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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 5601 Great Oaks Parkway San Jose CA 95119	Pres Wd Capital, Cso & Cfo	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	2018-08-02	129	$0.00	191,154	No	4	M	Direct
Common Stock	Disposition	2018-08-02	2,749	$68.52	188,405	No	4	F	Direct
Common Stock	Acquisiton	2018-08-03	2,233	$44.78	190,638	No	4	M	Direct
Common Stock	Disposition	2018-08-03	2,233	$68.74	188,405	No	4	S	Direct
Common Stock	Acquisiton	2018-08-03	203	$0.00	188,608	No	4	M	Direct
Common Stock	Disposition	2018-08-03	2,026	$67.96	186,582	No	4	F	Direct
Common Stock	Disposition	2018-08-06	1,214	$67.65	185,368	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership
No	4	M	Direct
No	4	F	Direct
No	4	M	Direct
No	4	S	Direct
No	4	M	Direct
No	4	F	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	2018-08-02	129	$0.00	129	$0.00
Common Stock	Dividend Equivalent Rights	Disposition	2018-08-03	204	$0.00	204	$0.00
Common Stock	Employee Stock Option (right to buy)	Disposition	2018-08-03	2,233	$0.00	2,233	$44.78

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
9,488			No	4	M	Direct
9,284			No	4	M	Direct
40,199	2017-08-03	2023-08-03	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 was also paid to the holder to settle a fractional dividend equivalent.
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 April 30, 2018.
The option vested 25% one year from the grant date of 8/3/2016, and an additional 6.25% vested at the end of each three-month period through 8/3/2018. The remaining shares subject to the option will vest at 6.25% at the end of each three-month period until fully vested on 8/3/2020.