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: 2017-04-28

Reporting Person: RAY MICHAEL CHARLES (EVP, Chief Legal Officer & Sec)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2017-04-28	Common Stock	M	9557	$68.49	Acquired	50963	Direct
2017-04-28	Common Stock	M	6041	$68.53	Acquired	57004	Direct
2017-04-28	Common Stock	S	15598	$90.51	Disposed	41406	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2017-04-28	Employee Stock Option (right to buy)	$68.49	M	9557	Disposed	2020-08-14	Common Stock (9557)	Direct
2017-04-28	Employee Stock Option (right to buy)	$68.53	M	6041	Disposed	2022-11-03	Common Stock (6041)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	8.403	Indirect

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 June 8, 2016.

F2: Includes 1 share acquired under the Issuer's Employee Stock Purchase Plan on November 30, 2016.

F3: 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.

F4: 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.