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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
106040	Western Digital Corp	WDC	Computer Storage Devices (3572)	330956711

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1499701	U. Wolfgang Nickl	C/O Western Digital Corporation 3355 Michelson Drive, Suite 100 Irvine CA 92612	Evp & Cfo	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership
Common Stock	Acquisiton	2013-09-08	196	$0.00	63,618	No	4	M	Direct
Common Stock	Disposition	2013-09-08	4,839	$64.99	58,779	No	4	F	Direct
Common Stock	Acquisiton	2013-09-10	7,429	$28.09	66,208	No	4	M	Direct
Common Stock	Acquisiton	2013-09-10	3,015	$24.18	69,223	No	4	M	Direct
Common Stock	Acquisiton	2013-09-10	2,130	$19.40	71,353	No	4	M	Direct
Common Stock	Acquisiton	2013-09-10	5,920	$23.46	77,273	No	4	M	Direct
Common Stock	Disposition	2013-09-10	20,043	$65.65	57,230	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	F	Direct
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Dividend Equivalent Rights	Disposition	2013-09-08	197	$0.00	197	$0.00
Common Stock	Employee Stock Option (right to buy)	Disposition	2013-09-10	2,130	$0.00	2,130	$19.40
Common Stock	Employee Stock Option (right to buy)	Disposition	2013-09-10	5,920	$0.00	5,920	$23.46
Common Stock	Employee Stock Option (right to buy)	Disposition	2013-09-10	3,015	$0.00	3,015	$24.18
Common Stock	Employee Stock Option (right to buy)	Disposition	2013-09-10	7,429	$0.00	7,429	$28.09

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
1,207			No	4	M	Direct
0	2007-11-08	2016-11-08	No	4	M	Direct
0	2008-09-12	2014-09-12	No	4	M	Direct
0	2007-02-17	2016-02-17	No	4	M	Direct
0	2009-02-06	2015-02-06	No	4	M	Direct

Footnotes

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 restricted stock units to which the dividend equivalents relate. A cash amount equal to $38.44 was also paid to the holder to settle a fractional dividend equivalent of 0.5915.
Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).
These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on May 17, 2013.
Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $65.23 to a high of $65.88. 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.
The option vested 25% on the first anniversary of the grant date and 6.25% at the end of each three-month period thereafter.