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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
1499694	D James Morris	C/O Western Digital Corporation 3355 Michelson Drive, Suite 100 Irvine CA 92612	Evp & Gm, Storage Products	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	2012-03-20	7,841	$19.40	66,061	No	4	M	Direct
Common Stock	Acquisiton	2012-03-20	7,194	$23.46	73,255	No	4	M	Direct
Common Stock	Acquisiton	2012-03-20	7,438	$28.09	80,693	No	4	M	Direct
Common Stock	Acquisiton	2012-03-20	16,317	$23.78	97,010	No	4	M	Direct
Common Stock	Acquisiton	2012-03-20	30,147	$16.85	127,157	No	4	M	Direct
Common Stock	Disposition	2012-03-20	76,349	$39.00	50,808	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	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	Employee Stock Option (right to buy)	Disposition	2012-03-20	30,147	$0.00	30,147	$16.85
Common Stock	Employee Stock Option (right to buy)	Disposition	2012-03-20	7,841	$0.00	7,841	$19.40
Common Stock	Employee Stock Option (right to buy)	Disposition	2012-03-20	7,194	$0.00	7,194	$23.46
Common Stock	Employee Stock Option (right to buy)	Disposition	2012-03-20	16,317	$0.00	16,317	$23.78
Common Stock	Employee Stock Option (right to buy)	Disposition	2012-03-20	7,438	$0.00	7,438	$28.09

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
16,716	2010-02-04	2016-02-04	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
3,626	2009-09-11	2015-09-11	No	4	M	Direct
0	2009-02-06	2015-02-06	No	4	M	Direct

Footnotes

Includes 258 shares acquired under the issuer's Employee Stock Purchase Plan on November 30, 2011.
The option vested 25% one year from the grant date of 2/4/2009, and an additional 6.25% vested at the end of each three-month period through 2/4/2012. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 2/4/2013.
The option vested 25% on the first anniversary of the grant date and 6.25% at the end of each three-month period thereafter.
The option vested 25% one year from the grant date of 9/11/2008, and an additional 6.25% vested at the end of each three-month period through 3/11/2012. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 9/11/2012.