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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
1499789	K James Welsh	C/O Western Digital Corporation 3355 Michelson Drive, Suite 100 Irvine CA 92612	Evp & Gm, Branded 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	Disposition	2011-02-06	1,306	$36.21	48,014	No	4	F	Direct
Common Stock	Acquisiton	2011-02-07	2,631	$23.46	50,645	No	4	M	Direct
Common Stock	Acquisiton	2011-02-07	4,266	$23.78	54,911	No	4	M	Direct
Common Stock	Acquisiton	2011-02-07	4,500	$16.85	59,411	No	4	M	Direct
Common Stock	Disposition	2011-02-07	13,653	$36.44	45,758	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	F	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	2011-02-07	4,500	$0.00	4,500	$16.85
Common Stock	Employee Stock Option (right to buy)	Disposition	2011-02-07	2,631	$0.00	2,631	$23.46
Common Stock	Employee Stock Option (right to buy)	Disposition	2011-02-07	4,266	$0.00	4,266	$23.78

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
36,003	2010-02-04	2016-02-04	No	4	M	Direct
5,077	2008-09-12	2014-09-12	No	4	M	Direct
14,931	2009-09-11	2015-09-11	No	4	M	Direct

Footnotes

Payment of tax obligation by withholding securities incident to the vesting of securities in accordance with Rule 16b-3(e).
Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $36.31 to a high of $36.4601. 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% 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 2/4/2011. 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% one year from the grant date of 9/12/2007, and an additional 6.25% vested at the end of each three-month period through 12/12/2010. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 9/12/2011.
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 12/11/2010. 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.