SEC Form 4
FORM 4 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number: 3235-0287
Estimated average burden
hours per response: 0.5
  
 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
1. Name and Address of Reporting Person*
CARRILLO JOSEPH R
(Last) (First) (Middle)
C/O WESTERN DIGITAL CORPORATION
20511 LAKE FOREST DRIVE
(Street)
LAKE FOREST CA 92630-7741
(City) (State) (Zip)
2. Issuer Name and Ticker or Trading Symbol
WESTERN DIGITAL CORP [ WDC ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
X Officer (give title below) Other (specify below)
Principal Accounting Officer
3. Date of Earliest Transaction (Month/Day/Year)
09/12/2007
4. If Amendment, Date of Original Filed (Month/Day/Year)
 6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V Amount (A) or (D) Price
Common Stock 09/12/2007 M 2,450 A $18.625 65,898(1) D
Common Stock 09/12/2007 M 5,000 A $17.8125 70,898 D
Common Stock 09/12/2007 M 1,000 A $12.875 71,898 D
Common Stock 09/12/2007 M 30,000 A $5.4375 101,898 D
Common Stock 09/12/2007 M 39,266 A $2.1 141,164 D
Common Stock 09/12/2007 M 10,000 A $6 151,164 D
Common Stock 09/12/2007 M 10,000 A $2.8125 161,164 D
Common Stock 09/12/2007 M 2,284 A $12.25 163,448 D
Common Stock 09/12/2007 S 7,500 D $23.38 155,948 D
Common Stock 09/12/2007 S 12,000 D $23.4 143,948 D
Common Stock 09/12/2007 S 5,000 D $23.42 138,948 D
Common Stock 09/12/2007 S 2,000 D $23.39 136,948 D
Common Stock 09/12/2007 S 3,000 D $23.37 133,948 D
Common Stock 09/12/2007 S 5,000 D $23.3 128,948 D
Common Stock 09/12/2007 S 30,000 D $23.35 98,948 D
Common Stock 09/12/2007 S 3,000 D $23.31 95,948 D
Common Stock 09/12/2007 S 5,000 D $23.32 90,948 D
Common Stock 09/12/2007 S 5,000 D $23.34 85,948 D
Common Stock 09/12/2007 S 5,000 D $23.36 80,948 D
Common Stock 09/12/2007 S 3,500 D $23.52 77,448 D
Common Stock 09/12/2007 S 1,500 D $23.54 75,948 D
Common Stock 09/12/2007 S 2,000 D $23.48 73,948 D
Common Stock 09/12/2007 S 3,500 D $23.46 70,448 D
Common Stock 09/12/2007 S 5,000 D $23.45 65,448 D
Common Stock 09/12/2007 S 2,000 D $23.43 63,448 D
Common Stock(2) 09/12/2007 A 2,768 A $0 66,216 D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year) 3A. Deemed Execution Date, if any (Month/Day/Year) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year) 7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares
Employee Stock Option (right to buy) $2.1 09/12/2007 M 39,266 09/26/2002(3) 09/26/2011 Common Stock 39,266 $0 734 D
Employee Stock Option (right to buy) $2.8125 09/12/2007 M 10,000 05/05/2000(4) 11/05/2009 Common Stock 10,000 $0 0 D
Employee Stock Option (right to buy) $5.4375 09/12/2007 M 30,000 09/03/2000(3) 08/27/2009 Common Stock 30,000 $0 0 D
Employee Stock Option (right to buy) $6 09/12/2007 M 10,000 10/27/2001(3) 10/27/2010 Common Stock 10,000 $0 0 D
Employee Stock Option (right to buy) $12.25 09/12/2007 M 2,284 08/06/2005(5) 08/06/2008 Common Stock 2,284 $0 0 D
Employee Stock Option (right to buy) $12.875 09/12/2007 M 1,000 11/17/1999(3) 11/17/2008 Common Stock 1,000 $0 0 D
Employee Stock Option (right to buy) $17.8125 09/12/2007 M 5,000 03/27/1999(3) 03/27/2008 Common Stock 5,000 $0 0 D
Employee Stock Option (right to buy) $18.625 09/12/2007 M 2,450 02/23/1999(3) 02/23/2008 Common Stock 2,450 $0 0 D
Employee Stock Option (right to buy) $23.46 09/12/2007 A 6,988 09/12/2008(6) 09/12/2014 Common Stock 6,988 $0 6,988 D
Explanation of Responses:
1. Includes 1,671 shares acquired under the Issuer's Employee Stock Purchase Plan on May 31, 2007.
2. Represents the grant of restricted stock units to the reporting person. Each restricted stock unit represents a contingent right to receive one share of the Issuer's common stock.
3. The option vested 25% on the first anniversary of the grant date and 6.25% at the end of each three-month period thereafter.
4. The option vested 25% 6 months from the grant date, 25% 12 months from the grant date, 25% 18 months from the grant date, and 25% 24 months from the grant date.
5. The option vested 100% seven years from the grant date.
6. The option vests 25% on the first anniversary of the grant date and 6.25% at the end of each three-month period thereafter.
Remarks:
Exhibit List: Exhibit 24 - Power-of-Attorney
By: /s/ Van Huynh Attorney-in-Fact For: Joseph R. Carrillo 09/14/2007
** Signature of Reporting Person Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.