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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
1201490	D Michael Cordano	C/O Western Digital Corporation 5601 Great Oaks Parkway San Jose CA 95119	President And Coo	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	2017-04-07	7,007	$68.53	62,878	No	4	M	Direct
Common Stock	Acquisiton	2017-04-07	15,170	$68.49	78,048	No	4	M	Direct
Common Stock	Disposition	2017-04-07	22,177	$85.00	55,871	No	4	S	Direct
Common Stock	Acquisiton	2017-04-10	4,960	$68.49	60,831	No	4	M	Direct
Common Stock	Disposition	2017-04-10	4,960	$85.40	55,871	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	M	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	Employee Stock Option (right to buy)	Disposition	2017-04-07	15,170	$0.00	15,170	$68.49
Common Stock	Employee Stock Option (right to buy)	Disposition	2017-04-10	4,960	$0.00	4,960	$68.49
Common Stock	Employee Stock Option (right to buy)	Disposition	2017-04-07	7,007	$0.00	7,007	$68.53

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
25,285	2014-08-14	2020-08-14	No	4	M	Direct
20,325	2014-08-14	2020-08-14	No	4	M	Direct
15,414	2016-11-03	2022-11-03	No	4	M	Direct

Footnotes

These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 8, 2016.
The option vested 25% one year from the grant date of 8/14/2013, and an additional 6.25% vested at the end of each three-month period through 2/14/2017. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 8/14/2017.
The option vested 25% one year from the grant date of 11/3/2015, and an additional 6.25% vested at the end of each three-month period through 2/3/2017. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 11/3/2019.