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<SEC-DOCUMENT>0000902664-99-000147.txt : 19990217
<SEC-HEADER>0000902664-99-000147.hdr.sgml : 19990217
ACCESSION NUMBER:		0000902664-99-000147
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		19990216
GROUP MEMBERS:		JEFFREY N. VINIK
GROUP MEMBERS:		MARK D. HOSTETTER
GROUP MEMBERS:		MICHAEL S. GORDON
GROUP MEMBERS:		VGH PARTNERS L L C
GROUP MEMBERS:		VGH PARTNERS, L.L.C.
GROUP MEMBERS:		VINIK ASSET MANAGEMENT, L.L.C.
GROUP MEMBERS:		VINIK ASSET MANAGEMENT, L.P.
GROUP MEMBERS:		VINIK PARTNERS, L.P.

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			QLOGIC CORP
		CENTRAL INDEX KEY:			0000918386
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				330537669
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0330

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		
		SEC FILE NUMBER:	005-49863
		FILM NUMBER:		99542031

	BUSINESS ADDRESS:	
		STREET 1:		3545 HARBOR BLVD
		CITY:			COSTA MESA
		STATE:			CA
		ZIP:			92626
		BUSINESS PHONE:		7144382200

	MAIL ADDRESS:	
		STREET 1:		3545 HARBOR BOULEVARD
		CITY:			COSTA MESA
		STATE:			CA
		ZIP:			92626

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Q LOGIC CORP
		DATE OF NAME CHANGE:	19940201

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			VGH PARTNERS L L C
		CENTRAL INDEX KEY:			0001027145
		STANDARD INDUSTRIAL CLASSIFICATION:	 []
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		260 FRANKLIN STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
		BUSINESS PHONE:		6172045400

	MAIL ADDRESS:	
		STREET 1:		260 FRANKLIN STREET
		CITY:			BOSTON
		STATE:			MA
		ZIP:			02110
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<TEXT>

<PAGE>






                        SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                ________________

                                  SCHEDULE 13G
                                 (Rule 13d-102)
                                ________________

      INFORMATION TO BE INCLUDED IN STATEMENTS PURSUANT TO RULES 13d-1(b), (c)
              AND (d) AND AMENDMENTS THERETO FILED PURSUANT TO 13d-2
                 UNDER THE SECURITIES EXCHANGE ACT OF 1934
                            (Amendment No. 1)*


                                  Qlogic Corporation
                                 (Name of Issuer)

                         Common Stock, $.10 par value
                         (Title of Class of Securities)

                                    747277101
                                  (CUSIP Number)

                                 December 31, 1998
               (Date of Event Which Requires Filing of this Statement)


     Check the appropriate box to designate the rule pursuant to which this 
Schedule is filed:
     [ ]  Rule 13d-1(b)
     [X]  Rule 13d-1(c)
     [ ]  Rule 13d-1(d)

___________

     *  The remainder of this cover page shall be filled out for a reporting 
person's initial filing on this form with respect to the subject class of 
securities, and for any subsequent amendment containing information which 
would alter the disclosures provided in a prior cover page.


     The information required in the remainder of this cover page shall not be 
deemed to be "filed" for the purpose of Section 18 of the Securities Exchange 
Act of 1934 ("Act") or otherwise subject to the liabilities of that section of 
the Act but shall be subject to all other provisions of the Act (however, see 
the Notes).




<PAGE


Schedule 13G/A                                                    PAGE 2 OF 12

CUSIP No. 747277101
_____________________________________________________________________________
     (1)  NAME OF REPORTING PERSON 
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 
               VGH Partners, L.L.C.
_____________________________________________________________________________
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                    (a)  [ ] 
                                                                    (b)  [x] 
_____________________________________________________________________________
     (3)  SEC USE ONLY 

_____________________________________________________________________________
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION 
               Delaware
_____________________________________________________________________________

NUMBER OF      (5)  SOLE VOTING POWER 
                    0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                    26,000
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER 
                    0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER 
                    26,000
_____________________________________________________________________________
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON 
               26,000
_____________________________________________________________________________
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT 
          IN ROW (9) EXCLUDES CERTAIN SHARES                             [ ] 
_____________________________________________________________________________
    (11)  PERCENT OF CLASS REPRESENTED 
          BY AMOUNT IN ROW (9)           
               0.3%
_____________________________________________________________________________
    (12)  TYPE OF REPORTING PERSON
               OO
_____________________________________________________________________________


<PAGE


Schedule 13G/A                                                    PAGE 3 OF 12

CUSIP No. 747277101
_____________________________________________________________________________
     (1)  NAME OF REPORTING PERSON 
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 
               Vinik Partners, L.P.
_____________________________________________________________________________
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP 
                                                                    (a)  [ ] 
                                                                    (b)  [x] 
_____________________________________________________________________________
     (3)  SEC USE ONLY 

_____________________________________________________________________________
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION 
               Delaware
_____________________________________________________________________________

NUMBER OF      (5)  SOLE VOTING POWER 
                    0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                    26,000
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER 
                    0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER 
                    26,000
_____________________________________________________________________________
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON 
               26,000
_____________________________________________________________________________
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT 
          IN ROW (9) EXCLUDES CERTAIN SHARES                             [ ] 
_____________________________________________________________________________
    (11)  PERCENT OF CLASS REPRESENTED 
          BY AMOUNT IN ROW (9)           
               0.3%
_____________________________________________________________________________
    (12)  TYPE OF REPORTING PERSON
               PN
_____________________________________________________________________________


<PAGE>


Schedule 13G/A                                                    PAGE 4 OF 12

CUSIP No. 747277101
_____________________________________________________________________________
     (1)  NAME OF REPORTING PERSON 
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 
               Vinik Asset Management, L.P.
_____________________________________________________________________________
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
                                                                    (a)  [ ] 
                                                                    (b)  [x] 
_____________________________________________________________________________
     (3)  SEC USE ONLY 

_____________________________________________________________________________
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION 
               Delaware
_____________________________________________________________________________

NUMBER OF      (5)  SOLE VOTING POWER 
                    0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                    32,300
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER 
                    0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER 
                    32,300
_____________________________________________________________________________
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON 
               32,300
_____________________________________________________________________________
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT 
          IN ROW (9) EXCLUDES CERTAIN SHARES                             [ ] 
_____________________________________________________________________________
    (11)  PERCENT OF CLASS REPRESENTED 
          BY AMOUNT IN ROW (9)           
               0.4%
_____________________________________________________________________________
    (12)  TYPE OF REPORTING PERSON
               PN
_____________________________________________________________________________

<PAGE>


Schedule 13G/A                                                   PAGE 5 OF 12

CUSIP No. 747277101
_____________________________________________________________________________
     (1)  NAME OF REPORTING PERSON 
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 
               Jeffrey N. Vinik
_____________________________________________________________________________
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP    
                                                                    (a)  [ ] 
                                                                    (b)  [x] 
_____________________________________________________________________________
     (3)  SEC USE ONLY 

_____________________________________________________________________________
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION 
          United States
_____________________________________________________________________________

NUMBER OF      (5)  SOLE VOTING POWER 
                    0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                         58,300
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER 
                    0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER 
                         58,300
_____________________________________________________________________________
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON 
               58,300
_____________________________________________________________________________
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT 
          IN ROW (9) EXCLUDES CERTAIN SHARES                             [ ] 
_____________________________________________________________________________
    (11)  PERCENT OF CLASS REPRESENTED 
          BY AMOUNT IN ROW (9)           
               0.7%
_____________________________________________________________________________
    (12)  TYPE OF REPORTING PERSON   
               IN
_____________________________________________________________________________

<PAGE


Schedule 13G/A                                                   PAGE 6 OF 12

CUSIP No. 747277101
_____________________________________________________________________________
     (1)  NAME OF REPORTING PERSON 
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 
               Michael S. Gordon
_____________________________________________________________________________
     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP    
                                                                    (a)  [ ] 
                                                                    (b)  [x] 
_____________________________________________________________________________
     (3)  SEC USE ONLY 

_____________________________________________________________________________
     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION 
          United States
_____________________________________________________________________________

NUMBER OF      (5)  SOLE VOTING POWER 
                    0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                         58,300
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER 
                    0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER 
                         58,300
_____________________________________________________________________________
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON 
               58,300
_____________________________________________________________________________
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT 
          IN ROW (9) EXCLUDES CERTAIN SHARES                             [ ] 
_____________________________________________________________________________

    (11)  PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)
               0.7%
_____________________________________________________________________________
    (12)  TYPE OF REPORTING PERSON   
               IN
_____________________________________________________________________________

<PAGE


Schedule 13G/A                                                   PAGE 7 OF 12

CUSIP No. 747277101
_____________________________________________________________________________

     (1)  NAME OF REPORTING PERSON 
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 
               Mark D. Hostetter
_____________________________________________________________________________

     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP    
                                                                    (a)  [ ] 
                                                                    (b)  [x] 
_____________________________________________________________________________

     (3)  SEC USE ONLY 
_____________________________________________________________________________

     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION 
          United States
_____________________________________________________________________________

NUMBER OF      (5)  SOLE VOTING POWER 
                    0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                         58,300
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER 
                    0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER 
                         58,300
_____________________________________________________________________________
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON 
               58,300
_____________________________________________________________________________
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT 
          IN ROW (9) EXCLUDES CERTAIN SHARES                             [ ] 
_____________________________________________________________________________
    (11)  PERCENT OF CLASS REPRESENTED
          BY AMOUNT IN ROW (9)           
               0.7%
_____________________________________________________________________________
    (12)  TYPE OF REPORTING PERSON   
               IN
_____________________________________________________________________________
<PAGE


Schedule 13G/A                                                   PAGE 8 OF 12

CUSIP No. 747277101
_____________________________________________________________________________

     (1)  NAME OF REPORTING PERSON 
          S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON 
               Vinik Asset Management, L.L.C.
_____________________________________________________________________________

     (2)  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP    
                                                                    (a)  [ ] 
                                                                    (b)  [x] 
_____________________________________________________________________________

     (3)  SEC USE ONLY 
_____________________________________________________________________________

     (4)  CITIZENSHIP OR PLACE OF ORGANIZATION 
               Delaware
_____________________________________________________________________________

NUMBER OF      (5)  SOLE VOTING POWER 
                    0
SHARES         ______________________________________________________________

BENEFICIALLY   (6)  SHARED VOTING POWER
                         32,300
OWNED BY       ______________________________________________________________

EACH           (7)  SOLE DISPOSITIVE POWER 
                    0
REPORTING      ______________________________________________________________

PERSON WITH    (8)  SHARED DISPOSITIVE POWER 
                         32,300
_____________________________________________________________________________
     (9)  AGGREGATE AMOUNT BENEFICIALLY OWNED
          BY EACH REPORTING PERSON 
               32,300
_____________________________________________________________________________
    (10)  CHECK BOX IF THE AGGREGATE AMOUNT 
          IN ROW (9) EXCLUDES CERTAIN SHARES                             [ ] 
_____________________________________________________________________________
    (11)  PERCENT OF CLASS REPRESENTED 
          BY AMOUNT IN ROW (9)           
               0.4%
_____________________________________________________________________________
    (12)  TYPE OF REPORTING PERSON   
               OO
_____________________________________________________________________________
<PAGE


Schedule 13G/A                                                   PAGE 9 OF 12

           The Schedule 13G (the "Schedule 13G") initially filed on 
August 3, 1998 by VGH Partners, L.L.C. ("VGH"), Vinik Partners, L.P. 
("Vinik Partners"), Vinik Asset Management, L.P. ("VAM LP"), Jeffrey N. 
Vinik, Michael S. Gordon, Mark D. Hostetter, and Vinik Asset Management, 
L.L.C. ("VAM LLC") relating to the common stock, par value $.10 (the "Common 
Stock"), issued by Qlogic Corporation (the "Company") is hereby amended by 
this Amendment No. 1 to the Schedule 13G as follows:

ITEM 4.   OWNERSHIP.

Item 4 is hereby amended and restated as follows:

     A.  Vinik Partners and VGH
        (a)  Amount beneficially owned: 26,000
        (b)  Percent of class: 0.3%
          (All percentages herein are based on 8,742,481 shares of Common 
          Stock reported to be outstanding as of October 25, 1998, as 
          reflected in the Company's quarterly report on Form 10-Q filed 
          with the Securities and Exchange Commission by the Company for 
          the quarter ended September 27, 1998.)
        (c)  Number of shares as to which such person has:
                  (i)    sole power to vote or to direct the vote
                         0
                  (ii)   shared power to vote or to direct the vote 26,000
                  (iii)  sole power to dispose or to direct the disposition of
                         0
                  (iv)   shared power to dispose or to direct the disposition
                         of 26,000
                   Vinik Partners has the power to dispose of and the power to
                   vote the shares of Common Stock beneficially owned by it, 
                   which power may be exercised by its general partner, VGH.  
                   VGH owns directly no shares of Common Stock.  By reason of 
                   the provisions of Rule 13d-3 of the Securities Exchange Act 
                   of 1934 (the "Act"), VGH may be deemed to own beneficially 
                   the shares owned by Vinik Partners.

     B.  VAM LP and VAM LLC
        (a)  Amount beneficially owned: 32,300
        (b)  Percent of class: 0.4%
        (c)  Number of shares as to which such person has:
                  (i)    sole power to vote or to direct the vote
                         0
                  (ii)   shared power to vote or to direct the vote
                         32,300
                  (iii)  sole power to dispose or to direct the disposition of
                         0

<PAGE


Schedule 13G/A                                                   PAGE 10 OF 12

                  (iv)   shared power to dispose or to direct the disposition 
                         of 32,300
                   Vinik Overseas Fund, Ltd. ("Vinik Overseas") is a party to 
                   an investment management agreement with VAM LP pursuant to 
                   which VAM LP has investment authority with respect to 
                   securities held in such account.  Such authority includes 
                   the power to dispose of and the power to vote securities 
                   held in such account.  Such power may be exercised by VAM 
                   LP's general partner, VAM LLC.  Neither VAM LP nor VAM LLC 
                   owns directly any shares of Common Stock.  By reason of the 
                   provisions of Rule 13d-3 of the Act, VAM LP and VAM LLC may 
                   each be deemed to own beneficially shares held by Vinik 
                   Overseas.

     C.  Jeffrey N. Vinik, Michael S. Gordon and Mark D. Hostetter
        (a)  Amount beneficially owned: 58,300
        (b)  Percent of class: 0.7%
        (c)  Number of shares as to which such person has:
                  (i)    sole power to vote or to direct the vote
                         0
                  (ii)   shared power to vote or to direct the vote
                         58,300
                  (iii)  sole power to dispose or to direct the disposition of
                         0
                  (iv)   shared power to dispose or to direct the disposition 
                         of 58,300
                   Mr. Vinik, as the senior managing member of VGH and VAM 
                   LLC, and Messrs. Gordon and Hostetter, as managing members 
                   thereof, have shared power to dispose of and shared power 
                   to vote the Common Stock beneficially owned by VGH and VAM 
                   LLC.  None of Messrs. Vinik, Gordon and Hostetter directly 
                   own any shares of Common Stock.  By reason of the 
                   provisions of Rule 13d-3 of the Act, each may be deemed to 
                   beneficially own the shares beneficially owned by Vinik 
                   Partners and by Vinik Overseas.

ITEM 5.   OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.

          If this statement is being filed to report the fact that as of the 
date hereof the reporting person has ceased to be the beneficial owner of more 
than five percent of the class of securities check the following [x].

<PAGE


Schedule 13G/A                                                   PAGE 11 OF 12

ITEM 10.  CERTIFICATION.  (if filing pursuant to Rule 13d-1(c))

          By signing below each Reporting Person certify that, to the best of 
its knowledge and belief, the securities referred to above were not acquired 
and are not held for the purpose of or with the effect of changing or 
influencing the control of the issuer of the securities and were not acquired 
and not held in connection with or as a participant in any transaction having 
that purpose
or effect.

<PAGE>



Schedule 13G/A                                                   PAGE 12 OF 12

SIGNATURES

      After reasonable inquiry and to the best of our knowledge and belief, 
the undersigned certify that the information set forth in this statement is 
true, complete and correct.

DATED:  February 16, 1999           /s/ Jeffrey N. Vinik,
                                    JEFFREY N. VINIK, individually,
                                    as senior managing member of
                                    VGH Partners, L.L.C., on behalf
                                    of VINIK PARTNERS, L.P., as senior 
                                    managing member of Vinik Asset Management, 
                                    L.L.C., on behalf of VINIK ASSET 
                                    MANAGEMENT, L.P., as senior managing 
                                    member of VGH PARTNERS, L.L.C. and of 
                                    VINIK ASSET MANAGEMENT, L.L.C.

                                    /s/ Michael S. Gordon, individually
                                    MICHAEL S. GORDON

                                    /s/ Mark D. Hostetter, individually
                                    MARK D. HOSTETTER





<PAGE>

</TEXT>
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