WESTERN DIGITAL CORP — Director's Dealing 2017

May 3, 2017

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTERN DIGITAL CORP (WDC)
CIK: 0000106040
Period of Report: 2017-05-01

Reporting Person: LONG MARK P (Pres WD Capital, CSO & CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-05-01	Common Stock	M	15774	$48.63	Acquired	114522	Direct
2017-05-01	Common Stock	M	11632	$68.49	Acquired	126154	Direct
2017-05-01	Common Stock	S	43000	$86.7684	Disposed	83154	Direct
2017-05-01	Common Stock	S	14446	$87.7368	Disposed	68708	Direct
2017-05-01	Common Stock	S	400	$88.28	Disposed	68308	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-05-01	Employee Stock Option (right to buy)	$48.63	M	15774	Disposed	2020-02-13	Common Stock (15774)	Direct
2017-05-01	Employee Stock Option (right to buy)	$68.49	M	11632	Disposed	2020-08-14	Common Stock (11632)	Direct

Footnotes

F1: These transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on March 16, 2017.

F2: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $86.22 to a high of $87.20. 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.

F3: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $87.25 to a high of $88.18. 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.

F4: Represents the weighted average sale price per share. These shares were sold in multiple transactions at prices ranging from a low of $88.25 to a high of $88.31. 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.

F5: The option vested 25% on the first anniversary of the grant date and 6.25% at the end of each three-month period thereafter.

F6: 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.