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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
1232826	E Matthew Massengill	C/O Western Digital Corporation 3355 Michelson Drive, Suite 100 Irvine CA 92612		Yes	No	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	2013-03-18	4,364	$27.64	19,457	No	4	M	Direct
Common Stock	Acquisiton	2013-03-18	8,743	$15.34	28,200	No	4	M	Direct
Common Stock	Acquisiton	2013-03-18	3,607	$25.79	31,807	No	4	M	Direct
Common Stock	Acquisiton	2013-03-18	9,185	$19.09	40,992	No	4	M	Direct
Common Stock	Disposition	2013-03-18	25,899	$49.91	15,093	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	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2013-03-18	8,743	$0.00	8,743	$15.34
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2013-03-18	9,185	$0.00	9,185	$19.09
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2013-03-18	3,607	$0.00	3,607	$25.79
Common Stock	Non-Qualified Stock Option (right to buy)	Disposition	2013-03-18	4,364	$0.00	4,364	$27.64

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
8,000	2009-11-06	2015-11-06	No	4	M	Direct
0	2008-02-06	2017-02-06	No	4	M	Direct
7,935	2012-11-10	2018-11-10	No	4	M	Direct
3,000	2008-11-06	2014-11-06	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	4,007	Indirect	by IRA

Footnotes

Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $49.7601 to a high of $50.02. 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.
The option vested 25% one year from the grant date of 11/10/2011, and an additional 6.25% vested at the end of the three-month period on 2/10/2013. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 11/10/2015.