X0202 4 2004-09-08 0 0000106040 WESTERN DIGITAL CORP WDC 0001232826 MASSENGILL MATTHEW E C/O WESTERN DIGITAL CORP 20511 LAKE FOREST DRIVE LAKE FOREST CA 92630 1 1 0 0 Chairman and CEO Common Stock 2004-09-08 4 M 0 20800 7.5625 A 467068 D Common Stock 4007.537 I By Trust 401(K) Employee Stock Option (right to buy) 7.5625 2004-09-08 4 M 0 20800 0 D 2004-09-08 Common Stock 20800 0 D This transaction is a purchase of stock pursuant to the exercise of stock options that would have soon expired and were originally granted in September 1994 under the Issuer's Amended and Restated Employee Stock Option Plan in a transaction exempt under Rule 16b-3. On September 8, 1995, 25% of the total shares granted became exercisable and 6.25% became exercisable each quarter thereafter. /s/Sandra Garcia Attorney-in-Fact for Matthew E. Massengill 2004-09-09