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

H.

Principal Co

(a)

Principal Co, as a member of Starboard Value GP, may be deemed the beneficial owner of the (i) 534,661 Shares owned by Starboard V&O Fund, (ii) 119,844 Shares owned by Starboard S LLC, (iii) 97,846 Shares owned by Starboard C LP and (iv) 187,521 Shares held in the Starboard Value LP Account.

Percentage: Approximately 2.7%

(b)

1. Sole power to vote or direct vote: 939,872 2. Shared power to vote or direct vote: 0 3. Sole power to dispose or direct the disposition: 939,872 4. Shared power to dispose or direct the disposition: 0

(c)

Principal Co has not entered into any transactions in the Shares during the past sixty days. Other than the Notes having matured (as defined and described in Item 6 below), each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and Starboard Value LP through the Starboard Value LP Account have not transacted in the Shares during the past sixty days.

I.

Principal GP

(a)

Principal GP, as the general partner of Principal Co, may be deemed the beneficial owner of the (i) 534,661 Shares owned by Starboard V&O Fund, (ii) 119,844 Shares owned by Starboard S LLC, (iii) 97,846 Shares owned by Starboard C LP and (iv) 187,521 Shares held in the Starboard Value LP Account.

Percentage: Approximately 2.7%

(b)

1. Sole power to vote or direct vote: 939,872 2. Shared power to vote or direct vote: 0 3. Sole power to dispose or direct the disposition: 939,872 4. Shared power to dispose or direct the disposition: 0

(c)

Principal GP has not entered into any transactions in the Shares during the past sixty days. Other than the Notes having matured (as defined and described in Item 6 below), each of Starboard V&O Fund, Starboard S LLC, Starboard C LP and Starboard Value LP through the Starboard Value LP Account have not transacted in the Shares during the past sixty days.

J.

Messrs. Mitchell and Feld

(a)

Each of Messrs. Mitchell and Feld, as a member of Principal GP and as a member of each of the Management Committee of Starboard Value GP and the Management Committee of Principal GP, may be deemed the beneficial owner of the (i) 534,661 Shares owned by Starboard V&O Fund, (ii) 119,844 Shares owned by Starboard S LLC, (iii) 97,846 Shares owned by Starboard C LP and (iv) 187,521 Shares held in the Starboard Value LP Account.

Percentage: Approximately 2.7%