Exhibit 10.3

ADAPTEC CONFIDENTIAL

LOGO

November 17, 2009

John Westfield

[Address]

Dear John,

After careful consideration of our future business, we need to make some difficult business decisions, one of which
impacts your position. We regret to notify you that your position will be eliminated. Your last work date (separation date) and termination date will be December 4, 2009. Your final paycheck will include payout of your accrued vacation
balance. Your current health and dental benefits end on December 31, 2009.

We find these circumstances unfortunate and wish to offer you
severance benefits (outlined below) to assist you in pursuing other opportunities outside of Adaptec. The Severance Plan Summary information may be found on the Adaptec Intranet HR site under Benefits. (Link:
http://www.corp.adaptec.com/sites/hr/benefits/spds/index.htm.)

Please sign and return the Separation Agreement and General Release below
along with the exit paperwork to Adaptec Human Resources in the enclosed envelope no later than December 9, 2009.

SEPARATION AGREEMENT AND GENERAL RELEASE



|1. | Adaptecs Consideration for Agreement: In exchange for the release and agreements described herein, Adaptec agrees as follows:
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| | a) | On the eighth day following the date Adaptec receives a signed Agreement, and provided that you have returned all Adaptec property, equipment, and assets, to the
Company, your severance payment will be processed in a one time lump sum payment equal to 6 months and 1 week of your base pay, less legally mandated payroll deductions and withholdings. This payment is being given as consideration for this
Agreement and is not otherwise due.
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| | b) | You also acknowledge that Adaptec stock option grants that have vested as of the termination date must be exercised within three (3) months of termination.
However, stock options granted from plans assumed through acquisitions may vary.
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| | c) | Beginning on January 1, 2010, you shall be entitled to continuation of your Adaptec health, vision, dental, and Employee Assistance Program (EAP) benefits pursuant
to the Consolidated Omnibus Budget and Reconciliation Act (COBRA). You must submit completed COBRA Qualifying Event Notification enrollment forms directly to Benefit Concepts, Inc. for coverage. Adaptec agrees to pay the premiums for
those COBRA benefits through and until July 31, 2010. Effective August 1, 2010, you will be responsible for your COBRA cost. The COBRA enrollment packet and the information you will receive from Benefit Concepts will explain the
important details regarding the enrollment process.
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| | d) | You have until two months from your termination date to sign up for your career search program with Right Management Consultants. (pamphlet in folder)
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ADAPTEC CONFIDENTIAL



|2. | Your Consideration for Agreement: In consideration for the payments and undertakings described above, you individually and on behalf of your representatives,
successors, and assigns, do hereby completely release and forever discharge Adaptec, its shareholders, employees, owners, officers and directors, Board Members, and all other representatives, agents, entities, subsidiaries, divisions, directors,
attorneys, successors, and assigns from all claims, rights, demands, actions, obligations, and causes of action of any and every kind, nature and character, known or unknown, which you may now have, or have ever had, against them arising from or in
any way connected with the employment relationship between the parties, any actions during the relationship or the termination thereof. This Release covers all statutory, common law, constitutional and other claims, including but not limited to: all
wrongful discharge and constructive discharge claims; all claims relating to any contracts of employment, express or implied; any claims for defamation, misrepresentation, fraud, or breach of the covenant of good faith and
fair dealing, express or implied; any claim for negligent or intentional infliction of emotional distress; any claim for negligence; any claims for attorneys fees or costs; any tort claims of any nature; any claims under federal, state or
municipal statute or ordinance; any claims under the California Fair Employment and Housing Act, Title VII of the Civil Rights Act of 1964, the Civil Rights Act of 1991, 42 U.S.C. Section 1981, the Age Discrimination in Employment Act, the
Older Workers Benefit Protection Act, the Americans With Disabilities Act, the Employee Retirement Income Security Act, the California Labor and Civil Codes, the California Constitution, Federal Rehabilitation Act of 1973, Federal Family and
Medical Leave Act, the California Family Rights Act, the Worker Adjustment and Retraining Notification Act (WARN), CalWARN, and any other laws and regulations relating to employment, employment discrimination, and employment termination. This
release is not intended to and does not include a release of any claims which, by law, cannot be released.
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|3. | Wavier of Unknown Future Claims: You have read Section 1542 of the Civil Code of the State of California, which provides as follows:
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A general release does not extend to claims with the creditor does not know or suspect to exist in his favor at the time of executing the
release, which if known by him must have materially affected his settlement with the debtor.

You acknowledge that
Section 1542 gives you the right not to release existing claims, of which you are not now aware, unless you voluntarily choose to waive this right. Having been so apprised, you hereby voluntarily waive the rights described in Section 1542,
and elect to assume all risks for claims that now exist in your favor known or unknown, arising from the subject matter of this Agreement.



|4. | No Admission of Liability: This agreement is not and shall not be construed or contended by you to be an admission or evidence of any wrongdoing or liability on
the part of Releases, their representatives, heirs, executors, attorneys, agents, partners, officers, shareholders, directors, employees, subsidiaries, affiliates, divisions, successors or assigns. This agreement shall be afforded the maximum
protection allowable under California Evidence Code Section 1152 and/or any other state or federal provisions of similar effect.
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|5. | Confidentiality of Agreement: You agree that the existence, terms and conditions of this Agreement, including any and all references to any alleged underlying claims,
are strictly confidential. You shall not disclose, discuss or reveal the existence or the terms of this Agreement to any persons outside of Adaptec, entities or organizations except to your spouse, attorney, financial advisor, or as required by
court order.
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|6. | Savings Clause: Should any of the provisions of this Agreement be determined to be invalid by a court or government agency of competent jurisdiction, it is agreed that
such determination shall not affect the enforceability of the other provisions herein. California law shall govern the validity and interpretation of this Agreement.
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|7. | Preparation of Agreement: Regardless of which party initially drafted this Agreement, it shall not be construed against any one party, and shall be construed and
enforced as a mutually prepared Agreement.
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|8. | Mandatory Arbitration Clause: You and Adaptec agree that any action to enforce the terms and conditions of this Agreement or for the breach of this Agreement, shall be
referred to final and binding arbitration. Any arbitration proceeding will be governed by the rules and procedures of the American Arbitration
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ADAPTEC CONFIDENTIAL

Association and the Federal Arbitration Act and the parties hereto expressly waive their rights, if any, to have any such matters heard by a
court or jury, or administrative agency whether federal or state. The prevailing party in any arbitration to enforce this Agreement or remedy its breach will be entitled to costs and reasonable attorneys fees incurred.



|9. | Complete and Voluntary Agreement: This Agreement constitutes the entire understanding of the parties on the subjects covered. You expressly warrant that you have read
and fully understand this Agreement; that you have had the opportunity to seek legal counsel of your own choosing and to have the terms of the Agreement fully explained to you that you are not executing this Agreement in reliance on any promises,
representations or inducements other than those contained herein; and that you are executing this Release voluntarily, free of any duress or coercion. In addition, by signing this Agreement, you are confirming the following:
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| | (a) | You have been provided until December 9, 2009 in which to consider whether or not to sign this Agreement, and that, having been advised of that entitlement; you
may elect to sign this Agreement at any time prior to or on that date.
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| | (b) | You may revoke your acceptance of this Agreement within seven (7) calendar days of signing it with respect to claims arising under the Age Discrimination in
Employment Act (ADEA Rescission Period). To be effective, rescission must be in writing, delivered to Shirley Olerich, Adaptec Inc., 691 South Milpitas Blvd, M/S 15, Milpitas, CA 95035, within the ADEA Rescission Period, or sent to
Adaptec, at such address, by certified mail, return receipt requested, postmarked within the ADEA Rescission Period and also by facsimile to Attention: Shirley Olerich, FAX# (408) 262-2533, before the close of the ADEA Rescission Period.
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| | (c) | The consideration provided to you in this Agreement is in addition to any consideration that you would otherwise be entitled to receive; and
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| | (d) | You may submit any inquiries regarding the severance plan within one year of your separation from service, in writing, delivered to the Severance Plan Administrator,
691 South Milpitas Blvd, M/S 15, Milpitas, CA 95035 by certified mail, return receipt requested, and postmarked within the applicable period.
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Effective Date: This agreement is effective on the eighth (8th) day after you sign it and without revocation by you.

If you choose to accept the terms of this Agreement, please sign on the line provided below and return the original in the enclosed self addressed envelope.

Sincerely,



|                       
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|/s/    SUNDI SUNDARESH 
|Sundi Sundaresh        
|Chief Executive Officer

I have read and understand the
Agreement above and agree to be bound by its terms and conditions.

Agreed:



|       |  |          |  |     |  |                   |  |  |  |                         
|------ |  | -------- |  | --- |  | ----------------- |  |  |  | ------------------------
|Dated: |  | 11/17/09 |  | BY: |  | John M. Westfield |  |  |  | /s/    JOHN M. WESTFIELD
|       |  |          |  |     |  | Print             |  |  |  | (Signature)