Ownership Submission
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 *
STEEL PARTNERS II LP
   2. Issuer Name and Ticker or Trading Symbol
ADAPTEC INC [ADPT] 		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)
C/O STEEL PARTNERS HOLDINGS L.P., 590 MADISON AVENUE, 32ND FLOOR		 3. Date of Earliest Transaction (Month/Day/Year)
06/15/2010
(Street)

NEW YORK, NY 10022		 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, $.001 Par Value 06/15/2010   P   396,300 A $ 3.0627 28,659,551 D (1) (2)  
Common Stock, $.001 Par Value 06/15/2010   P   130,067 A $ 3.0418 28,789,618 D (1) (2)  
Common Stock, $.001 Par Value 06/16/2010   P   70,400 A $ 3.0278 28,860,018 D (1) (2)  
Common Stock, $.001 Par Value 06/16/2010   P   105,300 A $ 3.027 28,965,318 D (1) (2)  
Common Stock, $.001 Par Value 06/16/2010   P   125,000 A $ 3.018 29,090,318 D (1) (2)  
Common Stock, $.001 Par Value 06/17/2010   P   75,000 A $ 3.0067 29,165,318 D (1) (2)  
Common Stock, $.001 Par Value 06/17/2010   P   19,400 A $ 3.001 29,184,718 D (1) (2)  

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
STEEL PARTNERS II LP
C/O STEEL PARTNERS HOLDINGS L.P.
590 MADISON AVENUE, 32ND FLOOR
NEW YORK, NY 10022		     X    
Steel Partners LLC
C/O STEEL PARTNERS HOLDINGS L.P.
590 MADISON AVENUE, 32ND FLOOR
NEW YORK, NY 10022		     X    
LICHTENSTEIN WARREN G
C/O STEEL PARTNERS HOLDINGS L.P.
590 MADISON AVENUE, 32ND FLOOR
NEW YORK, NY 10022		     X    
STEEL PARTNERS HOLDINGS L.P.
590 MADISON AVENUE, 32ND FLOOR
NEW YORK, NY 10022		     X    

Signatures

 By: Steel Partners II, L.P., By: Steel Partners II GP LLC, General Partner, By: /s/ Sanford Antignas, Chief Operating Officer   06/18/2010
**Signature of Reporting Person Date
 By: Steel Partners LLC, By: /s/ Sanford Antignas, Chief Operating Officer   06/18/2010
**Signature of Reporting Person Date
 By: /s/ Sanford Antignas, as Attorney in Fact for Warren G. Lichtenstein   06/18/2010
**Signature of Reporting Person Date
 By: Steel Partners Holdings L.P., By: Steel Partners Holdings GP LLC, General Partner, By: /s/ Sanford Antignas, Chief Operating Officer   06/18/2010
**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) This Form 4 is filed jointly by Steel Partners II, L.P. ("Steel Partners II"), Steel Partners Holdings L.P. ("Steel Holdings"), Steel Partners LLC ("Partners LLC") and Warren G. Lichtenstein. Steel Holdings, Partners LLC and Mr. Lichtenstein may be deemed to be 10% owners of the Issuer and Steel Partners II is a 10% owner of the Issuer.
(2) The securities reported in this Form 4 are owned directly by Steel Partners II, and owned indirectly by Steel Holdings by virtue of it being the sole limited partner of Steel Partners II, by Partners LLC by virtue of it being the manager of Steel Partners II and Steel Holdings and by Mr. Lichtenstein by virtue of his position as the manager of Partners LLC. Steel Holdings, Partners LLC and Mr. Lichtenstein disclaim beneficial ownership of the shares owned by Steel Partners II except to the extent of their pecuniary interest therein.

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