Exhibit 10.4

Quantum Corporation
1650 Technology Drive
Suite 700
San Jose, CA 95110-1382

[408] 944-4000

www.quantum.com

August 7, 2013

Mr. Gregg J. Powers
[ Address ]

Dear Gregg:

We are very pleased to offer you the opportunity to serve on the Board of
Directors of Quantum Corporation.

As a member of the Board of Directors and the Corporate Governance and
Nominating Committee of the Board, you are entitled to receive cash and equity
compensation in accordance with Quantum’s standard Board compensation program.

To confirm your acceptance of our offer, please sign one copy of this letter,
complete the enclosed documents, and return them in the enclosed envelope.
Please note that your membership on the Board becomes effective as of August 7,
2013, as the Board of Directors’ have already approved your appointment.

Gregg, we are very enthusiastic about you joining our Board of Directors. If you
have any questions, please do not hesitate to contact me. Again, it is a
pleasure to welcome you to Quantum Corporation.

Sincerely,

/Shawn Hall/

Shawn Hall
SVP, General Counsel & Secretary
Quantum Corporation
(408) 944-4460

--------------------------------------------------------------------------------

Gregg J. Powers
August 7, 2013
Page 2 of 2

I understand and accept the terms of this agreement and agree to comply with all
Quantum and Board policies and procedures, including those described in
Quantum’s Business Conduct and Ethic’s Policy, Section 16 Policy, Insider
Trading Policy, and Corporate Governance Principles.

      Signed:            /Gregg J. Powers/ Date:            August 7, 2013  
          Gregg J. Powers

  Start Date:           August 7, 2013

 

Enclosures:        Return Envelope        Deferred Compensation Program overview
and forms        Director Change in Control Agreement        Director
Indemnification Agreement        The High Road: Quantum’s Business Conduct &
Ethics Policy        Section 16 Policy Documentation        Insider Trading
Policy        Corporate Governance Principles   

cc:       Compensation      Legal

2

--------------------------------------------------------------------------------