EXHIBIT 10.3

EXECUTIVE RETENTION AGREEMENT

     On May 14, 2002, the United States Bankruptcy Court for the Northern
District of California entered an order confirming the “Debtor’s Further
Modified First Amended Plan of Reorganization, Dated May 7, 2002” (the “Plan”),
which provides for a reorganization (the “Reorganization”) of Komag, Inc., a
Delaware corporation (the “Company”). The Plan became effective by its terms on
June 30, 2002. This Agreement was originally entered into as of July 17, 2002
and is currently being reinstated as of May 4, 2005 (the “Effective Date”) by
and between the Company and William Hammack (“Executive”). The purpose of this
Agreement is to provide Executive with an incentive to remain employed as a key
executive of the Company following the Reorganization.

     1. Duties and Scope of Employment.

          (a) Positions and Duties. As of the Effective Date, Executive will
continue to serve as Vice President, Human Resources of the Company. Executive
will render such business and professional services in the performance of his
duties, consistent with Executive’s position within the Company, as shall
reasonably be assigned to him by the Company’s Board of Directors (the “Board”).
The period of Executive’s employment under this Agreement is referred to herein
as the “Employment Term.”

          (b) Obligations. During the Employment Term, Executive will perform
his duties faithfully and to the best of his ability and will devote his full
business efforts and time to the Company. For the duration of the Employment
Term, Executive agrees not to actively engage in any other employment,
occupation or consulting activity for any direct or indirect remuneration
without the prior approval of the Board.

          (c) Conflicting Employment. Executive agrees that, while employed by
the Company, he will not engage in any other employment, occupation, consulting
or other business activity directly related to the business in which the Company
is now involved or becomes involved during the term of Executive’s employment,
nor will Executive engage in any other activities that conflict with Executive’s
obligations to the Company.

     2. Term. Executive’s employment with the Company commenced on March 14,
2005, and shall continue, unless otherwise terminated earlier pursuant to the
terms of this Agreement, through July 16, 2005. After July 16, 2005, the parties
agree that Executive’s employment with the Company will be “at-will” employment
and may be terminated at any time with or without cause or notice.

     3. Compensation.

          (a) Base Salary. During the Employment Term, the Company will pay
Executive as compensation for his services a base salary at the annualized rate
of $187,554 (the “Base Salary”). The Base Salary will be paid periodically in
accordance with the Company’s normal payroll practices and may be subject to
annual adjustments by the Company after comparison of market data with
similarly-situated companies.

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          (b) Retention Bonus Plan. Following Executive’s employment date,
Executive will be eligible to participate in the Company’s Retention Bonus Plan.

     4. Employee Benefits. During the Employment Term, Executive will continue
to be entitled to participate in the employee benefit plans currently and
hereafter maintained by the Company of general applicability to other senior
executives of the Company, including, without limitation, the Company’s group
medical, dental, vision, disability, life insurance, vacation and
flexible-spending account plans and programs. The Company reserves the right to
cancel or change the benefit plans and programs it offers to its employees at
any time.

     5. Severance.

          (a) Involuntary Termination. If Executive’s employment with the
Company terminates other than voluntarily or for “Cause” (as defined herein),
and Executive signs and does not revoke a standard release of claims with the
Company, then Executive shall be entitled to receive a lump-sum severance
payment (the “Severance Payment”) equal to (A) x (B), where (A) = 2.99 and (B) =
the sum of (i) Executive’s annualized Base Salary rate, as then in effect,
(ii) all of Executive’s expected bonus payments to be made during the year in
which the termination occurs, if any, and (iii) the annualized value of
Executive’s benefits package with the Company as determined by the Company in
its reasonable discretion. The Severance Payment shall be made in a single lump
sum within thirty (30) days of termination. Notwithstanding the foregoing, the
Company shall not be obligated to make any payments pursuant to this Section
5(a) unless and until Executive has delivered to the Company an executed release
of all claims he or she has or may have against the Company, in form and
substance satisfactory to the Company.

          (b) Voluntary Termination; Termination for Cause. If Executive’s
employment with the Company terminates voluntarily by Executive or for Cause by
the Company, then (i) all vesting of any options to purchase shares of the
Company’s common stock held by Executive will terminate immediately and all
payments of compensation by the Company to Executive hereunder will terminate
immediately (except as to amounts already earned), and (ii) Executive will only
be eligible for severance or other benefits in accordance with the Company’s
established plans or policies as then in effect.

     6. Change of Control Benefits. In the event of a “Change of Control” (as
defined herein) followed by Executive’s termination other than voluntarily or
for “Cause” within six (6) months of the consummation of a Change of Control
Transaction, Executive shall be entitled to receive the Severance Payment within
thirty (30) days of such termination. For the purpose of this Section 6,
Executive shall be deemed to have been terminated other than for “Cause” if
Executive is not provided with an offer of comparable employment with the
Company or successor entity following the Change of Control with comparable
duties, position and responsibilities relative to the Executive’s duties,
position and responsibilities in effect immediately prior to such Change of
Control. Notwithstanding the foregoing, if Executive receives the Severance
Payment pursuant to this Section, he shall not be entitled to receive an
additional Severance Payment pursuant to Section 5 hereof.

     7. Non-Solicitation. For a period of twelve (12) months following
Executive’s termination of employment, Executive shall not, directly or

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indirectly, without the prior written consent of Parent, solicit, encourage or
take any other action which is intended to induce or encourage any employee or
customer of Parent or its subsidiaries to terminate his or her employment with
or customer relationship to Parent or its subsidiaries.

     8. Definitions.

          (a) Cause. For purposes of this Agreement, “Cause” is defined as
(i) an act of dishonesty made by Executive in connection with Executive’s
responsibilities as an employee, (ii) Executive’s conviction of, or plea of nolo
contendere to, a felony, (iii) Executive’s gross misconduct, or (iv) Executive’s
continued substantial violations of his employment duties after Executive has
received a written demand for performance from the Company which specifically
sets forth the factual basis for the Company’s belief that Executive has not
substantially performed his duties.

          (b) Change of Control. For purposes of this Agreement, “Change of
Control” of the Company is defined as: (i) any “person” (as such term is used in
Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended) is
or becomes the “beneficial owner” (as defined in Rule 13d-3 under said Act),
directly or indirectly, of securities of the Company representing 50% or more of
the total voting power represented by the Company’s then outstanding voting
securities; or (ii) the date of the consummation of a merger or consolidation of
the Company with any other corporation that has been approved by the
stockholders of the Company, other than a merger or consolidation which would
result in the voting securities of the Company outstanding immediately prior
thereto continuing to represent (either by remaining outstanding or by being
converted into voting securities of the surviving entity) more than fifty
percent (50%) of the total voting power represented by the voting securities of
the Company or such surviving entity outstanding immediately after such merger
or consolidation, or the stockholders of the Company approve a plan of complete
liquidation of the Company; or (iii) the date of the consummation of the sale or
disposition by the Company of all or substantially all the Company’s assets.

     9. Assignment. This Agreement will be binding upon and inure to the benefit
of (a) the heirs, executors and legal representatives of Executive upon
Executive’s death and (b) any successor of the Company. Any such successor of
the Company will be deemed substituted for the Company under the terms of this
Agreement for all purposes. For this purpose, “successor” means any person,
firm, corporation or other business entity which at any time, whether by
purchase, merger or otherwise, directly or indirectly acquires all or
substantially all of the assets or business of the Company. None of the rights
of Executive to receive any form of compensation payable pursuant to this
Agreement may be assigned or transferred except by will or the laws of descent
and distribution. Any other attempted assignment, transfer, conveyance or other
disposition of Executive’s right to compensation or other benefits will be null
and void.

     10. Notices. All notices, requests, demands and other communications called
for hereunder shall be in writing and shall be deemed given (i) on the date of
delivery if delivered personally, (ii) one (1) day after being sent by a well
established commercial overnight service, or (iii) four (4) days after being
mailed by registered or certified mail, return receipt requested, prepaid and
addressed to the parties or their successors at the following addresses, or at
such other addresses as the parties may later designate in writing:

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If to the Company:
Komag, Inc.
1710 Automation Parkway
San Jose, California 95131
Attn: Chief Financial Officer

If to Executive:
William Hammack

     11. Severability. In the event that any provision hereof becomes or is
declared by a court of competent jurisdiction to be illegal, unenforceable or
void, this Agreement will continue in full force and effect without said
provision.

     12. Arbitration.

          (a) General. In consideration of Executive’s service to the Company,
its promise to arbitrate all employment related disputes and Executive’s receipt
of the compensation, pay raises and other benefits paid to Executive by the
Company, at present and in the future, Executive agrees that any and all
controversies, claims, or disputes with anyone (including the Company and any
employee, officer, director, shareholder or benefit plan of the Company in their
capacity as such or otherwise) arising out of, relating to, or resulting from
Executive’s service to the Company under this Agreement or otherwise or the
termination of Executive’s service with the Company, including any breach of
this Agreement, shall be subject to binding arbitration under the Arbitration
Rules set forth in California Code of Civil Procedure Section 1280 through
1294.2, including Section 1283.05 (the “RULES”) and pursuant to California law.
Disputes which Executive agrees to arbitrate, and thereby agrees to waive any
right to a trial by jury, include any statutory claims under state or federal
law, including, but not limited to, claims under Title VII of the Civil Rights
Act of 1964, the Americans with Disabilities Act of 1990, the Age Discrimination
in Employment Act of 1967, the Older Workers Benefit Protection Act, the
California Fair Employment and Housing Act, the California Labor Code, claims of
harassment, discrimination or wrongful termination and any statutory claims.
Executive further understands that this Agreement to arbitrate also applies to
any disputes that the Company may have with Executive.

          (b) Procedure. Executive agrees that any arbitration will be
administered by the American Arbitration Association (“AAA”) and that a neutral
arbitrator will be selected in a manner consistent with its National Rules for
the Resolution of Employment Disputes. The arbitration proceedings will allow
for discovery according to the rules set forth in the National Rules for the
Resolution of Employment Disputes or California Code of Civil Procedure.
Executive agrees that the arbitrator shall have the power to decide any motions
brought by any party to the arbitration, including motions for summary judgment
and/or adjudication and motions to dismiss and demurrers, prior to any
arbitration hearing. Executive agrees that the arbitrator shall issue a written
decision on the merits. Executive also agrees that the arbitrator shall have the
power to award any remedies, including attorneys’ fees and costs, available
under applicable law. Executive understands the Company will pay for any
administrative or hearing fees charged by the arbitrator or AAA except that
Executive shall pay the first $200.00 of any filing fees associated with any
arbitration Executive initiates. Executive agrees that the arbitrator shall
administer and conduct any arbitration in a manner consistent with the Rules

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and that to the extent that the AAA’s National Rules for the Resolution of
Employment Disputes conflict with the Rules, the Rules shall take precedence.

          (c) Remedy. Except as provided by the Rules, arbitration shall be the
sole, exclusive and final remedy for any dispute between Executive and the
Company. Accordingly, except as provided for by the Rules, neither Executive nor
the Company will be permitted to pursue court action regarding claims that are
subject to arbitration. Notwithstanding, the arbitrator will not have the
authority to disregard or refuse to enforce any lawful Company policy, and the
arbitrator shall not order or require the Company to adopt a policy not
otherwise required by law which the Company has not adopted.

          (d) Availability of Injunctive Relief. In addition to the right under
the Rules to petition the court for provisional relief, Executive agrees that
any party may also petition the court for injunctive relief where either party
alleges or claims a violation of this Agreement or the Confidentiality Agreement
or any other agreement regarding trade secrets, confidential information,
nonsolicitation or Labor Code Section 2870. In the event either party seeks
injunctive relief, the prevailing party shall be entitled to recover reasonable
costs and attorneys fees.

          (e) Administrative Relief. Executive understands that this Agreement
does not prohibit Executive from pursuing an administrative claim with a local,
state or federal administrative body such as the Department of Fair Employment
and Housing, the Equal Employment Opportunity Commission or the workers’
compensation board. This Agreement does, however, preclude Executive from
pursuing court action regarding any such claim.

          (f) Voluntary Nature of Agreement. Executive acknowledges and agrees
that Executive is executing this Agreement voluntarily and without any duress or
undue influence by the Company or anyone else. Executive further acknowledges
and agrees that Executive has carefully read this Agreement and that Executive
has asked any questions needed for Executive to understand the terms,
consequences and binding effect of this Agreement and fully understand it,
including that Executive is waiving Executive’s right to a jury trial. Finally,
Executive agrees that Executive has been provided an opportunity to seek the
advice of an attorney of Executive’s choice before signing this Agreement.

     13. Existing Agreements. This Agreement does not supersede and replace any
prior severance or retention plans or agreements that Executive may have entered
into with the Company prior to the Effective Date (the “Existing Agreements”).

     14. Integration. This Agreement, together with any Existing Agreements,
represents the entire agreement and understanding between the parties as to the
subject matter herein and supersedes all prior or contemporaneous agreements
whether written or oral. No waiver, alteration, or modification of any of the
provisions of this Agreement will be binding unless in writing and signed by
duly authorized representatives of the parties hereto.

     15. Tax Withholding. All payments made pursuant to this Agreement will be
subject to withholding of applicable taxes.

     16. Governing Law. This Agreement will be governed by the laws of the State
of California (with the exception of its conflict of laws provisions).

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     17. Acknowledgment. Executive acknowledges that he has had the opportunity
to discuss this matter with and obtain advice from his private attorney, has had
sufficient time to, and has carefully read and fully understands all the
provisions of this Agreement, and is knowingly and voluntarily entering into
this Agreement.

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     IN WITNESS WHEREOF, each of the parties has executed this Agreement, in the
case of the Company by their duly authorized officers, as of the day and year
first above written.

COMPANY:

              KOMAG, INC.        
 
           
By:
      Date:    

            Title: Chief Executive Officer        
 
            EXECUTIVE:        
 
      Date:              
William Hammack
     

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