Security	Date	Code	Shares	Price	A/D	Owned after	D/I	Nature of ownership
Common Stock^F1,F2,F3	Dec 27, 2018	P	38,092	$1.4908	A	938,092	I	See notes
Common Stock^F1,F2,F4	Dec 27, 2018	P	253,801	$1.2469	A	1,493,801	I	See notes
Common Stock^F1,F2,F5	Dec 27, 2018	P	100,000	$1.20	A	1,537,696	I	See notes
Common Stock^F6,F1,F2,F5	Dec 28, 2018	P	125,000	$1.9058	A	1,662,696	I	See notes

Table II — derivative securities

No Table II lines on this filing.

Explanation of responses

F1In addition to B. Riley Financial, Inc., a Delaware corporation ("BRF"), this Form 3 is being filed jointly by BRC Partners Opportunity Fund, L.P., a Delaware limited partnership ("BRPLP"), B. Riley Capital Management, LLC, a New York limited liability company ("BRCM"), BRC Partners Management GP, LLC, a Delaware limited liability company ("BRPGP"), B. Riley FBR, Inc., a Delaware corporation ("BRFBR"), Dialectic Antithesis Partners, LP, a Delaware limited partnership ("Dialectic") and BR Dialectic Capital Management, LLC, a Delaware limited liability company (collectively, the "Filing Persons").
F2BRPGP is the general partner of BRPLP, BRCM is an investment advisor to BRPLP and BRF is the parent company of BRCM. As a result, BRPGP, BRCM and BRF may be deemed to indirectly beneficially own the Shares held by BRPLP. BRF is the parent company of BRFBR. As a result, BRF may be deemed to indirectly beneficially own the Shares held by BRFBR. BR Dialectic is the general partner and investment manager of Dialectic. BRCM is the parent company of BR Dialectic and BRF is the parent company of BRCM. As a result, BR Dialectic, BRCM and BRF may be deemed to indirectly beneficially own the Shares held by Dialectic. Each of the Filing Persons disclaims beneficial ownership of the outstanding shares of Common Stock ("Common Stock"), of Quantum Corporation, a Delaware corporation (the "Issuer"), reported herein except to the extent of its pecuniary interest therein.
F3Represents shares of Common Stock owned directly by Dialectic.
F4Represents shares of Common Stock owned directly by BRPLP.
F5Represents shares of Common Stock owned directly by BRFBR.
F6The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.875 to $1.92, inclusive. The Filing Persons reporting person undertakes to provide to the Commission, upon request, full information regarding the number of shares sold at each separate price.

Remarks

Each of the Filing Persons may be deemed to beneficially own the securities of the Issuer owned by the other Filing Persons. The filing of this Form 4 shall not be deemed an admission that the Filing Persons are the beneficial owners of any securities of the Issuer it does not directly own. Each of the Filing Persons specifically disclaims beneficial ownership of the securities reported herein that it does not directly own.