FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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(Print or Type Responses)

1. Name and Address of Reporting Person * B. Riley Financial, Inc.   2. Issuer Name and Ticker or Trading Symbol QUANTUM CORP /DE/ [QMCO] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director __X__ 10% Owner _____ Officer (give title below) _____ Other (specify below) (Last) (First) (Middle) 21255 BURBANK BLVD., SUITE 400 3. Date of Earliest Transaction (Month/Day/Year) 01/18/2019 (Street) WOODLAND HILLS, CA 91367 4. If Amendment, Date Original Filed(Month/Day/Year) 6. Individual or Joint/Group Filing(Check Applicable Line) ___ Form filed by One Reporting Person _X_ Form filed by More than One Reporting Person (City) (State) (Zip) Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned

1.Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year) 2A. Deemed Execution Date, if any (Month/Day/Year) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 01/18/2019   P   31,808 A $ 1.8546 969,900 I See notes (1) (2) (3) Common Stock 01/18/2019   P   17,503 A $ 1.6923 (5) 3,546,580 I See notes (1) (2) (4) Common Stock 01/22/2019   P   81,082 A $ 1.8027 (6) 3,627,662 I See notes (1) (2) (4)

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)

1. Title of Derivative Security (Instr. 3)

2. Conversion or Exercise Price of Derivative Security

3. Transaction Date (Month/Day/Year)

3A. Deemed Execution Date, if any (Month/Day/Year)

4. Transaction Code (Instr. 8)

5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5)

6. Date Exercisable and Expiration Date (Month/Day/Year)

7. Title and Amount of Underlying Securities (Instr. 3 and 4)

8. Price of Derivative Security (Instr. 5)

9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)

10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)

11. Nature of Indirect Beneficial Ownership (Instr. 4)

Code

V

(A)

(D)

Date Exercisable

Expiration Date

Title

Amount or Number of Shares

Reporting Owners

Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
B. Riley Financial, Inc. 21255 BURBANK BLVD. SUITE 400 WOODLAND HILLS, CA 91367		X
BRC Partners Opportunity Fund, LP 11100 SANTA MONICA BLVD. SUITE 800 LOS ANGELES, CA 90025		X
BRC Partners Management GP, LLC 11100 SANTA MONICA BLVD SUITE 800 LOS ANGELES, CA 90025		X
B. RILEY CAPITAL MANAGEMENT, LLC 11100 SANTA MONICA BLVD. SUITE 800 LOS ANGELES, CA 90025		X
B. Riley FBR, Inc. 11100 SANTA MONICA BLVD SUITE 800 LOS ANGELES, CA 90025		X
Dialectic Antithesis Partners, LP 119 ROWAYTON AVENUE 2ND FLOOR NORWALK, CT 06853		X
BR Dialectic Capital Management, LLC 119 ROWAYTON AVENUE 2ND FLOOR NORWALK, CT 06853		X

Signatures

B. Riley Financial, Inc., by: /s/ Bryant R. Riley, Co-Chief Executive Officer		01/23/2019
**Signature of Reporting Person		Date
BRC Partners Opportunity Fund, L.P., by: /s/ Bryant R. Riley, Chief Investment Officer		01/23/2019
**Signature of Reporting Person		Date
BRC Partners Management GP, LLC, by B. Riley Capital Management, LLC, its sole member, by: /s/ Bryant R. Riley, Chief Executive Officer		01/23/2019
**Signature of Reporting Person		Date
B. Riley Capital Management, LLC, by: /s/ Bryant R. Riley, Chief Executive Officer		01/23/2019
**Signature of Reporting Person		Date
B. Riley FBR, Inc., by: /s/ Andy Moore, Chief Executive Officer		01/23/2019
**Signature of Reporting Person		Date
Dialectic Antithesis Partners, LP, by: /s/ John Fichthorn, Portfolio Manager		01/23/2019
**Signature of Reporting Person		Date
BR Dialectic Capital Management, LLC, by B. Riley Capital Management, LLC, its sole member, by: /s/ Bryant R. Riley, Chief Executive Officer		01/23/2019
**Signature of Reporting Person		Date

Explanation of Responses:

*	If the form is filed by more than one reporting person, see Instruction 4(b)(v).
**	Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
(1)	In 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").
(2)	BRPGP 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.
(3)	Represents shares of Common Stock owned directly by Dialectic.
(4)	Represents shares of Common Stock owned directly by BRFBR.
(5)	The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.646 to $1.70, 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.
(6)	The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.76 to $1.82, 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.

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

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