Exhibit 24

POWER OF ATTORNEY

The undersigned, as a Section 16
reporting person of Komag Incorporated (the "Company"), hereby constitutes
and appoints Jan Schwartz and Kathleen A. Bayless, and each of them, the
undersigned's true and lawful attorney-in-fact to:

1.	complete and
execute Forms 3, 4 and 5 and other forms and all amendments thereto as such
attorney-in-fact shall in his or her discretion determine to be required or
advisable pursuant to Section 16 of the Securities Exchange Act of 1934 (as
amended) and the rules and regulations promulgated thereunder, or any
successor laws and regulations, as a consequence of the undersigned's
ownership, acquisition or disposition of securities of the Company; and


2. do all acts necessary in order to file such forms with the Securities
and Exchange Commission, any securities exchange or national association,
the Company and such other person or agency as the attorney-in-fact shall
deem appropriate.

The undersigned hereby ratifies and confirms all
that said attorneys-in-fact and agents shall do or cause to be done by
virtue hereof.  The undersigned acknowledges that the foregoing
attorneys-in-fact, in serving in such capacity at the request of the
undersigned, are not assuming, nor is the Company assuming, any of the
undersigned's responsibilities to comply with Section 16 of the Securities
Exchange Act of 1934 (as amended).

This Power of Attorney shall remain
in full force and effect until the undersigned is no longer required to
file Forms 3, 4, and 5 with respect to the undersigned's holdings of and
transactions in securities issued by the Company, unless earlier revoked by
the undersigned in a signed writing delivered to the Company and the
foregoing attorneys-in-fact.

	IN WITNESS WHEREOF, the undersigned has
caused this Power of Attorney to be executed as of this 25th day of
October, 2005.


Signature: 	/s/ Paul G. Judy

Print Name: 	Paul
G. Judy