe76dc6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_OffBalanceSheetGuaranteeMember_f07c8316-5668-42ff-8d7a-b53dacba4a04" xlink:href="wdc-20230630.xsd#wdc_OffBalanceSheetGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f505c620-35e5-40a7-a803-baea81c2d9e4" xlink:to="loc_wdc_OffBalanceSheetGuaranteeMember_f07c8316-5668-42ff-8d7a-b53dacba4a04" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_acd969d9-b6ac-42ac-be14-91a1f20d898e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_f505c620-35e5-40a7-a803-baea81c2d9e4" xlink:to="loc_us-gaap_PrepaidExpensesAndOtherCurrentAssetsMember_acd969d9-b6ac-42ac-be14-91a1f20d898e" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_8ae1e4af-bfd4-4401-9551-6ea4cfb79b3f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_7ce9bb54-942e-40d1-b15d-de839d6bb4fb" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_8ae1e4af-bfd4-4401-9551-6ea4cfb79b3f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_8ae1e4af-bfd4-4401-9551-6ea4cfb79b3f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_8ae1e4af-bfd4-4401-9551-6ea4cfb79b3f" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_8ae1e4af-bfd4-4401-9551-6ea4cfb79b3f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_e8f32eab-3f23-40dc-9361-1699df61a842" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_8ae1e4af-bfd4-4401-9551-6ea4cfb79b3f" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_e8f32eab-3f23-40dc-9361-1699df61a842" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_b3c2a773-3a9a-4fc9-ad4a-dae9de43506e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_e8f32eab-3f23-40dc-9361-1699df61a842" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_b3c2a773-3a9a-4fc9-ad4a-dae9de43506e" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/RelatedPartiesandRelatedCommitmentsandContingenciesJVLeaseGuaranteesDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#RelatedPartiesandRelatedCommitmentsandContingenciesJVLeaseGuaranteesDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/RelatedPartiesandRelatedCommitmentsandContingenciesJVLeaseGuaranteesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesLineItems_caca6b13-f5f0-4802-8e94-fafc7f3ae29e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingenciesLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_7d59541f-20cf-4cee-abe0-9335d21397bd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LossContingenciesLineItems_caca6b13-f5f0-4802-8e94-fafc7f3ae29e" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_7d59541f-20cf-4cee-abe0-9335d21397bd" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LossContingenciesTable_fb078ab1-eaf5-4ca4-af6c-6f0523f55f48" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LossContingenciesTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_LossContingenciesLineItems_caca6b13-f5f0-4802-8e94-fafc7f3ae29e" xlink:to="loc_us-gaap_LossContingenciesTable_fb078ab1-eaf5-4ca4-af6c-6f0523f55f48" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_BalanceSheetInformationAxis_74af0fe9-682d-4ddd-b6c8-7996eab37ad5" xlink:href="wdc-20230630.xsd#wdc_BalanceSheetInformationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_fb078ab1-eaf5-4ca4-af6c-6f0523f55f48" xlink:to="loc_wdc_BalanceSheetInformationAxis_74af0fe9-682d-4ddd-b6c8-7996eab37ad5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_74af0fe9-682d-4ddd-b6c8-7996eab37ad5_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wdc_BalanceSheetInformationAxis_74af0fe9-682d-4ddd-b6c8-7996eab37ad5" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_74af0fe9-682d-4ddd-b6c8-7996eab37ad5_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_BalanceSheetLocationDomain_e845be38-4473-42f0-b21a-904ef881f8be" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_BalanceSheetLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wdc_BalanceSheetInformationAxis_74af0fe9-682d-4ddd-b6c8-7996eab37ad5" xlink:to="loc_us-gaap_BalanceSheetLocationDomain_e845be38-4473-42f0-b21a-904ef881f8be" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_OffBalanceSheetGuaranteeMember_d58ab690-ace7-423c-9407-7a945b3e0007" xlink:href="wdc-20230630.xsd#wdc_OffBalanceSheetGuaranteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_BalanceSheetLocationDomain_e845be38-4473-42f0-b21a-904ef881f8be" xlink:to="loc_wdc_OffBalanceSheetGuaranteeMember_d58ab690-ace7-423c-9407-7a945b3e0007" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionAxis_690274b1-5a05-47df-9eec-ce5377142ac2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_LossContingenciesTable_fb078ab1-eaf5-4ca4-af6c-6f0523f55f48" xlink:to="loc_us-gaap_RelatedPartyTransactionAxis_690274b1-5a05-47df-9eec-ce5377142ac2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_690274b1-5a05-47df-9eec-ce5377142ac2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_690274b1-5a05-47df-9eec-ce5377142ac2" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_690274b1-5a05-47df-9eec-ce5377142ac2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionDomain_fbe04e4f-5a56-454c-a9e6-4fe3c41cb6d9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionAxis_690274b1-5a05-47df-9eec-ce5377142ac2" xlink:to="loc_us-gaap_RelatedPartyTransactionDomain_fbe04e4f-5a56-454c-a9e6-4fe3c41cb6d9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_c7650f75-8909-445a-a74b-3aa651ef87fc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyTransactionDomain_fbe04e4f-5a56-454c-a9e6-4fe3c41cb6d9" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_c7650f75-8909-445a-a74b-3aa651ef87fc" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/RelatedPartiesandRelatedCommitmentsandContingenciesJointVentureLeaseAmountsDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#RelatedPartiesandRelatedCommitmentsandContingenciesJointVentureLeaseAmountsDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/RelatedPartiesandRelatedCommitmentsandContingenciesJointVentureLeaseAmountsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsLineItems_5943768f-da85-498b-b79f-ff62b946d8c7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_GuaranteeObligationsMaximumExposureYearOne_a7175958-23ae-4e13-8e62-d725d33c76df" xlink:href="wdc-20230630.xsd#wdc_GuaranteeObligationsMaximumExposureYearOne"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_5943768f-da85-498b-b79f-ff62b946d8c7" xlink:to="loc_wdc_GuaranteeObligationsMaximumExposureYearOne_a7175958-23ae-4e13-8e62-d725d33c76df" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_GuaranteeObligationsMaximumExposureYearTwo_33f1123e-70ca-4f9f-8b2b-c0ee4549dc1f" xlink:href="wdc-20230630.xsd#wdc_GuaranteeObligationsMaximumExposureYearTwo"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_5943768f-da85-498b-b79f-ff62b946d8c7" xlink:to="loc_wdc_GuaranteeObligationsMaximumExposureYearTwo_33f1123e-70ca-4f9f-8b2b-c0ee4549dc1f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_GuaranteeObligationsMaximumExposureYearThree_2e063abe-4b19-487b-9e69-8aa170bf5f32" xlink:href="wdc-20230630.xsd#wdc_GuaranteeObligationsMaximumExposureYearThree"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_5943768f-da85-498b-b79f-ff62b946d8c7" xlink:to="loc_wdc_GuaranteeObligationsMaximumExposureYearThree_2e063abe-4b19-487b-9e69-8aa170bf5f32" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_GuaranteeObligationsMaximumExposureYearFour_53adbf81-e4f4-4b85-9f40-7d492ab362e9" xlink:href="wdc-20230630.xsd#wdc_GuaranteeObligationsMaximumExposureYearFour"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_5943768f-da85-498b-b79f-ff62b946d8c7" xlink:to="loc_wdc_GuaranteeObligationsMaximumExposureYearFour_53adbf81-e4f4-4b85-9f40-7d492ab362e9" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_GuaranteeObligationsMaximumExposureYearFiveAndThereafter_ff0843d8-8c65-4b2f-a3c6-97a89bd950a7" xlink:href="wdc-20230630.xsd#wdc_GuaranteeObligationsMaximumExposureYearFiveAndThereafter"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_5943768f-da85-498b-b79f-ff62b946d8c7" xlink:to="loc_wdc_GuaranteeObligationsMaximumExposureYearFiveAndThereafter_ff0843d8-8c65-4b2f-a3c6-97a89bd950a7" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsMaximumExposure_7afeee04-bcf4-4d26-b7f7-6ef5c8e3f28c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsMaximumExposure"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_5943768f-da85-498b-b79f-ff62b946d8c7" xlink:to="loc_us-gaap_GuaranteeObligationsMaximumExposure_7afeee04-bcf4-4d26-b7f7-6ef5c8e3f28c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_b50ef9f1-ba5b-4ed0-b090-4165261ae751" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfGuaranteeObligationsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_GuaranteeObligationsLineItems_5943768f-da85-498b-b79f-ff62b946d8c7" xlink:to="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_b50ef9f1-ba5b-4ed0-b090-4165261ae751" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_43b2145d-fc74-4674-8616-8145f4ef7141" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyTransactionsByRelatedPartyAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_b50ef9f1-ba5b-4ed0-b090-4165261ae751" xlink:to="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_43b2145d-fc74-4674-8616-8145f4ef7141" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_43b2145d-fc74-4674-8616-8145f4ef7141_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_43b2145d-fc74-4674-8616-8145f4ef7141" xlink:to="loc_us-gaap_RelatedPartyDomain_43b2145d-fc74-4674-8616-8145f4ef7141_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RelatedPartyDomain_f035525a-f460-443f-a286-13a78d8af12b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RelatedPartyDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RelatedPartyTransactionsByRelatedPartyAxis_43b2145d-fc74-4674-8616-8145f4ef7141" xlink:to="loc_us-gaap_RelatedPartyDomain_f035525a-f460-443f-a286-13a78d8af12b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityMethodInvesteeMember_2805f28d-7eb4-41a0-9a01-86d4497e2465" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityMethodInvesteeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RelatedPartyDomain_f035525a-f460-443f-a286-13a78d8af12b" xlink:to="loc_us-gaap_EquityMethodInvesteeMember_2805f28d-7eb4-41a0-9a01-86d4497e2465" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsByNatureAxis_5904609d-2d97-42a6-94b5-3af1e8e5edc2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsByNatureAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfGuaranteeObligationsTable_b50ef9f1-ba5b-4ed0-b090-4165261ae751" xlink:to="loc_us-gaap_GuaranteeObligationsByNatureAxis_5904609d-2d97-42a6-94b5-3af1e8e5edc2" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_5904609d-2d97-42a6-94b5-3af1e8e5edc2_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_5904609d-2d97-42a6-94b5-3af1e8e5edc2" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_5904609d-2d97-42a6-94b5-3af1e8e5edc2_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GuaranteeObligationsNatureDomain_13d43ae8-2760-4355-baa0-16c50ed8d8e6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GuaranteeObligationsNatureDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_GuaranteeObligationsByNatureAxis_5904609d-2d97-42a6-94b5-3af1e8e5edc2" xlink:to="loc_us-gaap_GuaranteeObligationsNatureDomain_13d43ae8-2760-4355-baa0-16c50ed8d8e6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PaymentOfPrincipalAmortizationMember_6672525d-6d51-4f86-b6eb-a68136e18e1c" xlink:href="wdc-20230630.xsd#wdc_PaymentOfPrincipalAmortizationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_13d43ae8-2760-4355-baa0-16c50ed8d8e6" xlink:to="loc_wdc_PaymentOfPrincipalAmortizationMember_6672525d-6d51-4f86-b6eb-a68136e18e1c" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PurchaseOptionExercisePriceMember_280d0cca-81c0-49fe-aed6-ec470a089d88" xlink:href="wdc-20230630.xsd#wdc_PurchaseOptionExercisePriceMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_GuaranteeObligationsNatureDomain_13d43ae8-2760-4355-baa0-16c50ed8d8e6" xlink:to="loc_wdc_PurchaseOptionExercisePriceMember_280d0cca-81c0-49fe-aed6-ec470a089d88" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/WesternDigitalCorporation401kPlanAdditionalInformationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#WesternDigitalCorporation401kPlanAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/WesternDigitalCorporation401kPlanAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64786fa-2555-4c9c-92cf-5ba932b582e7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedBenefitPlanDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent_7172254a-7bb6-4806-ac21-0ba9f55fcb69" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64786fa-2555-4c9c-92cf-5ba932b582e7" xlink:to="loc_us-gaap_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent_7172254a-7bb6-4806-ac21-0ba9f55fcb69" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_4e9a0090-28af-46a5-8468-dfe9abd3aa6b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64786fa-2555-4c9c-92cf-5ba932b582e7" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercentOfMatch_4e9a0090-28af-46a5-8468-dfe9abd3aa6b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_f636ca39-1d57-4057-a841-72104a61c6f7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64786fa-2555-4c9c-92cf-5ba932b582e7" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent_f636ca39-1d57-4057-a841-72104a61c6f7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_91c0ccf1-bab5-4501-abfe-4d5eb9317f16" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64786fa-2555-4c9c-92cf-5ba932b582e7" xlink:to="loc_us-gaap_DefinedContributionPlanEmployerDiscretionaryContributionAmount_91c0ccf1-bab5-4501-abfe-4d5eb9317f16" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_7934ac28-7b4e-45b1-8834-ea80e6c0201d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_DefinedBenefitPlanDisclosureLineItems_e64786fa-2555-4c9c-92cf-5ba932b582e7" xlink:to="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_7934ac28-7b4e-45b1-8834-ea80e6c0201d" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TaxScenarioAxis_f0695f25-a8b6-4e40-8ecd-1dd4f9c868d7" xlink:href="wdc-20230630.xsd#wdc_TaxScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfDefinedBenefitPlansDisclosuresTable_7934ac28-7b4e-45b1-8834-ea80e6c0201d" xlink:to="loc_wdc_TaxScenarioAxis_f0695f25-a8b6-4e40-8ecd-1dd4f9c868d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TaxScenarioDomain_f0695f25-a8b6-4e40-8ecd-1dd4f9c868d7_default" xlink:href="wdc-20230630.xsd#wdc_TaxScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wdc_TaxScenarioAxis_f0695f25-a8b6-4e40-8ecd-1dd4f9c868d7" xlink:to="loc_wdc_TaxScenarioDomain_f0695f25-a8b6-4e40-8ecd-1dd4f9c868d7_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TaxScenarioDomain_44b395a3-687e-415a-aa4d-169c6ffa9c16" xlink:href="wdc-20230630.xsd#wdc_TaxScenarioDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wdc_TaxScenarioAxis_f0695f25-a8b6-4e40-8ecd-1dd4f9c868d7" xlink:to="loc_wdc_TaxScenarioDomain_44b395a3-687e-415a-aa4d-169c6ffa9c16" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PreTaxMember_8009f0b7-20fc-458d-9b52-79edf90be52e" xlink:href="wdc-20230630.xsd#wdc_PreTaxMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_TaxScenarioDomain_44b395a3-687e-415a-aa4d-169c6ffa9c16" xlink:to="loc_wdc_PreTaxMember_8009f0b7-20fc-458d-9b52-79edf90be52e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PreTaxCatchUpMember_28296cab-59a3-465d-a8d8-580a62dd1b0e" xlink:href="wdc-20230630.xsd#wdc_PreTaxCatchUpMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_TaxScenarioDomain_44b395a3-687e-415a-aa4d-169c6ffa9c16" xlink:to="loc_wdc_PreTaxCatchUpMember_28296cab-59a3-465d-a8d8-580a62dd1b0e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PostTaxMember_7516e773-2cf2-41db-ba80-f606b4d1c006" xlink:href="wdc-20230630.xsd#wdc_PostTaxMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_TaxScenarioDomain_44b395a3-687e-415a-aa4d-169c6ffa9c16" xlink:to="loc_wdc_PostTaxMember_7516e773-2cf2-41db-ba80-f606b4d1c006" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStock2021LongTermIncentivePlanandESPPDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#ShareholdersEquityandConvertiblePreferredStock2021LongTermIncentivePlanandESPPDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStock2021LongTermIncentivePlanandESPPDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5eb24d00-4261-4ffa-a2d1-158580c19d03" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_5eb24d00-4261-4ffa-a2d1-158580c19d03" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_2bbb9ed6-b879-4e4f-86cd-a795afbad21f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_2bbb9ed6-b879-4e4f-86cd-a795afbad21f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_2ce62baa-9eba-4aa3-8093-371bb7c7fbaf" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardExpirationPeriod_2ce62baa-9eba-4aa3-8093-371bb7c7fbaf" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_309e5489-0c42-4629-a4bc-7c660ec9b4a3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1_309e5489-0c42-4629-a4bc-7c660ec9b4a3" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_7dde58ef-548e-4634-96e0-7f25dd70549b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_NumberOfSharesToBeIssuedForEveryOneShareActuallyIssuedInConnectionWithAward_a834d445-86c2-438b-b897-cfbb1293303c" xlink:href="wdc-20230630.xsd#wdc_NumberOfSharesToBeIssuedForEveryOneShareActuallyIssuedInConnectionWithAward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_wdc_NumberOfSharesToBeIssuedForEveryOneShareActuallyIssuedInConnectionWithAward_a834d445-86c2-438b-b897-cfbb1293303c" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_aafe70b9-002a-47d9-aa43-e60ba84351ef" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardMaximumEmployeeSubscriptionRate_aafe70b9-002a-47d9-aa43-e60ba84351ef" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_93fd8d63-ddab-407a-8afb-e1dfd330690d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardPurchasePriceOfCommonStockPercent_93fd8d63-ddab-407a-8afb-e1dfd330690d" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardConsecutiveOfferingPeriod_9d83c51c-3673-49a8-80d6-f45ada4cf06d" xlink:href="wdc-20230630.xsd#wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardConsecutiveOfferingPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardConsecutiveOfferingPeriod_9d83c51c-3673-49a8-80d6-f45ada4cf06d" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPurchasePeriods_03a231e2-88d8-436e-80ff-ad68b11acaec" xlink:href="wdc-20230630.xsd#wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPurchasePeriods"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfPurchasePeriods_03a231e2-88d8-436e-80ff-ad68b11acaec" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePeriod_d8226dd0-2cf4-477a-ab5c-68a8d7086339" xlink:href="wdc-20230630.xsd#wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardPurchasePeriod_d8226dd0-2cf4-477a-ab5c-68a8d7086339" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_b9950cb3-b428-472d-9e32-2c0019cf3a05" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_us-gaap_StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans_b9950cb3-b428-472d-9e32-2c0019cf3a05" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_55431b8a-8fce-4d0d-b41c-f17e0ae22e44" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_us-gaap_StockIssuedDuringPeriodValueEmployeeStockPurchasePlan_55431b8a-8fce-4d0d-b41c-f17e0ae22e44" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_62615a3d-e031-4307-bfc1-2d97fa2c7b15" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_bbdcc645-022f-4cd2-b235-ea9c5f488472" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_62615a3d-e031-4307-bfc1-2d97fa2c7b15" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_2e715d44-3289-4316-bda7-d2d761fad20d" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_62615a3d-e031-4307-bfc1-2d97fa2c7b15" xlink:to="loc_srt_RangeAxis_2e715d44-3289-4316-bda7-d2d761fad20d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_2e715d44-3289-4316-bda7-d2d761fad20d_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_2e715d44-3289-4316-bda7-d2d761fad20d" xlink:to="loc_srt_RangeMember_2e715d44-3289-4316-bda7-d2d761fad20d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_41f63c57-2315-4f72-81b8-49d44ce5aca3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_2e715d44-3289-4316-bda7-d2d761fad20d" xlink:to="loc_srt_RangeMember_41f63c57-2315-4f72-81b8-49d44ce5aca3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_fdff5e1d-8ed3-4ea4-9f7e-1d17f0e615a6" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_41f63c57-2315-4f72-81b8-49d44ce5aca3" xlink:to="loc_srt_MinimumMember_fdff5e1d-8ed3-4ea4-9f7e-1d17f0e615a6" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_f512de2a-1966-4d4e-bf6b-dfe7d2ad4be7" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_41f63c57-2315-4f72-81b8-49d44ce5aca3" xlink:to="loc_srt_MaximumMember_f512de2a-1966-4d4e-bf6b-dfe7d2ad4be7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_9efc3c8e-893e-458e-8939-9c4e0a7810af" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_62615a3d-e031-4307-bfc1-2d97fa2c7b15" xlink:to="loc_us-gaap_AwardTypeAxis_9efc3c8e-893e-458e-8939-9c4e0a7810af" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9efc3c8e-893e-458e-8939-9c4e0a7810af_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_9efc3c8e-893e-458e-8939-9c4e0a7810af" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9efc3c8e-893e-458e-8939-9c4e0a7810af_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0c0b5522-f0ba-4537-9051-367521231e0d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_9efc3c8e-893e-458e-8939-9c4e0a7810af" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0c0b5522-f0ba-4537-9051-367521231e0d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember_19dca206-185c-4ebc-9d25-8eccaf15e24b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0c0b5522-f0ba-4537-9051-367521231e0d" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember_19dca206-185c-4ebc-9d25-8eccaf15e24b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockOptionMember_d5a94143-1743-4980-a4af-02a37188c6d3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockOptionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0c0b5522-f0ba-4537-9051-367521231e0d" xlink:to="loc_us-gaap_EmployeeStockOptionMember_d5a94143-1743-4980-a4af-02a37188c6d3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember_fb812241-344f-436a-9de1-c08313035f69" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_0c0b5522-f0ba-4537-9051-367521231e0d" xlink:to="loc_us-gaap_EmployeeStockMember_fb812241-344f-436a-9de1-c08313035f69" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameAxis_36ddee0f-144c-4647-91b0-e2b90bfbc4db" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_62615a3d-e031-4307-bfc1-2d97fa2c7b15" xlink:to="loc_us-gaap_PlanNameAxis_36ddee0f-144c-4647-91b0-e2b90bfbc4db" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_36ddee0f-144c-4647-91b0-e2b90bfbc4db_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_PlanNameAxis_36ddee0f-144c-4647-91b0-e2b90bfbc4db" xlink:to="loc_us-gaap_PlanNameDomain_36ddee0f-144c-4647-91b0-e2b90bfbc4db_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PlanNameDomain_fc34f108-d289-4d02-85fc-93332bb7ee3f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_PlanNameAxis_36ddee0f-144c-4647-91b0-e2b90bfbc4db" xlink:to="loc_us-gaap_PlanNameDomain_fc34f108-d289-4d02-85fc-93332bb7ee3f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_A2021LongTermIncentivePlanMember_45d6bad9-d035-478b-bd0f-a7254a47b5f3" xlink:href="wdc-20230630.xsd#wdc_A2021LongTermIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_fc34f108-d289-4d02-85fc-93332bb7ee3f" xlink:to="loc_wdc_A2021LongTermIncentivePlanMember_45d6bad9-d035-478b-bd0f-a7254a47b5f3" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_A2017LongTermIncentivePlanMember_fbfffbbc-bbf6-476d-8cd5-bd7a83114ea7" xlink:href="wdc-20230630.xsd#wdc_A2017LongTermIncentivePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_PlanNameDomain_fc34f108-d289-4d02-85fc-93332bb7ee3f" xlink:to="loc_wdc_A2017LongTermIncentivePlanMember_fbfffbbc-bbf6-476d-8cd5-bd7a83114ea7" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockStockBasedCompensationExpenseDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#ShareholdersEquityandConvertiblePreferredStockStockBasedCompensationExpenseDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockStockBasedCompensationExpenseDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_21019575-c8d5-4bb3-89b7-902300a9bb3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpense_9fac4b45-e3ca-4cc1-a431-1252e4923f68" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_21019575-c8d5-4bb3-89b7-902300a9bb3e" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpense_9fac4b45-e3ca-4cc1-a431-1252e4923f68" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_34764a59-027d-446b-af15-9d7f8e4a6a70" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_21019575-c8d5-4bb3-89b7-902300a9bb3e" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense_34764a59-027d-446b-af15-9d7f8e4a6a70" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_fd68fee4-8d0d-457b-aeeb-ce5a68e35243" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_21019575-c8d5-4bb3-89b7-902300a9bb3e" xlink:to="loc_us-gaap_AllocatedShareBasedCompensationExpenseNetOfTax_fd68fee4-8d0d-457b-aeeb-ce5a68e35243" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_89589c5d-307b-4050-a22f-f1fdf003931b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_21019575-c8d5-4bb3-89b7-902300a9bb3e" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_89589c5d-307b-4050-a22f-f1fdf003931b" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_ddf3c43c-a8e5-4fb7-adf9-883cc5c16f18" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_89589c5d-307b-4050-a22f-f1fdf003931b" xlink:to="loc_us-gaap_AwardTypeAxis_ddf3c43c-a8e5-4fb7-adf9-883cc5c16f18" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ddf3c43c-a8e5-4fb7-adf9-883cc5c16f18_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_ddf3c43c-a8e5-4fb7-adf9-883cc5c16f18" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_ddf3c43c-a8e5-4fb7-adf9-883cc5c16f18_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_57cee1fd-f1b0-4d82-b53f-bcc615b1138a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_ddf3c43c-a8e5-4fb7-adf9-883cc5c16f18" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_57cee1fd-f1b0-4d82-b53f-bcc615b1138a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_RestrictedStockUnitsAndPerformanceStockUnitsMember_a6c3827b-9705-41e6-81c6-8bb9f0266b0b" xlink:href="wdc-20230630.xsd#wdc_RestrictedStockUnitsAndPerformanceStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_57cee1fd-f1b0-4d82-b53f-bcc615b1138a" xlink:to="loc_wdc_RestrictedStockUnitsAndPerformanceStockUnitsMember_a6c3827b-9705-41e6-81c6-8bb9f0266b0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_EmployeeStockPurchasePlanMember_f56c9502-d689-486b-a51f-2f38b8721754" xlink:href="wdc-20230630.xsd#wdc_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_57cee1fd-f1b0-4d82-b53f-bcc615b1138a" xlink:to="loc_wdc_EmployeeStockPurchasePlanMember_f56c9502-d689-486b-a51f-2f38b8721754" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationAxis_c72389c5-7249-4a76-a67d-15e4daa3483f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_89589c5d-307b-4050-a22f-f1fdf003931b" xlink:to="loc_us-gaap_IncomeStatementLocationAxis_c72389c5-7249-4a76-a67d-15e4daa3483f" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_c72389c5-7249-4a76-a67d-15e4daa3483f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_c72389c5-7249-4a76-a67d-15e4daa3483f" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_c72389c5-7249-4a76-a67d-15e4daa3483f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeStatementLocationDomain_2392ce14-7fe1-49c6-8e4c-7e8a02af02f3" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeStatementLocationDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeStatementLocationAxis_c72389c5-7249-4a76-a67d-15e4daa3483f" xlink:to="loc_us-gaap_IncomeStatementLocationDomain_2392ce14-7fe1-49c6-8e4c-7e8a02af02f3" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CostOfSalesMember_f7b01062-4780-4f82-a200-b39a2afe639d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CostOfSalesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_2392ce14-7fe1-49c6-8e4c-7e8a02af02f3" xlink:to="loc_us-gaap_CostOfSalesMember_f7b01062-4780-4f82-a200-b39a2afe639d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ResearchAndDevelopmentExpenseMember_000f028f-fa74-4a30-b168-1a390643107e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ResearchAndDevelopmentExpenseMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_2392ce14-7fe1-49c6-8e4c-7e8a02af02f3" xlink:to="loc_us-gaap_ResearchAndDevelopmentExpenseMember_000f028f-fa74-4a30-b168-1a390643107e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_82da4da1-ca1e-4499-9dcd-0b6f21bb1d2b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SellingGeneralAndAdministrativeExpensesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeStatementLocationDomain_2392ce14-7fe1-49c6-8e4c-7e8a02af02f3" xlink:to="loc_us-gaap_SellingGeneralAndAdministrativeExpensesMember_82da4da1-ca1e-4499-9dcd-0b6f21bb1d2b" xlink:type="arc" order="2"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockUnrecognizedSharebasedCompensationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#ShareholdersEquityandConvertiblePreferredStockUnrecognizedSharebasedCompensationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockUnrecognizedSharebasedCompensationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wdc_EmployeeServiceSharebasedCompensationUnrecognizedServiceCostsLineItems_382ff195-38ad-4cc5-bc13-28d8ae4b40ea" xlink:href="wdc-20230630.xsd#wdc_EmployeeServiceSharebasedCompensationUnrecognizedServiceCostsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_9af3b861-e265-4576-8543-4aa4496b1ce9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_EmployeeServiceSharebasedCompensationUnrecognizedServiceCostsLineItems_382ff195-38ad-4cc5-bc13-28d8ae4b40ea" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized_9af3b861-e265-4576-8543-4aa4496b1ce9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_054ef488-f5d3-4485-874e-b38f73923587" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_EmployeeServiceSharebasedCompensationUnrecognizedServiceCostsLineItems_382ff195-38ad-4cc5-bc13-28d8ae4b40ea" xlink:to="loc_us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1_054ef488-f5d3-4485-874e-b38f73923587" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_EmployeeServiceSharebasedCompensationUnrecognizedServiceCostsTable_63a98d56-5c3e-4e43-a9f6-864e8853e0f8" xlink:href="wdc-20230630.xsd#wdc_EmployeeServiceSharebasedCompensationUnrecognizedServiceCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wdc_EmployeeServiceSharebasedCompensationUnrecognizedServiceCostsLineItems_382ff195-38ad-4cc5-bc13-28d8ae4b40ea" xlink:to="loc_wdc_EmployeeServiceSharebasedCompensationUnrecognizedServiceCostsTable_63a98d56-5c3e-4e43-a9f6-864e8853e0f8" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_9acc5ab3-a1e0-4f93-a553-ea160fc71f28" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_EmployeeServiceSharebasedCompensationUnrecognizedServiceCostsTable_63a98d56-5c3e-4e43-a9f6-864e8853e0f8" xlink:to="loc_us-gaap_AwardTypeAxis_9acc5ab3-a1e0-4f93-a553-ea160fc71f28" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9acc5ab3-a1e0-4f93-a553-ea160fc71f28_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_9acc5ab3-a1e0-4f93-a553-ea160fc71f28" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_9acc5ab3-a1e0-4f93-a553-ea160fc71f28_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_eefa70f7-63e0-465f-869b-b89b77fa9a1b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_9acc5ab3-a1e0-4f93-a553-ea160fc71f28" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_eefa70f7-63e0-465f-869b-b89b77fa9a1b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_RestrictedStockUnitsAndPerformanceStockUnitsMember_87a06435-f975-42ae-84af-3feb2807ea2e" xlink:href="wdc-20230630.xsd#wdc_RestrictedStockUnitsAndPerformanceStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_eefa70f7-63e0-465f-869b-b89b77fa9a1b" xlink:to="loc_wdc_RestrictedStockUnitsAndPerformanceStockUnitsMember_87a06435-f975-42ae-84af-3feb2807ea2e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_EmployeeStockPurchasePlanMember_b185f8b0-de38-4186-9e58-fdbb4c22f4d0" xlink:href="wdc-20230630.xsd#wdc_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_eefa70f7-63e0-465f-869b-b89b77fa9a1b" xlink:to="loc_wdc_EmployeeStockPurchasePlanMember_b185f8b0-de38-4186-9e58-fdbb4c22f4d0" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockRestrictedStockUnitsAndPerformanceShareUnitsDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#ShareholdersEquityandConvertiblePreferredStockRestrictedStockUnitsAndPerformanceShareUnitsDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockRestrictedStockUnitsAndPerformanceShareUnitsDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7185153-92f7-45e5-a960-609c0a17ed2a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1918d367-502d-45f5-86ef-adaceebeb031" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7185153-92f7-45e5-a960-609c0a17ed2a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1918d367-502d-45f5-86ef-adaceebeb031" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_bebc77e9-5ca7-4750-89f3-ff4c37f8d636" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1918d367-502d-45f5-86ef-adaceebeb031" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_bebc77e9-5ca7-4750-89f3-ff4c37f8d636" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_86b7b182-08ab-48b4-b9c6-7cfda591fc06" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1918d367-502d-45f5-86ef-adaceebeb031" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod_86b7b182-08ab-48b4-b9c6-7cfda591fc06" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_8141c7e3-c12c-4004-beae-d19ef600ba79" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1918d367-502d-45f5-86ef-adaceebeb031" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod_8141c7e3-c12c-4004-beae-d19ef600ba79" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_bd9d2582-e545-4b27-aad6-6a3d0f03552f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedRollForward_1918d367-502d-45f5-86ef-adaceebeb031" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod_bd9d2582-e545-4b27-aad6-6a3d0f03552f" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber_790bdd6c-3101-4e64-95c1-130c8382dffd" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_eeb0ebe5-d787-46c8-bf7c-2a43a7563f3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7185153-92f7-45e5-a960-609c0a17ed2a" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_eeb0ebe5-d787-46c8-bf7c-2a43a7563f3e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_42b83ed2-9698-4631-95da-52943cfd290b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_eeb0ebe5-d787-46c8-bf7c-2a43a7563f3e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_42b83ed2-9698-4631-95da-52943cfd290b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_501d9659-82e5-4c3e-83d0-a990ba69b944" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_eeb0ebe5-d787-46c8-bf7c-2a43a7563f3e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_501d9659-82e5-4c3e-83d0-a990ba69b944" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_55d15a92-b090-47e8-9392-4ecaf3126f2f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_eeb0ebe5-d787-46c8-bf7c-2a43a7563f3e" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageGrantDateFairValue_55d15a92-b090-47e8-9392-4ecaf3126f2f" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardsEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue_46287641-8570-46c4-9f8d-17af42a915d8" xlink:href="wdc-20230630.xsd#wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardsEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValueRollForward_eeb0ebe5-d787-46c8-bf7c-2a43a7563f3e" xlink:to="loc_wdc_ShareBasedCompensationArrangementByShareBasedPaymentAwardsEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageGrantDateFairValue_46287641-8570-46c4-9f8d-17af42a915d8" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue_bca20172-e7f4-44f9-9192-01a3e5a00f93" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageGrantDateFairValue"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_AggregateValueOfRestrictedStockAwardsVested_c8d4c5c0-d85a-439a-af68-b9a246a3b150" xlink:href="wdc-20230630.xsd#wdc_AggregateValueOfRestrictedStockAwardsVested"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7185153-92f7-45e5-a960-609c0a17ed2a" xlink:to="loc_wdc_AggregateValueOfRestrictedStockAwardsVested_c8d4c5c0-d85a-439a-af68-b9a246a3b150" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0244dc56-2c61-4b32-af35-51892adb99df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_b7185153-92f7-45e5-a960-609c0a17ed2a" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0244dc56-2c61-4b32-af35-51892adb99df" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_fcb3015c-b6eb-456e-bc8f-b80848d2deee" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_0244dc56-2c61-4b32-af35-51892adb99df" xlink:to="loc_us-gaap_AwardTypeAxis_fcb3015c-b6eb-456e-bc8f-b80848d2deee" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fcb3015c-b6eb-456e-bc8f-b80848d2deee_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_fcb3015c-b6eb-456e-bc8f-b80848d2deee" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fcb3015c-b6eb-456e-bc8f-b80848d2deee_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fad3d965-9245-46df-8f35-f1ce051cb769" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_fcb3015c-b6eb-456e-bc8f-b80848d2deee" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fad3d965-9245-46df-8f35-f1ce051cb769" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_RestrictedStockUnitsAndPerformanceShareUnitsMember_f51fce3c-518f-4ad4-a120-916539410803" xlink:href="wdc-20230630.xsd#wdc_RestrictedStockUnitsAndPerformanceShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_fad3d965-9245-46df-8f35-f1ce051cb769" xlink:to="loc_wdc_RestrictedStockUnitsAndPerformanceShareUnitsMember_f51fce3c-518f-4ad4-a120-916539410803" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockFairValuesAssumptionsUserForEmployeeStockPurchasePlanGrantedDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#ShareholdersEquityandConvertiblePreferredStockFairValuesAssumptionsUserForEmployeeStockPurchasePlanGrantedDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockFairValuesAssumptionsUserForEmployeeStockPurchasePlanGrantedDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4dc6dfef-ac1c-4a56-a856-f85f727b5d2f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_fb3d674d-e204-428a-9eff-674153c2026d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4dc6dfef-ac1c-4a56-a856-f85f727b5d2f" xlink:to="loc_us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1_fb3d674d-e204-428a-9eff-674153c2026d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_4e3e78e6-b0d3-4575-8dc6-606b51bf7aed" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4dc6dfef-ac1c-4a56-a856-f85f727b5d2f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate_4e3e78e6-b0d3-4575-8dc6-606b51bf7aed" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_96b9ede8-cc6a-41db-96f8-5ea78c42a739" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4dc6dfef-ac1c-4a56-a856-f85f727b5d2f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate_96b9ede8-cc6a-41db-96f8-5ea78c42a739" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_03f4ba95-9cfb-4a1f-b0b1-3d6367772750" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4dc6dfef-ac1c-4a56-a856-f85f727b5d2f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate_03f4ba95-9cfb-4a1f-b0b1-3d6367772750" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_24c2de0b-6d9e-4c84-9aab-dcd79520076d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4dc6dfef-ac1c-4a56-a856-f85f727b5d2f" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue_24c2de0b-6d9e-4c84-9aab-dcd79520076d" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_18fbc95b-e4da-4042-a863-63fd76e681f2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_4dc6dfef-ac1c-4a56-a856-f85f727b5d2f" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_18fbc95b-e4da-4042-a863-63fd76e681f2" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_f6c2db49-5310-4c9e-86a0-ef8f7331c7de" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_18fbc95b-e4da-4042-a863-63fd76e681f2" xlink:to="loc_us-gaap_AwardTypeAxis_f6c2db49-5310-4c9e-86a0-ef8f7331c7de" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f6c2db49-5310-4c9e-86a0-ef8f7331c7de_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_f6c2db49-5310-4c9e-86a0-ef8f7331c7de" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_f6c2db49-5310-4c9e-86a0-ef8f7331c7de_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_65eb2fc4-94f4-4b61-98bb-6ab4919367e9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_f6c2db49-5310-4c9e-86a0-ef8f7331c7de" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_65eb2fc4-94f4-4b61-98bb-6ab4919367e9" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_EmployeeStockPurchasePlanMember_b6d04922-2a84-4e25-9e52-c262508f4f21" xlink:href="wdc-20230630.xsd#wdc_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_65eb2fc4-94f4-4b61-98bb-6ab4919367e9" xlink:to="loc_wdc_EmployeeStockPurchasePlanMember_b6d04922-2a84-4e25-9e52-c262508f4f21" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockConvertiblePreferredStockDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#ShareholdersEquityandConvertiblePreferredStockConvertiblePreferredStockDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockConvertiblePreferredStockDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquitySharesAuthorized_c0dfcb45-0e05-4981-ba46-eae308f22fb9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquitySharesAuthorized"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_us-gaap_TemporaryEquitySharesAuthorized_c0dfcb45-0e05-4981-ba46-eae308f22fb9" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare_ce1297d1-9e4e-4a27-92fd-516a55e0051e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityParOrStatedValuePerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_us-gaap_TemporaryEquityParOrStatedValuePerShare_ce1297d1-9e4e-4a27-92fd-516a55e0051e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_275565a5-b6ad-43b7-b356-ee9176411015" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ProceedsFromIssuanceOfPrivatePlacement"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_us-gaap_ProceedsFromIssuanceOfPrivatePlacement_275565a5-b6ad-43b7-b356-ee9176411015" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsOfStockIssuanceCosts_c7356530-b2c1-4c32-9b19-dd5f20b8207c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsOfStockIssuanceCosts"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_us-gaap_PaymentsOfStockIssuanceCosts_c7356530-b2c1-4c32-9b19-dd5f20b8207c" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TemporaryEquityPreferredStockDividendRatePercentage_2471cb79-010b-4cc4-8733-3e9eba948247" xlink:href="wdc-20230630.xsd#wdc_TemporaryEquityPreferredStockDividendRatePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_wdc_TemporaryEquityPreferredStockDividendRatePercentage_2471cb79-010b-4cc4-8733-3e9eba948247" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockAmountOfPreferredDividendsInArrears_8eac5750-f7d0-41e8-90ab-9e45ff8f06ce" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockAmountOfPreferredDividendsInArrears"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_us-gaap_PreferredStockAmountOfPreferredDividendsInArrears_8eac5750-f7d0-41e8-90ab-9e45ff8f06ce" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_CumulativeDividends_11d3dce1-b8ab-4152-9b8c-b347a236575b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_CumulativeDividends"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_us-gaap_CumulativeDividends_11d3dce1-b8ab-4152-9b8c-b347a236575b" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockConvertibleConversionPrice_bf15c854-cdae-4e11-9e85-810a91cb6c22" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockConvertibleConversionPrice"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_us-gaap_PreferredStockConvertibleConversionPrice_bf15c854-cdae-4e11-9e85-810a91cb6c22" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PreferredStockConvertibleConversionRatio_f4f05f58-a90c-4a7e-a307-90d840b8350f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PreferredStockConvertibleConversionRatio"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_us-gaap_PreferredStockConvertibleConversionRatio_f4f05f58-a90c-4a7e-a307-90d840b8350f" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PreferredStockConvertibleExtensionPeriod_e580ea72-9902-4521-864e-6a9f13eafe81" xlink:href="wdc-20230630.xsd#wdc_PreferredStockConvertibleExtensionPeriod"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_wdc_PreferredStockConvertibleExtensionPeriod_e580ea72-9902-4521-864e-6a9f13eafe81" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PreferredStockConvertibleConversionPricePercentage_1a6e1dd0-6965-4c2b-90f4-092cfa24eb23" xlink:href="wdc-20230630.xsd#wdc_PreferredStockConvertibleConversionPricePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_wdc_PreferredStockConvertibleConversionPricePercentage_1a6e1dd0-6965-4c2b-90f4-092cfa24eb23" xlink:type="arc" order="10"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PreferredStockConvertibleThresholdConsecutiveTradingDays_705942e6-a5bb-4584-aae8-9200690584eb" xlink:href="wdc-20230630.xsd#wdc_PreferredStockConvertibleThresholdConsecutiveTradingDays"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_wdc_PreferredStockConvertibleThresholdConsecutiveTradingDays_705942e6-a5bb-4584-aae8-9200690584eb" xlink:type="arc" order="11"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TemporaryEquitySharesConvertible_985e5728-b39c-4595-90b9-37ecfafaab94" xlink:href="wdc-20230630.xsd#wdc_TemporaryEquitySharesConvertible"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_wdc_TemporaryEquitySharesConvertible_985e5728-b39c-4595-90b9-37ecfafaab94" xlink:type="arc" order="12"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_PreferredStockRedemptionAccumulatedStatedValuePercentage_5d51690c-50cf-4c8a-bdc5-e71f44b1d8cf" xlink:href="wdc-20230630.xsd#wdc_PreferredStockRedemptionAccumulatedStatedValuePercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_wdc_PreferredStockRedemptionAccumulatedStatedValuePercentage_5d51690c-50cf-4c8a-bdc5-e71f44b1d8cf" xlink:type="arc" order="13"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TemporaryEquityLiquidationPreference_2aad8626-854c-4ce5-af4a-124cef31f30a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TemporaryEquityLiquidationPreference"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_us-gaap_TemporaryEquityLiquidationPreference_2aad8626-854c-4ce5-af4a-124cef31f30a" xlink:type="arc" order="14"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2527d3a-33a7-4188-97fc-dead97e95bfc" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_89914e7d-fc13-4467-b8cc-776cc0440945" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2527d3a-33a7-4188-97fc-dead97e95bfc" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StatementClassOfStockAxis_95b57492-8f50-4c4a-a013-d8d47cd3c57b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StatementClassOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2527d3a-33a7-4188-97fc-dead97e95bfc" xlink:to="loc_us-gaap_StatementClassOfStockAxis_95b57492-8f50-4c4a-a013-d8d47cd3c57b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_95b57492-8f50-4c4a-a013-d8d47cd3c57b_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_StatementClassOfStockAxis_95b57492-8f50-4c4a-a013-d8d47cd3c57b" xlink:to="loc_us-gaap_ClassOfStockDomain_95b57492-8f50-4c4a-a013-d8d47cd3c57b_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfStockDomain_ef71699d-50f7-4517-80fb-006a50dcc1fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfStockDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_StatementClassOfStockAxis_95b57492-8f50-4c4a-a013-d8d47cd3c57b" xlink:to="loc_us-gaap_ClassOfStockDomain_ef71699d-50f7-4517-80fb-006a50dcc1fa" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SeriesAPreferredStockMember_baa3a415-ad21-4c30-8b5c-592e587c904e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SeriesAPreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_ef71699d-50f7-4517-80fb-006a50dcc1fa" xlink:to="loc_us-gaap_SeriesAPreferredStockMember_baa3a415-ad21-4c30-8b5c-592e587c904e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertiblePreferredStockMember_e7994e1b-5021-4899-8902-65b3e5741c03" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertiblePreferredStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ClassOfStockDomain_ef71699d-50f7-4517-80fb-006a50dcc1fa" xlink:to="loc_us-gaap_ConvertiblePreferredStockMember_e7994e1b-5021-4899-8902-65b3e5741c03" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SubsidiarySaleOfStockAxis_809b69be-bae8-4963-bbf3-03cf28fa8b71" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SubsidiarySaleOfStockAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2527d3a-33a7-4188-97fc-dead97e95bfc" xlink:to="loc_us-gaap_SubsidiarySaleOfStockAxis_809b69be-bae8-4963-bbf3-03cf28fa8b71" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_809b69be-bae8-4963-bbf3-03cf28fa8b71_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_809b69be-bae8-4963-bbf3-03cf28fa8b71" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_809b69be-bae8-4963-bbf3-03cf28fa8b71_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_SaleOfStockNameOfTransactionDomain_336347bc-1608-4f95-ba37-f919b13382df" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_SaleOfStockNameOfTransactionDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_SubsidiarySaleOfStockAxis_809b69be-bae8-4963-bbf3-03cf28fa8b71" xlink:to="loc_us-gaap_SaleOfStockNameOfTransactionDomain_336347bc-1608-4f95-ba37-f919b13382df" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PrivatePlacementMember_e44901e2-87d8-4c85-9b04-02c7d151aa29" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PrivatePlacementMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_SaleOfStockNameOfTransactionDomain_336347bc-1608-4f95-ba37-f919b13382df" xlink:to="loc_us-gaap_PrivatePlacementMember_e44901e2-87d8-4c85-9b04-02c7d151aa29" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_7fe31b81-6fb6-461f-85a2-e7eaa88971b8" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2527d3a-33a7-4188-97fc-dead97e95bfc" xlink:to="loc_srt_RangeAxis_7fe31b81-6fb6-461f-85a2-e7eaa88971b8" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_7fe31b81-6fb6-461f-85a2-e7eaa88971b8_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_7fe31b81-6fb6-461f-85a2-e7eaa88971b8" xlink:to="loc_srt_RangeMember_7fe31b81-6fb6-461f-85a2-e7eaa88971b8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_785c7e98-12b9-47b0-8ae6-84e1dc43e387" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_7fe31b81-6fb6-461f-85a2-e7eaa88971b8" xlink:to="loc_srt_RangeMember_785c7e98-12b9-47b0-8ae6-84e1dc43e387" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_40c11154-93ba-4469-9b4b-83850bbd3232" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_785c7e98-12b9-47b0-8ae6-84e1dc43e387" xlink:to="loc_srt_MaximumMember_40c11154-93ba-4469-9b4b-83850bbd3232" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_8145ffa2-3480-476a-811e-d8663dd0e5d1" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_785c7e98-12b9-47b0-8ae6-84e1dc43e387" xlink:to="loc_srt_MinimumMember_8145ffa2-3480-476a-811e-d8663dd0e5d1" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DividendRateDateAxis_a2dbace8-57e3-4b0a-9596-9864e1c64399" xlink:href="wdc-20230630.xsd#wdc_DividendRateDateAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_b2527d3a-33a7-4188-97fc-dead97e95bfc" xlink:to="loc_wdc_DividendRateDateAxis_a2dbace8-57e3-4b0a-9596-9864e1c64399" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DividendRateDateDomain_a2dbace8-57e3-4b0a-9596-9864e1c64399_default" xlink:href="wdc-20230630.xsd#wdc_DividendRateDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_wdc_DividendRateDateAxis_a2dbace8-57e3-4b0a-9596-9864e1c64399" xlink:to="loc_wdc_DividendRateDateDomain_a2dbace8-57e3-4b0a-9596-9864e1c64399_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DividendRateDateDomain_9bea4b44-183f-4807-9e21-a7649fa048d7" xlink:href="wdc-20230630.xsd#wdc_DividendRateDateDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_wdc_DividendRateDateAxis_a2dbace8-57e3-4b0a-9596-9864e1c64399" xlink:to="loc_wdc_DividendRateDateDomain_9bea4b44-183f-4807-9e21-a7649fa048d7" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_January312030Member_08a8c09b-1a37-4aa5-bd51-f1a7a2c80a54" xlink:href="wdc-20230630.xsd#wdc_January312030Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_DividendRateDateDomain_9bea4b44-183f-4807-9e21-a7649fa048d7" xlink:to="loc_wdc_January312030Member_08a8c09b-1a37-4aa5-bd51-f1a7a2c80a54" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_January312033Member_d902c63d-af25-417e-823e-020c19c58369" xlink:href="wdc-20230630.xsd#wdc_January312033Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_DividendRateDateDomain_9bea4b44-183f-4807-9e21-a7649fa048d7" xlink:to="loc_wdc_January312033Member_d902c63d-af25-417e-823e-020c19c58369" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockStockRepurchaseProgramDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#ShareholdersEquityandConvertiblePreferredStockStockRepurchaseProgramDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockStockRepurchaseProgramDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EquityClassOfTreasuryStockLineItems_0dd22b92-a164-4878-a2c0-69df42abe717" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EquityClassOfTreasuryStockLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_6907e5a9-43f8-4815-bee4-01c12987c202" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StockRepurchaseProgramAuthorizedAmount1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_0dd22b92-a164-4878-a2c0-69df42abe717" xlink:to="loc_us-gaap_StockRepurchaseProgramAuthorizedAmount1_6907e5a9-43f8-4815-bee4-01c12987c202" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TreasuryStockSharesAcquired_21093e9c-3613-4941-b513-2aa070510181" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TreasuryStockSharesAcquired"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_0dd22b92-a164-4878-a2c0-69df42abe717" xlink:to="loc_us-gaap_TreasuryStockSharesAcquired_21093e9c-3613-4941-b513-2aa070510181" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ClassOfTreasuryStockTable_2a77b29f-af8f-4bc7-959d-f9dd6648b0d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ClassOfTreasuryStockTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_EquityClassOfTreasuryStockLineItems_0dd22b92-a164-4878-a2c0-69df42abe717" xlink:to="loc_us-gaap_ClassOfTreasuryStockTable_2a77b29f-af8f-4bc7-959d-f9dd6648b0d4" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramAxis_28cb9a0c-55f5-4fcb-9d4c-cef2a664943c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareRepurchaseProgramAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ClassOfTreasuryStockTable_2a77b29f-af8f-4bc7-959d-f9dd6648b0d4" xlink:to="loc_us-gaap_ShareRepurchaseProgramAxis_28cb9a0c-55f5-4fcb-9d4c-cef2a664943c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_28cb9a0c-55f5-4fcb-9d4c-cef2a664943c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_28cb9a0c-55f5-4fcb-9d4c-cef2a664943c" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_28cb9a0c-55f5-4fcb-9d4c-cef2a664943c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareRepurchaseProgramDomain_fc205bc3-862c-4830-a02f-343086cfe955" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareRepurchaseProgramDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_ShareRepurchaseProgramAxis_28cb9a0c-55f5-4fcb-9d4c-cef2a664943c" xlink:to="loc_us-gaap_ShareRepurchaseProgramDomain_fc205bc3-862c-4830-a02f-343086cfe955" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_StockRepurchaseProgramEffectiveUntilJuly252023Member_899f50fe-a87a-4094-bdbd-35c3dc8500ba" xlink:href="wdc-20230630.xsd#wdc_StockRepurchaseProgramEffectiveUntilJuly252023Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareRepurchaseProgramDomain_fc205bc3-862c-4830-a02f-343086cfe955" xlink:to="loc_wdc_StockRepurchaseProgramEffectiveUntilJuly252023Member_899f50fe-a87a-4094-bdbd-35c3dc8500ba" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockStockReservedforIssuanceDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#ShareholdersEquityandConvertiblePreferredStockStockReservedforIssuanceDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/ShareholdersEquityandConvertiblePreferredStockStockReservedforIssuanceDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9602cbbd-b03e-4800-900c-e1a98b7dabc9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_e86e1825-c69b-4580-8df1-a626df34fd0b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9602cbbd-b03e-4800-900c-e1a98b7dabc9" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_e86e1825-c69b-4580-8df1-a626df34fd0b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_209e52c1-eede-4e81-ab89-123c3ebde5ea" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems_9602cbbd-b03e-4800-900c-e1a98b7dabc9" xlink:to="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_209e52c1-eede-4e81-ab89-123c3ebde5ea" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AwardTypeAxis_3cc93796-c222-4a0c-a405-9e88bf36de08" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AwardTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfShareBasedCompensationArrangementsByShareBasedPaymentAwardTable_209e52c1-eede-4e81-ab89-123c3ebde5ea" xlink:to="loc_us-gaap_AwardTypeAxis_3cc93796-c222-4a0c-a405-9e88bf36de08" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3cc93796-c222-4a0c-a405-9e88bf36de08_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_AwardTypeAxis_3cc93796-c222-4a0c-a405-9e88bf36de08" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_3cc93796-c222-4a0c-a405-9e88bf36de08_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c7477881-f771-4ba5-afd1-a104f3ad8e54" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_AwardTypeAxis_3cc93796-c222-4a0c-a405-9e88bf36de08" xlink:to="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c7477881-f771-4ba5-afd1-a104f3ad8e54" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_OutstandingAwardsAndSharesAvailableForAwardMember_38cb306c-aa63-4ef7-83d9-90bcf451c1eb" xlink:href="wdc-20230630.xsd#wdc_OutstandingAwardsAndSharesAvailableForAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c7477881-f771-4ba5-afd1-a104f3ad8e54" xlink:to="loc_wdc_OutstandingAwardsAndSharesAvailableForAwardMember_38cb306c-aa63-4ef7-83d9-90bcf451c1eb" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_EmployeeStockPurchasePlanMember_012a2ffd-b7b7-469b-a520-bf99a652023b" xlink:href="wdc-20230630.xsd#wdc_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain_c7477881-f771-4ba5-afd1-a104f3ad8e54" xlink:to="loc_wdc_EmployeeStockPurchasePlanMember_012a2ffd-b7b7-469b-a520-bf99a652023b" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/IncomeTaxExpenseAdditionalInformationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#IncomeTaxExpenseAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/IncomeTaxExpenseAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:href="wdc-20230630.xsd#wdc_IncomeTaxDisclosureLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxHolidayAggregateDollarAmount_3daaef17-6a0b-4d2a-be6f-c842c9a7f7e0" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxHolidayAggregateDollarAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:to="loc_us-gaap_IncomeTaxHolidayAggregateDollarAmount_3daaef17-6a0b-4d2a-be6f-c842c9a7f7e0" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare_8db676ed-1ed6-432e-9196-30a7221238b6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:to="loc_us-gaap_IncomeTaxHolidayIncomeTaxBenefitsPerShare_8db676ed-1ed6-432e-9196-30a7221238b6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsValuationAllowance_68ed9236-ea4e-483a-9dbf-46273c3f4647" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLossCarryforwardsValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:to="loc_us-gaap_OperatingLossCarryforwardsValuationAllowance_68ed9236-ea4e-483a-9dbf-46273c3f4647" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardValuationAllowance_6b114f3b-8295-4f40-9f4c-ddc84aed4322" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxCreditCarryforwardValuationAllowance"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:to="loc_us-gaap_TaxCreditCarryforwardValuationAllowance_6b114f3b-8295-4f40-9f4c-ddc84aed4322" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_e30f70ed-7a40-47cf-9bc3-e7ea9f1d492e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate_e30f70ed-7a40-47cf-9bc3-e7ea9f1d492e" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_6f3c67d5-7dfc-4ef5-89f6-53ebec277e50" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:to="loc_us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued_6f3c67d5-7dfc-4ef5-89f6-53ebec277e50" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_UnrecognizedTaxBenefitsIncludingAccruedInterestAndPenalties_7893ec1d-b9a0-4c2b-8ad4-c9bcfcc01a91" xlink:href="wdc-20230630.xsd#wdc_UnrecognizedTaxBenefitsIncludingAccruedInterestAndPenalties"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:to="loc_wdc_UnrecognizedTaxBenefitsIncludingAccruedInterestAndPenalties_7893ec1d-b9a0-4c2b-8ad4-c9bcfcc01a91" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxesPayableCurrent_1cca7346-8ca7-4f47-bcea-155ab962d5c8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxesPayableCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:to="loc_us-gaap_TaxesPayableCurrent_1cca7346-8ca7-4f47-bcea-155ab962d5c8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_IncomeTaxExaminationEstimateofPossibleLossResultingFromTransferPricingAdjustments_ff14101a-1f1e-4493-a2d6-9536650a9658" xlink:href="wdc-20230630.xsd#wdc_IncomeTaxExaminationEstimateofPossibleLossResultingFromTransferPricingAdjustments"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:to="loc_wdc_IncomeTaxExaminationEstimateofPossibleLossResultingFromTransferPricingAdjustments_ff14101a-1f1e-4493-a2d6-9536650a9658" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_UnrecognizedTaxBenefitsMandatoryDeemedRepatriationLiability_961171f6-b7c6-49d3-baf1-68a8c2bc2547" xlink:href="wdc-20230630.xsd#wdc_UnrecognizedTaxBenefitsMandatoryDeemedRepatriationLiability"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:to="loc_wdc_UnrecognizedTaxBenefitsMandatoryDeemedRepatriationLiability_961171f6-b7c6-49d3-baf1-68a8c2bc2547" xlink:type="arc" order="9"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_IncomeTaxDisclosureTable_f25ed08f-773b-49f8-b698-531e8a6e1964" xlink:href="wdc-20230630.xsd#wdc_IncomeTaxDisclosureTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_wdc_IncomeTaxDisclosureLineItems_85a1bea7-ac01-441d-9bf0-e673a75f5b80" xlink:to="loc_wdc_IncomeTaxDisclosureTable_f25ed08f-773b-49f8-b698-531e8a6e1964" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_3a99c9b9-e13e-4baa-827e-7e74630b361f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_IncomeTaxDisclosureTable_f25ed08f-773b-49f8-b698-531e8a6e1964" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_3a99c9b9-e13e-4baa-827e-7e74630b361f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_3a99c9b9-e13e-4baa-827e-7e74630b361f_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_3a99c9b9-e13e-4baa-827e-7e74630b361f" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_3a99c9b9-e13e-4baa-827e-7e74630b361f_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_62cf921c-e69c-4465-a070-68f2c437619a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_3a99c9b9-e13e-4baa-827e-7e74630b361f" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_62cf921c-e69c-4465-a070-68f2c437619a" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_ec7f77e6-5f82-417c-a5f2-6dc4fa3c5588" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_62cf921c-e69c-4465-a070-68f2c437619a" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_ec7f77e6-5f82-417c-a5f2-6dc4fa3c5588" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_9c3b479d-715b-4609-abec-2507d3714b11" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_62cf921c-e69c-4465-a070-68f2c437619a" xlink:to="loc_us-gaap_DomesticCountryMember_9c3b479d-715b-4609-abec-2507d3714b11" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeAxis_fd961488-d139-440b-84a2-8e78cb74fac3" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_IncomeTaxDisclosureTable_f25ed08f-773b-49f8-b698-531e8a6e1964" xlink:to="loc_srt_RangeAxis_fd961488-d139-440b-84a2-8e78cb74fac3" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_fd961488-d139-440b-84a2-8e78cb74fac3_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_RangeAxis_fd961488-d139-440b-84a2-8e78cb74fac3" xlink:to="loc_srt_RangeMember_fd961488-d139-440b-84a2-8e78cb74fac3_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_RangeMember_d1d81114-9060-4752-9fca-b38695548e87" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_RangeMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_RangeAxis_fd961488-d139-440b-84a2-8e78cb74fac3" xlink:to="loc_srt_RangeMember_d1d81114-9060-4752-9fca-b38695548e87" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MinimumMember_32a47c1a-e018-497d-825f-64f3ad13b361" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MinimumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d1d81114-9060-4752-9fca-b38695548e87" xlink:to="loc_srt_MinimumMember_32a47c1a-e018-497d-825f-64f3ad13b361" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_MaximumMember_3cc61145-8f54-4edf-b896-7924203bb24b" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_MaximumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_RangeMember_d1d81114-9060-4752-9fca-b38695548e87" xlink:to="loc_srt_MaximumMember_3cc61145-8f54-4edf-b896-7924203bb24b" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodAxis_cba48e4f-2336-4be1-b3b6-5ee4caf9e5fa" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxPeriodAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_IncomeTaxDisclosureTable_f25ed08f-773b-49f8-b698-531e8a6e1964" xlink:to="loc_us-gaap_TaxPeriodAxis_cba48e4f-2336-4be1-b3b6-5ee4caf9e5fa" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodDomain_cba48e4f-2336-4be1-b3b6-5ee4caf9e5fa_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_TaxPeriodAxis_cba48e4f-2336-4be1-b3b6-5ee4caf9e5fa" xlink:to="loc_us-gaap_TaxPeriodDomain_cba48e4f-2336-4be1-b3b6-5ee4caf9e5fa_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxPeriodDomain_3e0307d2-fb5b-4fc0-bc3c-391b07bec578" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxPeriodDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_TaxPeriodAxis_cba48e4f-2336-4be1-b3b6-5ee4caf9e5fa" xlink:to="loc_us-gaap_TaxPeriodDomain_3e0307d2-fb5b-4fc0-bc3c-391b07bec578" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TaxYears2013Through2015Member_40df9f72-c8ea-4ea5-bb5b-1fd3f0a928f1" xlink:href="wdc-20230630.xsd#wdc_TaxYears2013Through2015Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_3e0307d2-fb5b-4fc0-bc3c-391b07bec578" xlink:to="loc_wdc_TaxYears2013Through2015Member_40df9f72-c8ea-4ea5-bb5b-1fd3f0a928f1" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TaxYears2008Through2012Member_f3d5b651-3c00-4ea9-9cb8-cddf221ecd6d" xlink:href="wdc-20230630.xsd#wdc_TaxYears2008Through2012Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_3e0307d2-fb5b-4fc0-bc3c-391b07bec578" xlink:to="loc_wdc_TaxYears2008Through2012Member_f3d5b651-3c00-4ea9-9cb8-cddf221ecd6d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TaxYears2008Through2015Member_cd8c5b1d-9c57-4571-8259-8dd482f38c65" xlink:href="wdc-20230630.xsd#wdc_TaxYears2008Through2015Member"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TaxPeriodDomain_3e0307d2-fb5b-4fc0-bc3c-391b07bec578" xlink:to="loc_wdc_TaxYears2008Through2015Member_cd8c5b1d-9c57-4571-8259-8dd482f38c65" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_StatementScenarioAxis_65c8c518-3050-4f4d-a690-69e081fec721" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_StatementScenarioAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_wdc_IncomeTaxDisclosureTable_f25ed08f-773b-49f8-b698-531e8a6e1964" xlink:to="loc_srt_StatementScenarioAxis_65c8c518-3050-4f4d-a690-69e081fec721" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_65c8c518-3050-4f4d-a690-69e081fec721_default" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_srt_StatementScenarioAxis_65c8c518-3050-4f4d-a690-69e081fec721" xlink:to="loc_srt_ScenarioUnspecifiedDomain_65c8c518-3050-4f4d-a690-69e081fec721_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioUnspecifiedDomain_cdb9bbfb-1ab5-4494-980c-0f208583df5e" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioUnspecifiedDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_srt_StatementScenarioAxis_65c8c518-3050-4f4d-a690-69e081fec721" xlink:to="loc_srt_ScenarioUnspecifiedDomain_cdb9bbfb-1ab5-4494-980c-0f208583df5e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_srt_ScenarioForecastMember_c8c04ca6-5d20-441f-9046-749d90156191" xlink:href="https://xbrl.fasb.org/srt/2023/elts/srt-2023.xsd#srt_ScenarioForecastMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_srt_ScenarioUnspecifiedDomain_cdb9bbfb-1ab5-4494-980c-0f208583df5e" xlink:to="loc_srt_ScenarioForecastMember_c8c04ca6-5d20-441f-9046-749d90156191" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/IncomeTaxExpenseNOLCarryforwardDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#IncomeTaxExpenseNOLCarryforwardDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/IncomeTaxExpenseNOLCarryforwardDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsLineItems_e4dab4a7-1540-409e-be53-c96f19c39b23" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLossCarryforwardsLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwards_ab7239bf-eeba-4315-adfb-141552875f41" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLossCarryforwards"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_e4dab4a7-1540-409e-be53-c96f19c39b23" xlink:to="loc_us-gaap_OperatingLossCarryforwards_ab7239bf-eeba-4315-adfb-141552875f41" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxCreditCarryforwardAmount_d7a0d1a4-9eee-454d-9ccd-44a77adc33d4" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxCreditCarryforwardAmount"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_e4dab4a7-1540-409e-be53-c96f19c39b23" xlink:to="loc_us-gaap_TaxCreditCarryforwardAmount_d7a0d1a4-9eee-454d-9ccd-44a77adc33d4" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OperatingLossCarryforwardsTable_3702c910-9045-45e4-bea4-897ded819866" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OperatingLossCarryforwardsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_OperatingLossCarryforwardsLineItems_e4dab4a7-1540-409e-be53-c96f19c39b23" xlink:to="loc_us-gaap_OperatingLossCarryforwardsTable_3702c910-9045-45e4-bea4-897ded819866" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityAxis_5292916a-d2ee-411a-8c9a-64f73108cf7d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_3702c910-9045-45e4-bea4-897ded819866" xlink:to="loc_us-gaap_IncomeTaxAuthorityAxis_5292916a-d2ee-411a-8c9a-64f73108cf7d" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_5292916a-d2ee-411a-8c9a-64f73108cf7d_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_5292916a-d2ee-411a-8c9a-64f73108cf7d" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_5292916a-d2ee-411a-8c9a-64f73108cf7d_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityDomain_31729ddc-5087-45ae-9657-c48726d55af6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityAxis_5292916a-d2ee-411a-8c9a-64f73108cf7d" xlink:to="loc_us-gaap_IncomeTaxAuthorityDomain_31729ddc-5087-45ae-9657-c48726d55af6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_DomesticTaxAuthorityPre2017ActGenerationMember_c45b71b0-9410-4e2a-b664-c48a5c295d45" xlink:href="wdc-20230630.xsd#wdc_DomesticTaxAuthorityPre2017ActGenerationMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_31729ddc-5087-45ae-9657-c48726d55af6" xlink:to="loc_wdc_DomesticTaxAuthorityPre2017ActGenerationMember_c45b71b0-9410-4e2a-b664-c48a5c295d45" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAndLocalJurisdictionMember_a0705909-9ce0-42bc-b86f-8501e9458b13" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StateAndLocalJurisdictionMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_31729ddc-5087-45ae-9657-c48726d55af6" xlink:to="loc_us-gaap_StateAndLocalJurisdictionMember_a0705909-9ce0-42bc-b86f-8501e9458b13" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DomesticCountryMember_00190c63-649a-40aa-bb67-5220fa538ff7" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DomesticCountryMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityDomain_31729ddc-5087-45ae-9657-c48726d55af6" xlink:to="loc_us-gaap_DomesticCountryMember_00190c63-649a-40aa-bb67-5220fa538ff7" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameAxis_15dbc3d3-e335-4d42-982f-04d427c4fb7a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityNameAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_OperatingLossCarryforwardsTable_3702c910-9045-45e4-bea4-897ded819866" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameAxis_15dbc3d3-e335-4d42-982f-04d427c4fb7a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_15dbc3d3-e335-4d42-982f-04d427c4fb7a_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_15dbc3d3-e335-4d42-982f-04d427c4fb7a" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_15dbc3d3-e335-4d42-982f-04d427c4fb7a_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_IncomeTaxAuthorityNameDomain_0c269970-e461-4548-87aa-92e4637a466f" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_IncomeTaxAuthorityNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameAxis_15dbc3d3-e335-4d42-982f-04d427c4fb7a" xlink:to="loc_us-gaap_IncomeTaxAuthorityNameDomain_0c269970-e461-4548-87aa-92e4637a466f" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_TaxAuthorityMalaysiaMember_b1e725c4-33d6-41fd-885e-1b3b22e5d9b7" xlink:href="wdc-20230630.xsd#wdc_TaxAuthorityMalaysiaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_0c269970-e461-4548-87aa-92e4637a466f" xlink:to="loc_wdc_TaxAuthorityMalaysiaMember_b1e725c4-33d6-41fd-885e-1b3b22e5d9b7" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AdministrationOfTheTreasuryBelgiumMember_31867767-64e6-445f-9d0d-bd94156bcba6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AdministrationOfTheTreasuryBelgiumMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_0c269970-e461-4548-87aa-92e4637a466f" xlink:to="loc_us-gaap_AdministrationOfTheTreasuryBelgiumMember_31867767-64e6-445f-9d0d-bd94156bcba6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_NationalTaxAgencyJapanMember_d5929022-d9ce-4796-9c1a-e3a00e8cb656" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_NationalTaxAgencyJapanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_0c269970-e461-4548-87aa-92e4637a466f" xlink:to="loc_us-gaap_NationalTaxAgencyJapanMember_d5929022-d9ce-4796-9c1a-e3a00e8cb656" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_StateAdministrationOfTaxationChinaMember_f363015d-9b93-4077-9196-0e85f77974b2" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_StateAdministrationOfTaxationChinaMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_0c269970-e461-4548-87aa-92e4637a466f" xlink:to="loc_us-gaap_StateAdministrationOfTaxationChinaMember_f363015d-9b93-4077-9196-0e85f77974b2" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TaxAuthoritySpainMember_55ce6c0e-2276-4a25-be70-3bb51306df3e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TaxAuthoritySpainMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_IncomeTaxAuthorityNameDomain_0c269970-e461-4548-87aa-92e4637a466f" xlink:to="loc_us-gaap_TaxAuthoritySpainMember_55ce6c0e-2276-4a25-be70-3bb51306df3e" xlink:type="arc" order="4"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/NetIncomeLossPerCommonShareAdditionalInformationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#NetIncomeLossPerCommonShareAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/NetIncomeLossPerCommonShareAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_d8031bb3-7ac0-4b46-937d-daffa3377a4b" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_455eeb25-e5bd-4d2b-a7fa-bd138ced1697" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentInterestRateStatedPercentage"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_d8031bb3-7ac0-4b46-937d-daffa3377a4b" xlink:to="loc_us-gaap_DebtInstrumentInterestRateStatedPercentage_455eeb25-e5bd-4d2b-a7fa-bd138ced1697" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_baf407d1-b479-4664-a178-18d67ac48865" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareLineItems_d8031bb3-7ac0-4b46-937d-daffa3377a4b" xlink:to="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_baf407d1-b479-4664-a178-18d67ac48865" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentAxis_3d5e3c38-2ce0-4bce-b2bc-26f374f3b988" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_baf407d1-b479-4664-a178-18d67ac48865" xlink:to="loc_us-gaap_DebtInstrumentAxis_3d5e3c38-2ce0-4bce-b2bc-26f374f3b988" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_3d5e3c38-2ce0-4bce-b2bc-26f374f3b988_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_DebtInstrumentAxis_3d5e3c38-2ce0-4bce-b2bc-26f374f3b988" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_3d5e3c38-2ce0-4bce-b2bc-26f374f3b988_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_DebtInstrumentNameDomain_a37d21b4-1bd9-4a35-b648-8ee00e6d905e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_DebtInstrumentNameDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_DebtInstrumentAxis_3d5e3c38-2ce0-4bce-b2bc-26f374f3b988" xlink:to="loc_us-gaap_DebtInstrumentNameDomain_a37d21b4-1bd9-4a35-b648-8ee00e6d905e" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember_68feee36-8b2d-4232-b655-1ddb65ce7e4b" xlink:href="wdc-20230630.xsd#wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_DebtInstrumentNameDomain_a37d21b4-1bd9-4a35-b648-8ee00e6d905e" xlink:to="loc_wdc_OnePointFiftyPercentSeniorConvertibleNotesDueTwoThousandTwentyFourMember_68feee36-8b2d-4232-b655-1ddb65ce7e4b" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeAxis_f5cdbbab-f81d-42ef-87a3-2df6b23c51d1" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfAntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareTable_baf407d1-b479-4664-a178-18d67ac48865" xlink:to="loc_us-gaap_LongtermDebtTypeAxis_f5cdbbab-f81d-42ef-87a3-2df6b23c51d1" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_f5cdbbab-f81d-42ef-87a3-2df6b23c51d1_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f5cdbbab-f81d-42ef-87a3-2df6b23c51d1" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_f5cdbbab-f81d-42ef-87a3-2df6b23c51d1_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LongtermDebtTypeDomain_984eb7ae-a6c3-4f76-8103-de2c47753316" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LongtermDebtTypeDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_LongtermDebtTypeAxis_f5cdbbab-f81d-42ef-87a3-2df6b23c51d1" xlink:to="loc_us-gaap_LongtermDebtTypeDomain_984eb7ae-a6c3-4f76-8103-de2c47753316" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ConvertibleDebtMember_4debca3f-770d-4095-ae77-1de531826570" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ConvertibleDebtMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LongtermDebtTypeDomain_984eb7ae-a6c3-4f76-8103-de2c47753316" xlink:to="loc_us-gaap_ConvertibleDebtMember_4debca3f-770d-4095-ae77-1de531826570" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/EmployeeTerminationAssetImpairmentandOtherChargesAdditionalInformationDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#EmployeeTerminationAssetImpairmentandOtherChargesAdditionalInformationDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/EmployeeTerminationAssetImpairmentandOtherChargesAdditionalInformationDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_98b11545-2dc7-465d-94a9-55395ebbb996" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnDispositionOfAssets1_d6527c07-f6d2-437e-a113-0992682f9e70" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnDispositionOfAssets1"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_98b11545-2dc7-465d-94a9-55395ebbb996" xlink:to="loc_us-gaap_GainLossOnDispositionOfAssets1_d6527c07-f6d2-437e-a113-0992682f9e70" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6e2986f8-6ec5-4a97-b5a6-ed023cfa06c9" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_98b11545-2dc7-465d-94a9-55395ebbb996" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6e2986f8-6ec5-4a97-b5a6-ed023cfa06c9" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_314260b5-4465-4438-a612-fe052effe52c" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_6e2986f8-6ec5-4a97-b5a6-ed023cfa06c9" xlink:to="loc_us-gaap_RestructuringPlanAxis_314260b5-4465-4438-a612-fe052effe52c" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_314260b5-4465-4438-a612-fe052effe52c_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_314260b5-4465-4438-a612-fe052effe52c" xlink:to="loc_us-gaap_RestructuringPlanDomain_314260b5-4465-4438-a612-fe052effe52c_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_08544252-b10f-40b6-a4e2-bdbbad29b869" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_314260b5-4465-4438-a612-fe052effe52c" xlink:to="loc_us-gaap_RestructuringPlanDomain_08544252-b10f-40b6-a4e2-bdbbad29b869" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_BusinessRealignmentActivitiesMember_3af70a1a-1f56-4d6b-955f-8b63690051d0" xlink:href="wdc-20230630.xsd#wdc_BusinessRealignmentActivitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_08544252-b10f-40b6-a4e2-bdbbad29b869" xlink:to="loc_wdc_BusinessRealignmentActivitiesMember_3af70a1a-1f56-4d6b-955f-8b63690051d0" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/EmployeeTerminationAssetImpairmentandOtherChargesExpenseRecognitionDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#EmployeeTerminationAssetImpairmentandOtherChargesExpenseRecognitionDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/EmployeeTerminationAssetImpairmentandOtherChargesExpenseRecognitionDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_77291dce-963b-4ea7-8acd-4ade885dc370" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_60b163c0-7f64-4f8c-b920-31a062502941" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_77291dce-963b-4ea7-8acd-4ade885dc370" xlink:to="loc_us-gaap_RestructuringCharges_60b163c0-7f64-4f8c-b920-31a062502941" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_4492c85d-536d-45f4-ab0a-efeddeb082a5" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_77291dce-963b-4ea7-8acd-4ade885dc370" xlink:to="loc_us-gaap_GainLossOnSalesOfAssetsAndAssetImpairmentCharges_4492c85d-536d-45f4-ab0a-efeddeb082a5" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_5439ea7f-dcd9-4b3d-a1fe-1966ef9e7004" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostsAndAssetImpairmentCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_77291dce-963b-4ea7-8acd-4ade885dc370" xlink:to="loc_us-gaap_RestructuringCostsAndAssetImpairmentCharges_5439ea7f-dcd9-4b3d-a1fe-1966ef9e7004" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_b329a1f7-4fca-4776-9a32-29a1d87441ab" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_77291dce-963b-4ea7-8acd-4ade885dc370" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_b329a1f7-4fca-4776-9a32-29a1d87441ab" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_8c8370c1-3a8e-4388-8315-2f9d7f341f69" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_b329a1f7-4fca-4776-9a32-29a1d87441ab" xlink:to="loc_us-gaap_RestructuringPlanAxis_8c8370c1-3a8e-4388-8315-2f9d7f341f69" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_8c8370c1-3a8e-4388-8315-2f9d7f341f69_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_8c8370c1-3a8e-4388-8315-2f9d7f341f69" xlink:to="loc_us-gaap_RestructuringPlanDomain_8c8370c1-3a8e-4388-8315-2f9d7f341f69_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_2b0c6d9d-7761-44b5-bdc9-9e32d481a679" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_8c8370c1-3a8e-4388-8315-2f9d7f341f69" xlink:to="loc_us-gaap_RestructuringPlanDomain_2b0c6d9d-7761-44b5-bdc9-9e32d481a679" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_BusinessRealignmentActivitiesMember_cee571ff-21c8-40cd-b26b-875edb5ccaf6" xlink:href="wdc-20230630.xsd#wdc_BusinessRealignmentActivitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_2b0c6d9d-7761-44b5-bdc9-9e32d481a679" xlink:to="loc_wdc_BusinessRealignmentActivitiesMember_cee571ff-21c8-40cd-b26b-875edb5ccaf6" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://www.wdc.com/role/EmployeeTerminationAssetImpairmentandOtherChargesBusinessRealignmentActivitiesDetails" xlink:type="simple" xlink:href="wdc-20230630.xsd#EmployeeTerminationAssetImpairmentandOtherChargesBusinessRealignmentActivitiesDetails"/>
  <link:definitionLink xlink:role="http://www.wdc.com/role/EmployeeTerminationAssetImpairmentandOtherChargesBusinessRealignmentActivitiesDetails" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveLineItems_2f62c45e-ddfc-4523-b9c7-b9a83d8a816a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveLineItems"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserveRollForward_5ee74210-a6b0-4fff-9ca3-0594996f320e" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringReserveRollForward"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_2f62c45e-ddfc-4523-b9c7-b9a83d8a816a" xlink:to="loc_us-gaap_RestructuringReserveRollForward_5ee74210-a6b0-4fff-9ca3-0594996f320e" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_efdcf200-a427-411e-a626-00abd24c0053" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringReserve"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_5ee74210-a6b0-4fff-9ca3-0594996f320e" xlink:to="loc_us-gaap_RestructuringReserve_efdcf200-a427-411e-a626-00abd24c0053" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCharges_276bac26-65a4-4bce-8e69-b1fbdff1e49a" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCharges"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_5ee74210-a6b0-4fff-9ca3-0594996f320e" xlink:to="loc_us-gaap_RestructuringCharges_276bac26-65a4-4bce-8e69-b1fbdff1e49a" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_PaymentsForRestructuring_cd2779a3-475c-42ad-b80b-a6b9a3fa1e37" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_PaymentsForRestructuring"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringReserveRollForward_5ee74210-a6b0-4fff-9ca3-0594996f320e" xlink:to="loc_us-gaap_PaymentsForRestructuring_cd2779a3-475c-42ad-b80b-a6b9a3fa1e37" xlink:type="arc" order="3"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringReserve_99db462b-7428-4802-96d8-40b5a04eb0e8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringReserve"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_613c8ab2-a4d5-41b9-b06d-349f8e624812" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ScheduleOfRestructuringAndRelatedCostsTable"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/all" xlink:from="loc_us-gaap_RestructuringCostAndReserveLineItems_2f62c45e-ddfc-4523-b9c7-b9a83d8a816a" xlink:to="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_613c8ab2-a4d5-41b9-b06d-349f8e624812" xlink:type="arc" order="1" xbrldt:closed="true" xbrldt:contextElement="segment"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringCostAndReserveAxis_8674e8d6-713e-419a-81a0-a4db5c64ccf8" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringCostAndReserveAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_613c8ab2-a4d5-41b9-b06d-349f8e624812" xlink:to="loc_us-gaap_RestructuringCostAndReserveAxis_8674e8d6-713e-419a-81a0-a4db5c64ccf8" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_8674e8d6-713e-419a-81a0-a4db5c64ccf8_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_8674e8d6-713e-419a-81a0-a4db5c64ccf8" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_8674e8d6-713e-419a-81a0-a4db5c64ccf8_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_TypeOfRestructuringDomain_3a7153fe-c998-450f-9847-051286c54cb6" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_TypeOfRestructuringDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringCostAndReserveAxis_8674e8d6-713e-419a-81a0-a4db5c64ccf8" xlink:to="loc_us-gaap_TypeOfRestructuringDomain_3a7153fe-c998-450f-9847-051286c54cb6" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OneTimeTerminationBenefitsMember_bf13fc44-d457-400e-9e87-af5a14f8aa1d" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OneTimeTerminationBenefitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_TypeOfRestructuringDomain_3a7153fe-c998-450f-9847-051286c54cb6" xlink:to="loc_us-gaap_OneTimeTerminationBenefitsMember_bf13fc44-d457-400e-9e87-af5a14f8aa1d" xlink:type="arc" order="0"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanAxis_34910d58-0da5-4fb0-9bfd-50e1b0ecd125" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanAxis"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/hypercube-dimension" xlink:from="loc_us-gaap_ScheduleOfRestructuringAndRelatedCostsTable_613c8ab2-a4d5-41b9-b06d-349f8e624812" xlink:to="loc_us-gaap_RestructuringPlanAxis_34910d58-0da5-4fb0-9bfd-50e1b0ecd125" xlink:type="arc" order="2"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_34910d58-0da5-4fb0-9bfd-50e1b0ecd125_default" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-default" xlink:from="loc_us-gaap_RestructuringPlanAxis_34910d58-0da5-4fb0-9bfd-50e1b0ecd125" xlink:to="loc_us-gaap_RestructuringPlanDomain_34910d58-0da5-4fb0-9bfd-50e1b0ecd125_default" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestructuringPlanDomain_aa1fa48f-131d-4153-99b2-99ae483ca971" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestructuringPlanDomain"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/dimension-domain" xlink:from="loc_us-gaap_RestructuringPlanAxis_34910d58-0da5-4fb0-9bfd-50e1b0ecd125" xlink:to="loc_us-gaap_RestructuringPlanDomain_aa1fa48f-131d-4153-99b2-99ae483ca971" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_BusinessRealignmentActivitiesMember_1388f4b8-6ea2-4442-aa4d-462939d52c28" xlink:href="wdc-20230630.xsd#wdc_BusinessRealignmentActivitiesMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_RestructuringPlanDomain_aa1fa48f-131d-4153-99b2-99ae483ca971" xlink:to="loc_wdc_BusinessRealignmentActivitiesMember_1388f4b8-6ea2-4442-aa4d-462939d52c28" xlink:type="arc" order="0"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="simple" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-roles-2023.xsd#eedm"/>
  <link:definitionLink xlink:role="http://fasb.org/us-gaap/role/eedm/ExtensibleEnumerationLists" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_LiabilitiesCurrentAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AccruedLiabilitiesCurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_LiabilitiesCurrentAbstract" xlink:to="loc_us-gaap_AccruedLiabilitiesCurrent" xlink:type="arc" order="1"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_AssetsAbstract" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_AssetsAbstract"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_OtherAssetsNoncurrent" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_OtherAssetsNoncurrent"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_AssetsAbstract" xlink:to="loc_us-gaap_OtherAssetsNoncurrent" xlink:type="arc" order="1"/>
  </link:definitionLink>
  <link:roleRef roleURI="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="simple" xlink:href="https://xbrl.sec.gov/ecd/2023/ecd-2023.xsd#AwardTypeOnly"/>
  <link:definitionLink xlink:role="http://xbrl.sec.gov/ecd/AwardTypeOnly" xlink:type="extended">
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_RestrictedStockUnitsRSUMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_RestrictedStockUnitsRSUMember" xlink:type="arc" order="4"/>
    <link:loc xlink:type="locator" xlink:label="loc_us-gaap_EmployeeStockMember" xlink:href="https://xbrl.fasb.org/us-gaap/2023/elts/us-gaap-2023.xsd#us-gaap_EmployeeStockMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_us-gaap_EmployeeStockMember" xlink:type="arc" order="5"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_RestrictedStockUnitsAndPerformanceStockUnitsMember_79121abf-cf85-4c0b-8098-c9d910be5f5a" xlink:href="wdc-20230630.xsd#wdc_RestrictedStockUnitsAndPerformanceStockUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_wdc_RestrictedStockUnitsAndPerformanceStockUnitsMember_79121abf-cf85-4c0b-8098-c9d910be5f5a" xlink:type="arc" order="6"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_EmployeeStockPurchasePlanMember_60107f37-8f08-4f35-9752-223dc98f06f8" xlink:href="wdc-20230630.xsd#wdc_EmployeeStockPurchasePlanMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_wdc_EmployeeStockPurchasePlanMember_60107f37-8f08-4f35-9752-223dc98f06f8" xlink:type="arc" order="7"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_RestrictedStockUnitsAndPerformanceShareUnitsMember_b50b1926-edbb-432c-97de-a280b6cf6deb" xlink:href="wdc-20230630.xsd#wdc_RestrictedStockUnitsAndPerformanceShareUnitsMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_wdc_RestrictedStockUnitsAndPerformanceShareUnitsMember_b50b1926-edbb-432c-97de-a280b6cf6deb" xlink:type="arc" order="8"/>
    <link:loc xlink:type="locator" xlink:label="loc_wdc_OutstandingAwardsAndSharesAvailableForAwardMember_7c87a1a5-b02e-4f3e-bb8c-3a0aab1ed222" xlink:href="wdc-20230630.xsd#wdc_OutstandingAwardsAndSharesAvailableForAwardMember"/>
    <link:definitionArc xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="loc_us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardAwardTypeAndPlanNameDomain" xlink:to="loc_wdc_OutstandingAwardsAndSharesAvailableForAwardMember_7c87a1a5-b02e-4f3e-bb8c-3a0aab1ed222" xlink:type="arc" order="9"/>
  </link:definitionLink>
</link:linkbase>
