<PAGE> 1
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
(RULE 13d-102)
INFORMATION TO BE INCLUDED IN STATEMENTS FILED PURSUANT
TO RULES 13d-1(b) (c), AND (d)
PURSUANT TO RULE 13d-2(b)
(Amendment No.____)
KOMAG, INCORPORATED
- --------------------------------------------------------------------------------
(Name of Issuer)
Common Stock, Par Value $.01 Per Share
- --------------------------------------------------------------------------------
(Title of Class of Securities)
500453-10-5
- --------------------------------------------------------------------------------
(CUSIP Number)
April 8, 1999
- --------------------------------------------------------------------------------
(Date of Event Which Requires Filing of this Statement
Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
[ ] Rule 13d-1(b)
[X] Rule 13d-1(c)
[ ] Rule 13d-1(d)
- -----------
*The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class of
securities, and for any subsequent amendment containing information which would
alter the disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).
<PAGE> 2
- ------------------------------ -------------------------
CUSIP NO. 500453-10-5 13G PAGE 2 OF 5 PAGES
- ------------------------------ -------------------------
(1) NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS (ENTITIES ONLY)
Western Digital Corporation (95-2647125)
---------------------------------------------------------------------
(2) CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP* (a) [ ]
(b) [ ]
---------------------------------------------------------------------
(3) SEC USE ONLY
---------------------------------------------------------------------
(4) CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
---------------------------------------------------------------------
(5) SOLE VOTING POWER
NUMBER OF 10,783,132
SHARES --------------------------------------------------------
BENEFICIALLY (6) SHARED VOTING POWER
OWNED BY 0
EACH --------------------------------------------------------
REPORTING (7) SOLE DISPOSITIVE POWER
PERSON WITH 10,783,132
--------------------------------------------------------
(8) SHARED DISPOSITIVE POWER
0
--------------------------------------------------------
(9) AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
10,783,132
---------------------------------------------------------------------
(10) CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 9 EXCLUDES CERTAIN
SHARES* [ ]
---------------------------------------------------------------------
(11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
16.7%
---------------------------------------------------------------------
(12) TYPE OF REPORTING PERSON*
CO
---------------------------------------------------------------------
*SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE> 3
ITEM 1(a). NAME OF ISSUER:
Komag, Incorporated
ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:
1704 Automation Parkway, San Jose, California 95131
ITEM 2(a) NAME OF PERSON FILING:
Western Digital Corporation
ITEM 2(b) ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:
8105 Irvine Center Drive, Irvine, California 92618
ITEM 2(c) CITIZENSHIP:
Delaware
ITEM 2(d) TITLE OF CLASS OF SECURITIES:
Common Stock, Par Value $.01 Per Share
ITEM 2(e) CUSIP NUMBER:
500453-10-5
ITEM 3. This statement is filed pursuant to rule 13d-1(c)
ITEM 4. OWNERSHIP
(a) Amount Beneficially Owned: 10,783,132
(b) Percent of Class: 16.7%
(c) Number of shares as to which such person has:
(i) sole power to vote or to direct the vote: 10,783,132
(ii) shared power to vote or to direct the vote: 0
(iii) sole power to dispose or to direct the disposition of: 10,783,132
(iv) shared power to dispose or to direct the disposition of: 0
<PAGE> 4
ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS
Not Applicable
ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.
Not Applicable
ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY
Not Applicable
ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
Not Applicable
ITEM 9. NOTICE OF DISSOLUTION OF GROUP
Not Applicable
ITEM 10. CERTIFICATION
By signing below I certify that, to the best of my knowledge and
belief, the securities referred to above were not acquired and are not
held for the purpose of or with the effect of changing or influencing
the control of the issuer of the securities and were not acquired and
are not held in connection with or as a participant in any transaction
having that purpose or effect.
<PAGE> 5
SIGNATURE
After reasonable inquiry and to the best of my knowledge and belief, I
certify that the information set forth in this statement is true, complete and
correct.
DATED: April 16, 1999
By: /s/ MICHAEL A. CORNELIUS
------------------------------------
Michael A. Cornelius
Vice President, Law & Administration
