13D Filing: Starboard Value LP and Quantum Corp (QTM)

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SIGNATURES

After reasonable
inquiry and to the best of his knowledge and belief, each of the undersigned certifies that the information set forth in this statement
is true, complete and correct.

Dated: November 15, 2017

STARBOARD VALUE AND OPPORTUNITY MASTER FUND LTD

By: Starboard Value LP,

its investment manager

Starboard Value and Opportunity
S LLC

By: Starboard Value LP,

its manager

Starboard Value and Opportunity
C LP

By: Starboard Value R LP,

its general partner

STARBOARD VALUE R LP

By: Starboard Value R GP LLC,

its general partner

STARBOARD VALUE LP

By: Starboard Value GP LLC,

its general partner

STARBOARD VALUE GP LLC

By: Starboard Principal Co LP,

its member

STARBOARD PRINCIPAL CO LP

By: Starboard Principal Co GP LLC,

its general partner

STARBOARD PRINCIPAL CO GP LLC

Starboard Value R GP LLC

By:

/s/ Jeffrey C. Smith

Name: Jeffrey C. Smith
Title: Authorized Signatory

/s/ Jeffrey C. Smith

Jeffrey C. Smith

Individually
and as attorney-in-fact for Mark R. Mitchell and Peter A. Feld

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