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 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 *
BARRETT BARBARA
   2. Issuer Name and Ticker or Trading Symbol
QUANTUM CORP /DE/ [QTM] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
_____ Director _____ 10% Owner
__X__ Officer (give title below) _____ Other (specify below)
VP, Human Resources
(Last)
(First)
(Middle)
1650 TECHNOLOGY DRIVE, SUITE 700		 3. Date of Earliest Transaction (Month/Day/Year)
06/30/2007
(Street)

SAN JOSE, CA 95110		 4. If Amendment, Date Original Filed(Month/Day/Year)
 6. Individual or Joint/Group Filing(Check Applicable Line)
_X_ Form filed by One Reporting Person
___ 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 07/01/2007   F(1) V 659 D $ 3.19 234,407 D  
Common Stock 07/01/2007   F(1) V 533 D $ 3.19 233,874 D  

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
Restricted Stock Unit (2) 06/30/2007   A     35,000   (3)   (3) DSS Common Stock 35,000 $ 0 270,066 D  
Non Qualified Stock Options $ 3.17 06/30/2007   A     105,000 07/01/2008(4) 07/01/2014 Common Stock (5) 105,000 $ 3.17 105,000 D  

Reporting Owners

Reporting Owner Name / Address Relationships
 Director  10% Owner  Officer  Other
BARRETT BARBARA
1650 TECHNOLOGY DRIVE, SUITE 700
SAN JOSE, CA 95110		       VP, Human Resources  

Signatures

 /s/ Shawn Hall, Shawn Hall, Attorney in Fact for Barbara Barrett   07/03/2007
**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) Surrender of shares to satisfy tax withholding obligations upon vesting of Restricted Stock granted on 6/7/04 and 6/28/05.
(2) Restricted Stock Units convert to shares of Common Stock on a 1-for-1 basis.
(3) Restricted Stock Units will vest over a period of three (3) years in three equal installments - 33% at each anniversary of the vest begin date as follows: 7/1/08, 7/1/09 and 7/1/10.
(4) Stock Options will vest over a period of three (3) years in three equal installments - 33% at each anniversary of the vest begin date as follows: 7/1/08, 7/1/09 and 7/1/10.
(5) Right to buy granted under Rule 16b-3 Plan.

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