KOMAG INC /DE/
SC 13G, 2000-01-19
MAGNETIC & OPTICAL RECORDING MEDIA
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	FIRST PACIFIC ADVISORS, INC.
	11400 WEST OLYMPIC BOULEVARD - SUITE 1200 - LOS ANGELES, CALIFORNIA 90064
	WRITER'S DIRECT DIAL NUMBER
	(310) 996-5458



                                                  January 7, 2000


VIA EDGAR


Filer Support
U.S. Securities and Exchange Commission
Operations Center, Stop 0-7
6432 General Green Way
Alexandria, VA 22312

Re:  Schedule 13G
     Relating to the Ownership of Komag, Incorporated.


Gentlemen:

Enclosed herewith pursuant to Rule 13d-1(b) of the Securities Exchange Act of
1934 is one (1) copy of Schedule 13G for the period ended December 31, 1999
which has been filed through the EDGAR system.  No filing fee is required.

If you have any questions regarding this filing, please contact the undersigned.

                                                  Sincerely,

                                                   /s/ J. Richard Atwood

                                                  J. Richard Atwood
                                                  Senior Vice President


JRA:vb

Enclosures















	UNITED STATES
	SECURITIES AND EXCHANGE COMMISSION
	Washington, D.C. 20549



	SCHEDULE 13G


	Under the Securities Exchange Act of 1934

	(Amendment No.     3     )*


	Komag, Incorporated
	(Name of Issuer)

	Common Stock
	(Title of Class of Securities)

	500453105
	(CUSIP Number)



Check the following box if a fee is being paid with this statement [ ].  (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).

*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 1 OF 4 PAGES

CUSIP No.  500453105

1)  NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

               First Pacific Advisors, Inc.
               04-3118452

2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                        (A)  [ ]
               N/A                                      (B)  [ ]

3)  SEC USE ONLY



4)  CITIZENSHIP OR PLACE OF ORGANIZATION

               Massachusetts

                   (5)  SOLE VOTING POWER
                                                                 -0-
  NUMBER OF
   SHARES          (6)  SHARED VOTING POWER
BENEFICIALLY                                                     -0-
OWNED BY EACH
  REPORTING        (7)  SOLE DISPOSITIVE POWER
 PERSON WITH                                                     -0-

                   (8)  SHARED DISPOSITIVE POWER
                                                                 -0-

9)  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

               -0-

10) CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*

               N/A

11) PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

               0.0

12) TYPE OF REPORTING PERSON*

               IA







*SEE INSTRUCTION BEFORE FILLING OUT!



	PAGE 2 OF 4 PAGES

ITEM 1(a)    NAME OF ISSUER.

               Komag, Incorporated

ITEM 1(b)    ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

               1704 Automation Parkway, San Jose, CA  95131

ITEM 2(a)    NAME OF PERSON FILING.

               First Pacific Advisors, Inc.

ITEM 2(b)    ADDRESS OF PRINCIPAL BUSINESS OFFICE, OR, IF NONE, RESIDENCE.

               11400 West Olympic Boulevard, Suite 1200, Los Angeles, CA 90064

ITEM 2(c)    CITIZENSHIP OR PLACE OF ORGANIZATION.

               Massachusetts

ITEM 2(d)    TITLE OF CLASS OF SECURITIES.

               Common Stock

ITEM 2(e)    CUSIP NUMBER.

               500453105

ITEM 3       REPORTING PERSON.

               See Item 12 on cover page

ITEM 4       OWNERSHIP.

               See Items 5 - 11 on cover page

ITEM 5       OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

               First Pacific Advisors, Inc. had no beneficial ownership of the
               Common Stock of Komag, Incorporated as of December 31, 1999.

ITEM 6       OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

               N/A

ITEM 7      IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
            THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY.

               N/A










	PAGE 3 OF 4 PAGES

ITEM 8       IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.

               N/A

ITEM 9       NOTICE OF DISSOLUTION OF GROUP.

               N/A

ITEM 10      CERTIFICATION.



     By signing below I certify that, to the best of my knowledge
and belief, the securities referred to above were acquired in the
ordinary course of business and were not acquired for the purpose
of and do not have the effect of changing or influencing the
control of the issuer of such securities and were not acquired in
connection with or as a participant in any transaction having such
purpose or effect.

     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.


	January 7, 2000

Date


	/s/ J. Richard Atwood

Signature



	J. Richard Atwood, Senior Vice President

Name/Title



















	PAGE 4 OF 4 PAGES







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