WESTERN DIGITAL CORP — Director's Dealing 2007

Nov 8, 2007

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: WESTERN DIGITAL CORP (WDC)
CIK: 0000106040
Period of Report: 2007-11-05

Reporting Person: MASSENGILL MATTHEW E (Director)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2007-11-07	Common Stock	S	2000	$28.06	Disposed	188330	Direct
2007-11-07	Common Stock	S	1900	$28.05	Disposed	186430	Direct
2007-11-07	Common Stock	S	6900	$28.04	Disposed	179530	Direct
2007-11-07	Common Stock	S	6300	$28.03	Disposed	173230	Direct
2007-11-07	Common Stock	S	5900	$28.02	Disposed	167330	Direct
2007-11-07	Common Stock	S	3500	$28.01	Disposed	163830	Direct
2007-11-07	Common Stock	S	13300	$28	Disposed	150530	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2007-11-05	Employee Stock Option (right to buy)	$10.21	M	181500	Disposed	2015-01-20	Common Stock (181500)	Direct
2007-11-07	Employee Stock Option (right to buy)	$11.6875	M	19400	Disposed	2008-07-01	Common Stock (19400)	Direct
2007-11-07	Employee Stock Option (right to buy)	$11.6875	M	19900	Disposed	2008-08-11	Common Stock (19900)	Direct
2007-11-05	Employee Stock Option (right to buy)	$13.07	M	103500	Disposed	2013-09-24	Common Stock (103500)	Direct
2007-11-06	Employee Stock Option (right to buy)	$13.07	M	164100	Disposed	2013-09-24	Common Stock (164100)	Direct
2007-11-07	Employee Stock Option (right to buy)	$13.07	M	6150	Disposed	2013-09-24	Common Stock (6150)	Direct
2007-11-07	Employee Stock Option (right to buy)	$18.625	M	29550	Disposed	2008-02-23	Common Stock (29550)	Direct
2007-11-06	Non-Qualified Stock Option (right to buy)	$27.64	A	7364	Acquired	2014-11-06	Common Stock (7364)	Direct

Holdings (Non-Derivative)

Security	Shares	Ownership
Common Stock	4008	Indirect

Footnotes

F1: The option was scheduled to vest 25% on the first anniversary of the grant date and an additional 6.25% at the end of each three-month period thereafter. By agreement between WDC and the reporting person, each installment of the option scheduled to vest after July 31, 2007 has been cancelled.

F2: The option vested 100% on the first anniversary of the grant date.

F3: The option vested 25% one year from the grant date and 75% two years from the grant date.

F4: The option vested 25% on the first anniversary of the grant date and 6.25% at the end of each three-month period thereafter.

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