Document:

Exhibit 4.1

                           PSEG Energy Holdings L.L.C.

Description of Membership Interest

The material terms of PSEG Energy Holdings' L.L.C. membership interest are set
forth below. The Limited Liability Company Agreement dated as of October 2, 2002
(the "LLC Agreement") should be reviewed in its entirety for a complete
discussion of the membership interest.

CAPITAL CONTRIBUTIONS: The Initial Member was deemed admitted as of the date of
the formation of the Company and was obligated to make the capital contribution
provided for in the LLC Agreement. The Initial Member is Public Service
Enterprise Group Incorporated.

ADDITIONAL CAPITAL CONTRIBUTIONS: The Initial Member is not required to make
additional capital contributions. The Initial Member, upon its written consent,
may make additional capital contributions.

VOTING RIGHTS: All voting rights are conferred on the Initial Member.

ALLOCATION OF PROFITS AND LOSSES: Profits and losses are allocated to the
Initial Member.

DISTRIBUTIONS: Distributions to the Initial Member shall be made at the time and
in aggregate amounts determined by the Board of Managers.

ADMISSION OF ADDITIONAL MEMBERS: One or more additional members may be admitted
upon the written consent of the Initial Member.

AMENDMENT: Amendments to the LLC Agreement may be made exclusively by the Board
of Managers.

ADDITIONAL CLASSES OF SECURITIES: The Board of Managers has the ability to
establish additional classes of securities.

OTHER PROVISIONS: There are no provisions with respect to conversion, sinking
fund requirements, redemption, classification of the board of managers,
pre-emption rights, restrictions on alienability, or discrimination against any
holder of a substantial amount of securities.<PAGE>
                                                                     Exhibit 4.2

                                 AMENDMENT NO. 1
                        TO REGISTRATION RIGHTS AGREEMENT

         This AMENDMENT NO. 1 (this "Amendment"), dated as of October 1, 2002,
to the Registration Rights Agreement dated June 30, 2002 (the "Agreement") by
and among Komag, Incorporated (the "Company"), JDS Capital, L.P., Dimensional
Partners, L.P., Dimensional Partners, Ltd., Rutland Partners, L.P. and Cerberus
Partners, L.P. (together with their respective successors and permitted assigns,
the "Holders"), is entered into by and among the Company, the Holders and
Citadel Equity Fund Ltd. ("Citadel"). Capitalized terms not otherwise defined
herein have the meanings set forth in Section 1 of the Agreement.

         WHEREAS, in order to induce the Holders to support the Company's Plan
of Reorganization (the "Plan"), the Company entered into the Agreement to
provide registration rights with respect to the shares of Common Stock and the
Senior Secured Notes Due 2007 of the Company issued to the Holders pursuant to
the Plan who were not eligible to take advantage of the resale exemption
provided by Section 1145(b) of the United States Bankruptcy Reform Act of 1978,
as amended (the "Bankruptcy Code");

         WHEREAS, Citadel is also ineligible to take advantage of the resale
exemption provided by Section 1145(b) of the Bankruptcy Code;

         WHEREAS, pursuant to Section 9(d) of the Agreement, the Agreement may
be amended with the written consent of the Company, the Majority Common Stock
Holders and the Majority Note Holders affected by any such amendment;

         WHEREAS, the Holders, who represent the Majority Common Stock Holders
and the Majority Note Holders affected by the proposed amendment, and the
Company desire to amend the Agreement to include Citadel as a party to the
Agreement, subject to the same terms and conditions as the Holders;

         WHEREAS, in addition to admitting Citadel to the Agreement, the
Company, the Holders and Citadel also desire to make certain modifications to
the terms of the Agreement as set forth in this Amendment.

         NOW, THEREFORE, in consideration of the mutual covenants and agreements
set forth in this Amendment, and for other good and valuable consideration, the
receipt and sufficiency of which are hereby acknowledged, the parties hereto
agree as follows:

         1. Subject to the terms and conditions of this Amendment, as of the
date hereof, Citadel shall become a party to the Agreement and shall be entitled
to the rights and benefits of a "Holder" of Registrable Securities for all
purposes of the Agreement, and shall assume the duties and obligations of a
Holder of Registrable Securities for all purposes of the Agreement. Without
limiting the generality of the foregoing, Citadel acknowledges the
indemnification obligations, market stand-off agreement and duty to furnish
information under the Agreement, as well as the applicability of (i) the various
terms, conditions and restrictions
<PAGE>
arising in connection with the inclusion of Registrable Securities in any
registration in accordance with the Agreement and (ii) the priorities and
exceptions on inclusion in registration that the Holders, including, without
limitation, Citadel, are subject to thereunder.

         2. The definition of "Registrable Securities" under Section 1 is hereby
amended in its entirety to read as follows, with the added text highlighted in
italics:

         "Registrable Common Stock Securities: The shares of Common Stock
         originally issued to the Holders pursuant to the Plan, the shares of
         Common Stock issuable upon exercise of warrants to purchase Common
         Stock originally issued to the Holders pursuant to the Plan, and any
         securities which may be issued or distributed with respect to, or in
         exchange for, such Registrable Common Stock Securities pursuant to a
         stock dividend, stock split or other distribution, merger,
         consolidation, recapitalization or reclassification or similar
         transaction; provided, however, that any such Registrable Common Stock
         Securities shall cease to be Registrable Common Stock Securities to the
         extent (i) a Registration Statement with respect to the sale of such
         Registrable Common Stock Securities has been declared effective under
         the Securities Act and such Registrable Common Stock Securities have
         been disposed of in accordance with the plan of distribution set forth
         in such Registration Statement, (ii) subject to Section 3(d) hereof,
         such Registrable Common Stock Securities are transferred pursuant to
         Rule 144 (or any similar provision then in force) under the Securities
         Act or (iii) such Registrable Common Stock Securities shall have been
         otherwise transferred pursuant to an exemption from the securities
         laws, if subsequent transfers of such securities will not require
         registration or qualification of such securities under the Securities
         Act or any state securities laws then in force and all restrictive
         legends shall have been removed from the certificates representing such
         Registrable Common Stock Securities; provided, further, however, that
         any securities that have ceased to be Registrable Common Stock
         Securities cannot thereafter become Registrable Common Stock
         Securities, and any securities that are issued or distributed in
         respect of securities that have ceased to be Registrable Common Stock
         Securities are not Registrable Common Stock Securities."

         3. The text of the first paragraph of Section 6(b) is hereby amended in
its entirety to read as follows, with the added text highlighted in italics:

         "Indemnification by Holder of Registrable Securities. Each Holder of
         Registrable Securities agrees to indemnify and hold harmless the
         Company, its directors and officers and each Person, if any, who
         controls the Company within the meaning of either Section 15 of the
         Securities Act or Section 20 of the Exchange Act to the same extent as
         the foregoing indemnity from the Company to such Holder, but only with
         respect to information relating to such Holder furnished in writing by
         such Holder expressly for use in any Registration Statement or
         Prospectus, or any amendment thereto, or any preliminary prospectus. In
         case any action or proceeding shall be brought against the Company or
         directors or officers or any such controlling person, in respect of
         which indemnity may be sought against a Holder of Registrable
<PAGE>
         Securities, such Holder shall have the rights and duties given the
         Company and the Company or its directors or officers or such
         controlling person shall have the rights and duties given to each
         Holder by the preceding paragraph. In no event shall the liability of
         any selling Holder of Registrable Securities hereunder be greater in
         amount than the gross amount of the proceeds (before expenses and
         commissions) from the sale of Registrable Securities by such Holder
         pursuant to the Registration Statement giving rise to such
         indemnification obligation."

         4. The text of the second paragraph of Section 6(c) is hereby amended
in its entirety to read as set forth below, with the added text highlighted in
italics:

         "The Company and each Holder of Registrable Securities agree that it
         would not be just and equitable if contribution pursuant to this
         Section 7(c) were determined by pro rata allocation or by any other
         method of allocation which does not take account of the equitable
         considerations referred to in the immediately preceding paragraph.
         Notwithstanding the provisions of this Section 7(c), an Indemnified
         Holder shall not be required to contribute any amount in excess of the
         amount by which the total price at which the Registrable Securities
         sold by such Indemnified Holder or its affiliated Indemnified Holders
         pursuant to the Registration Statement and distributed to the public
         were offered to the public exceeds the amount of any damages which such
         Indemnified Holder or its affiliated Indemnified Holder, has otherwise
         been required to pay by reason of such untrue or alleged untrue
         statement or omission or alleged omission. No person guilty of
         fraudulent misrepresentation (within the meaning of Section 11(f) of
         the Securities Act) shall be entitled to contribution from any person
         who was not guilty of such fraudulent misrepresentation."

         5. This Amendment may be executed in multiple counterparts, each of
which shall be deemed an original for all purposes, and all of which together
shall constitute one instrument. Each such multiple counterpart of this
Amendment may be transmitted via facsimile or other similar electronic means,
and a facsimile of the signature of one or more of the undersigned shall be
deemed an original signature for all purposes and have the same force and effect
as a manually signed original.

         6. This Agreement shall be governed by and construed in accordance with
the laws of the State of California.

                  (Remainder of Page Intentionally Left Blank)
<PAGE>
         IN WITNESS WHEREOF, the parties have executed this Amendment as of the
date first written above.

KOMAG, INCORPORATED

By:   /s/ Kathleen A. Bayless
      --------------------------------------
Title: Chief Financial Officer
       -------------------------------------

JDS CAPITAL, L.P.

By: JDS Capital Management, LLC

By:/s/ Joseph Samberg
   -----------------------------------------
Title: Managing Member
       -------------------------------------

DIMENSIONAL PARTNERS, L.P.

By: JDS Asset Management, LLC

By:
   -----------------------------------------
Title:
      --------------------------------------

DIMENSIONAL PARTNERS, LTD.

By: JDS Capital Management, Inc.

By:/s/ Joseph Samberg
   -----------------------------------------
Title: President
       -------------------------------------

RUTLAND PARTNERS, L.P.

By: /s/ Fred Stein
   -----------------------------------------
Title: General Partner
      --------------------------------------

    (Signature page to Amendment No. 1 to the Registration Rights Agreement)_
<PAGE>
CITADEL EQUITY FUND LTD.

By: Citadel Limited Partnership
Its:  Portfolio Manager

By:  GLB Partners, L.P.
Its:   General Partner

By:  Citadel Investment Group, L.L.C.
Its:   General Partner

By:  /s/ Adam Cooper
   -----------------------------------------

CERBERUS PARTNERS, L.P.

By: Cerberus Associates LLC
Its: General Partner

By: /s/ Lauren Kreuter
   -----------------------------------------
Title: Vice President
      --------------------------------------

    (Signature page to Amendment No. 1 to the Registration Rights Agreement)_

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