1 AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON APRIL 6, 2001 REGISTRATION NO. 333-56738 ================================================================================ UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 ------------------------- POST-EFFECTIVE AMENDMENT NO. 6 TO FORM S-8 POST-EFFECTIVE AMENDMENT NO. 2 TO FORM S-8 REGISTRATION STATEMENT NO. 33-9853 REGISTRATION STATEMENT NO. 33-24585 ------------------------- ------------------------- POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 POST-EFFECTIVE AMENDMENT NO. 1 TO FORM S-8 REGISTRATION STATEMENT NO. 33-33365 REGISTRATION STATEMENT NO. 333-56738 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ------------------------- WESTERN DIGITAL CORPORATION (Exact name of Registrant as specified in its charter) DELAWARE 33-0956711 (State or other jurisdiction of (I.R.S. Employer incorporation or organization) Identification No.) 20511 LAKE FOREST DRIVE LAKE FOREST, CALIFORNIA 92630 (949) 672-7000 (Address, including zip code, and telephone number, including area code, of Registrant's principal executive offices) ------------------------- WESTERN DIGITAL CORPORATION AMENDED AND RESTATED STOCK OPTION PLAN FOR NON-EMPLOYEE DIRECTORS (Full Title of Plan) ------------------------- MICHAEL A. CORNELIUS VICE PRESIDENT, LAW & ADMINISTRATION AND SECRETARY WESTERN DIGITAL CORPORATION 20511 LAKE FOREST DRIVE LAKE FOREST, CALIFORNIA 92630 (949) 672-7000 (Name, address, including zip code, and telephone number, including area code, of agent for service) ================================================================================

2 POST-EFFECTIVE AMENDMENT Western Digital Corporation, a Delaware corporation (the "Registrant"), files this Post-Effective Amendment to the Registration Statements on Form S-8, as the successor issuer to Western Digital Technologies, Inc. (formerly, Western Digital Corporation), a Delaware corporation ("Western Digital"), in accordance with Rule 414 under the Securities Act of 1933, as amended (the "Securities Act"). This Post-Effective Amendment is filed to reflect the adoption by Western Digital of a holding company organizational structure in accordance with Section 251(g) of the Delaware General Corporation Law (the "DGCL"). The holding company organizational structure was effected pursuant to an Agreement and Plan of Merger to Form Holding Company (the "Merger Agreement") among Western Digital, the Registrant, and WD Merger Sub, Inc., a Delaware corporation and a wholly-owned subsidiary of the Registrant ("Merger Sub"). The Merger Agreement provided for the merger of Merger Sub into Western Digital, with Western Digital continuing as the surviving corporation and as a wholly-owned subsidiary of the Registrant (the "Merger"). Prior to the Merger the Registrant was a wholly-owned subsidiary of Western Digital. Pursuant to Section 251(g) of the DGCL, stockholder approval of the Merger was not required. As a result of the Merger, the consolidated assets and liabilities of the Registrant immediately after the Merger were the same as the consolidated assets and liabilities of Western Digital immediately prior to the Merger. As a result of the Merger, which was consummated on April 6, 2001, each share of Western Digital common stock, par value $.01 per share ("Western Digital Common Stock") issued and outstanding or held in treasury was converted into one share of the Registrant's common stock, par value $0.1 per share ("Registrant Common Stock"). Also, as a result of the Merger, each outstanding option to purchase Western Digital Common Stock under the Western Digital Amended and Restated Stock Option Plan for Non-Employee Directors (the "Plan") was converted into an option to purchase the same number of shares of Registrant Common Stock on the same terms and conditions. The Registrant also adopted and assumed as its own all of the rights and obligations of Western Digital under the Plan. In connection with the formation of the holding company, effective upon consummation of the Merger, (i) the Board of Directors of Western Digital terminated the Rights Agreement between Western Digital and American Stock Transfer & Trust Company, as rights agent, dated October 15, 1998, as amended, and all outstanding rights thereunder to purchase a fraction of a share of the Series A Junior Participating Preferred Stock of Western Digital expired, (ii) the Registrant entered into a new Rights Agreement between the Registrant and American Stock Transfer & Trust Company, as rights agent, dated April 6, 2001, and (iii) the Registrant declared a dividend of one right to purchase a fraction of a share of the Series A Junior Participating Preferred Stock of the Registrant for each share of the Registrant Common Stock which was distributed to holders of Registrant Common Stock at the close of business on April 6, 2001. Until otherwise provided by the new Rights Agreement, the Registrant's rights will be evidenced by certificates of Registrant Common Stock. Issuable under the Plan are 2,600,000 shares of common stock. A total of: (i) 400,000 shares of common stock issuable under the Plan were registered under the Registration Statement on Form S-8, Registration No. 33-9853, as filed with the Securities and Exchange Commission on October 30, 1986 (which includes 200,000 shares of common stock registered on the Form S-8 Registration Statement and 200,000 shares of common stock registered pursuant to Rule 416 in connection with Western Digital's stock dividend of one share for each share outstanding on May 20, 1997); (ii) 600,000 shares of common stock issuable under the Plan were registered under Post-Effective Amendment No. 3 to Registration Statement No. 33-9853 on Form S-8 (Registration No. 33-24585), as filed with the Securities and Exchange Commission on September 28, 1988 (which includes 300,000 shares of common stock registered on Post-Effective Amendment No. 3 to the Form S-8 Registration Statement and 300,000 shares of common stock registered pursuant to Rule 416 in connection with Western Digital's stock dividend of one share for each share outstanding on May 20, 1997); (iii) 600,000 shares of common stock issuable under the Plan were registered under Post-Effective Amendment No. 4 to Registration Statement No. 33-9853 on Form S-8 (Registration No. 33-33365) as filed with the Securities and Exchange Commission on February 6, 1990 (which includes 300,000 shares of common stock registered on Post-Effective Amendment No. 4 to the Form S-8 Registration Statement and 300,000 shares of common stock registered pursuant to Rule 416 in connection with Western Digital's stock dividend of one share for each share outstanding on May 20, 1997); and (iv) 1,000,000 shares of common stock issuable under the Plan were registered under Post-Effective Amendment No. 5 to Registration Statement No. 33-9853 on Form S-8 (Registration No. 333-56738) as filed with the Securities and Exchange Commission on March 8, 2001.

3 In accordance with Rule 414, the Registrant, as the successor issuer to Western Digital, hereby expressly adopts Registration Statements No. 33-9853, 33-24585, 33-33365 and 333-56738 on Form S-8 as its own for all purposes of the Securities Act and the Securities Exchange Act of 1934, as amended. Registration fees were paid at the time of filing the original Registration Statements and subsequent amendments thereto.

4 SIGNATURES Pursuant to the requirements of the Securities Act of 1933, as amended, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-8 and has duly caused this Post-Effective Amendment to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Lake Forest, State of California, on March 29, 2001. WESTERN DIGITAL CORPORATION By: /s/ MATTHEW E. MASSENGILL ------------------------------------- Matthew E. Massengill President and Chief Executive Officer Pursuant to the requirements of the Securities Act of 1933, as amended, this Post-Effective Amendment to the Form S-8 Registration Statements has been signed below by the following persons in the capacities indicated on March 29, 2001. SIGNATURE TITLE --------- ----- /s/ MATTHEW E. MASSENGILL President and Chief Executive Officer - ------------------------------------------ (Principal Executive Officer) and Director Matthew E. Massengill /s/ TERESA A. HOPP Senior Vice President, and Chief Financial Officer - ------------------------------------------ (Principal Financial and Accounting Officer) Teresa A. Hopp /s/ THOMAS E. PARDUN Chairman of the Board - ------------------------------------------ Thomas E. Pardun /s/ PETER D. BEHRENDT Director - ------------------------------------------ Peter D. Behrendt /s/ I. M. BOOTH Director - ------------------------------------------ I. M. Booth /s/ KATHLEEN A. COTE Director - ------------------------------------------ Kathleen A. Cote /s/ HENRY T. DeNERO Director - ------------------------------------------ Henry T. DeNero /s/ ROGER H. MOORE Director - ------------------------------------------ Roger H. Moore