SEC Form 4 
FORM 4	UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940 	  
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	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).			
1. Name and Address of Reporting Person*
RAY MICHAEL CHARLES	

(Last)	(First)	(Middle)	
C/O WESTERN DIGITAL CORPORATION	
5601 GREAT OAKS PARKWAY	

(Street) 
SAN JOSE	CA	95119	

(City)	(State)	(Zip)	
	2. Issuer Name and Ticker or Trading Symbol 
WESTERN DIGITAL CORP [ WDC ] 	5. Relationship of Reporting Person(s) to Issuer 
(Check all applicable) 
	Director		10% Owner	
X	Officer (give title below)		Other (specify below)	
EVP, Chief Legal Officer & Sec	
		
	3. Date of Earliest Transaction (Month/Day/Year)
09/04/2019 		
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) 
X	Form filed by One Reporting Person	
	Form filed by More than One Reporting Person	
	
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned	
1. Title of Security (Instr. 3) 	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8) 	4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 	5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 	7. Nature of Indirect Beneficial Ownership (Instr. 4) 	
			Code	V	Amount	(A) or (D)	Price				
Common Stock	09/04/2019		M(1) 		17,548	A	$44.78 	112,480	D		
Common Stock	09/04/2019		S(1) 		87,053	D	$59.9557(2) 	25,427	D		
Common Stock	09/04/2019		A		9,278(3) 	A	$0.0 	34,705	D		
Common Stock	09/04/2019		M		617(4) 	A	$0.0 	35,322	D		
Common Stock	09/04/2019		F		4,905(5) 	D	$59.33 	30,417	D		
Common Stock(6) 	09/04/2019		A		26,335	A	$0.0 	56,752	D		
Common Stock	09/05/2019		S(1) 		4,990	D	$60.51 	51,762	D		
Common Stock								9.0103	I	by Trust 401(K)	
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities) 	
1. Title of Derivative Security (Instr. 3) 	2. Conversion or Exercise Price of Derivative Security 	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8) 	5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 	6. Date Exercisable and Expiration Date (Month/Day/Year)	7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 	8. Price of Derivative Security (Instr. 5) 	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 	11. Nature of Indirect Beneficial Ownership (Instr. 4) 	
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares					
Dividend Equivalent Rights	(4)	09/04/2019		M			617.5268	(4) 	(4) 	Common Stock	617.5268	$0.0 	2,287.0059(7) 	D		
Employee Stock Option (right to buy)	$44.78 	09/04/2019		M(1) 			17,548	08/03/2017(8) 	08/03/2023	Common Stock	17,548	$0.0 	17,547	D		
Explanation of Responses:	
1. These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 1, 2019.	
2. Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $59.78 to a high of $60. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price.	
3. Represents shares issued as payment in respect of the vesting of a performance-based restricted stock unit award.	
4. The dividend equivalents were converted into, and paid in the form of, shares of the Issuer's common stock on a one-for-one basis in connection with the vesting of performance-based restricted stock units to which the dividend equivalents relate. A cash amount was also paid to the holder to settle a fractional dividend equivalent.	
5. Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).	
6. Represents the grant of restricted stock units to the Reporting Person. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.	
7. The total number of derivative securities has been adjusted to reflect the cancellation of 164.1992 stock units previously credited in the form of dividend equivalent payments on stock units that did not vest.	
8. The option vested 25% one year from the grant date of 8/3/2016, and an additional 6.25% vested at the end of each three-month period through 8/3/2019. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 8/3/2020.	
	By: /s/ Sandra Garcia Attorney-in-Fact For: Michael C. Ray	09/06/2019	
	** Signature of Reporting Person	Date	
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.	
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).	
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).	
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.	
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