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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
1593123	P Mark Long	C/O Western Digital Corporation 3355 Michelson Drive, Suite 100 Irvine CA 92612	Evp, Chief Strategy Officer	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	2015-09-11	55	$0.00	28,136	No	4	M	Direct
Common Stock	Disposition	2015-09-11	1,475	$80.53	26,661	No	4	F	Direct
Common Stock	Disposition	2015-09-14	1,354	$81.10	25,307	No	4	S	Direct
Common Stock	Acquisiton	2015-09-15	876	$48.63	26,183	No	4	M	Direct
Common Stock	Disposition	2015-09-15	876	$80.96	25,307	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	F	Direct
No	4	S	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	2015-09-11	56	$0.00	56	$0.00
Common Stock	Employee Stock Option (right to buy)	Disposition	2015-09-15	876	$0.00	876	$48.63

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
736			No	4	M	Direct
16,652	2014-02-13	2020-02-13	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 $68.68 was also paid to the holder to settle a fractional dividend equivalent of 0.8528.
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 December 18, 2014.
The option vested 25% one year from the grant date of 2/13/2013, and an additional 6.25% vested at the end of each three-month period through 8/13/2015. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 2/13/2017.