HMT TECHNOLOGY CORP
SC 13G/A, 2000-02-14
COMPUTER STORAGE DEVICES
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                  SCHEDULE 13G


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 3 )*


                           HMT Technology Corporation
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                          Common Stock, $.001 par value
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    40391710
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                December 31, 1999
- --------------------------------------------------------------------------------
             (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)
                     [ ]  Rule 13d-1(c)
                     [X]  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 1 of 38 Pages
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 2 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Ventures III, L.P.
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware limited partnership
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 3 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Partners III, L.P.
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware limited partnership
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 4 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Subordinated Debt Fund, L.P.
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware limited partnership
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 5 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Ventures IV, L.P.
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware limited partnership
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 6 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Partners IV, L.P.
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware limited partnership
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 7 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Partners SD, L.P.
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware limited partnership
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 8 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Summit Investors II, L.P.
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Delaware limited partnership
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 9 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Stamps, Woodsum & Co. III
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Massachusetts general partnership
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 10 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Stamps, Woodsum & Co. IV
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        Massachusetts general partnership
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        PN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 11 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        E. Roe Stamps, IV
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 12 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Stephen G. Woodsum
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 13 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Gregory M. Avis
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 14 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Martin J. Mannion
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 15 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Bruce R. Evans
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 16 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Thomas S. Roberts
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

- ---------------------                                        -------------------
CUSIP NO.    40391710                 13G                    PAGE 17 OF 38 PAGES
- ---------------------                                        -------------------

================================================================================
  1     NAMES OF REPORTING PERSONS
        I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)

        Walter G. Kortschak
- --------------------------------------------------------------------------------
  2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP *
                                                                 (a)[ ]
                                                                 (b)[ ]
- --------------------------------------------------------------------------------
  3     SEC USE ONLY


- --------------------------------------------------------------------------------
  4     CITIZENSHIP OR PLACE OF ORGANIZATION

        United States
- --------------------------------------------------------------------------------
                           5    SOLE VOTING POWER

                                0 shares
        NUMBER OF          -----------------------------------------------------
         SHARES            6    SHARED VOTING POWER
      BENEFICIALLY
        OWNED BY                2,733,940 shares
          EACH             -----------------------------------------------------
        REPORTING          7    SOLE DISPOSITIVE POWER
         PERSON
          WITH:                 0 shares
                           -----------------------------------------------------
                           8    SHARED DISPOSITIVE POWER

                                2,733,940 shares
- --------------------------------------------------------------------------------
  9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        2,733,940 shares
- --------------------------------------------------------------------------------
 10     CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES *
        [ ]
- --------------------------------------------------------------------------------
 11     PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

        6.0%
- --------------------------------------------------------------------------------
 12     TYPE OF REPORTING PERSON *

        IN
================================================================================
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
<PAGE>

                                  Schedule 13G
                                  ------------


ITEM 1(A).        NAME OF ISSUER:  HMT Technology Corporation

ITEM 1(B).        ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES: 1055 Page
                  Avenue, Fremont, CA 94538

ITEM 2(A).        NAMES OF PERSONS FILING: Summit Ventures III, L.P., Summit
                  Partners III, L.P., Summit Ventures IV, L.P., Summit Partners
                  IV, L.P., Summit Partners SD, L.P, Summit Subordinated Debt
                  Fund, L.P., Summit Investors II, L.P., Stamps, Woodsum & Co.
                  III, Stamps, Woodsum & Co. IV, and Messrs. E. Roe Stamps, IV,
                  Stephen G. Woodsum, Gregory M. Avis, Martin J. Mannion, Bruce
                  R. Evans, Thomas S. Roberts, and Walter G. Kortschak.

                  Summit Partners III, L.P. is the sole general partner of
                  Summit Ventures III, L.P. Summit Partners IV, L.P. is the sole
                  general partner of Summit Ventures IV, L.P. Summit Partners
                  SD, L.P. is the sole general partner of Summit Subordinated
                  Debt Fund, L.P. Stamps, Woodsum & Co. III is the sole general
                  partner of each of Summit Partners III, L.P., and Summit
                  Partners SD L.P. Stamps, Woodsum & Co. IV is the sole general
                  partner of Summit Partners IV, L.P. Messrs. Stamps, Woodsum,
                  Avis, Mannion, Evans, Roberts and Kortschak are individual
                  general partners of Stamps, Woodsum & Co. III, Stamps, Woodsum
                  & Co. IV and Summit Investors II, L.P.

ITEM 2(B).        ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:
                  The address of the principal business office of Summit
                  Ventures III, L.P., Summit Ventures IV, L.P., Summit
                  Subordinated Debt Fund, L.P., Summit Investors II, L.P.,
                  Summit Partners III, L.P., Summit Partners IV, L.P., Summit
                  Partners SD, L.P., Stamps, Woodsum & Co. III, Stamps, Woodsum
                  & Co. IV, and Messrs. Stamps, Woodsum, Mannion, Evans, and
                  Roberts is Summit Partners, 600 Atlantic Avenue, Boston,
                  Massachusetts 02210. The address of the principal business
                  office of Messrs. Avis and Kortschak is Summit Partners, 499
                  Hamilton Avenue, Palo Alto, California 94301.

ITEM 2(C).        CITIZENSHIP: Each of Summit Ventures III, L.P., Summit
                  Partners III, L.P., Summit Ventures IV, L.P., Summit Partners
                  IV, L.P., Summit Investors II, L.P., Summit Subordinated Debt
                  Fund, L.P. and Summit Partners SD, L.P. is a limited
                  partnership organized under the laws of the State of Delaware.
                  Each of Stamps, Woodsum & Co. III and Stamps, Woodsum & Co. IV
                  is a general partnership organized under the laws of the
                  Commonwealth of Massachusetts. Each of Messrs. Stamps,
                  Woodsum, Avis, Mannion, Evans, Roberts, and Kortschak is a
                  United States citizen.

ITEM 2(D).        TITLE OF CLASS OF SECURITIES: Common Stock, $.001 par value
                  per share.

ITEM 2(E).        CUSIP NUMBER:  40391710


                               Page 18 of 38 Pages
<PAGE>

ITEM 3.           IF THIS STATEMENT IS FILED PURSUANT TO RULES 13D-1(B), OR
                  13D-2(B), CHECK WHETHER THE PERSON FILING IS A:
                  Not Applicable.

ITEM 4.           OWNERSHIP.

                  (a)   Amount Beneficially Owned:

                        Each of Summit Ventures IV, L.P., Summit Partners IV,
                        L.P., Summit Ventures III, L.P., Summit Partners III,
                        L.P., Summit Investors II, L.P., Stamps, Woodsum & Co.
                        IV, Stamps, Woodsum & Co. III, Summit Subordinated Debt
                        Fund, L.P. and Summit Partners SD, L.P. (individually an
                        "Entity" and collectively the "Entities") may be deemed
                        to own beneficially 2,733,940 shares of Common Stock as
                        of December 31, 1999. Each of Messrs. Stamps, Woodsum,
                        Avis, Mannion, Evans, Roberts and Kortschak may be
                        deemed to own beneficially 2,733,940 shares of Common
                        Stock as of December 31, 1999.

                        As of December 31, 1999, Summit Ventures III, L.P. was
                        the record owner of 1,258,902 shares of Common Stock. As
                        of December 31, 1999, Summit Investors II, L.P. was the
                        record owner of 47,137 shares of Common Stock. As of
                        December 31, 1999, Summit Ventures IV, L.P. was the
                        record owner of 1,258,902 shares of Common Stock. As of
                        December 31, 1999, Summit Subordinated Debt Fund, L.P.
                        was the record owner of 168,999 shares of Common Stock.
                        The shares held of record by Summit Ventures III, L.P.,
                        Summit Investors II, L.P., Summit Ventures IV, L.P. and
                        Summit Subordinated Debt Fund, L.P. are referred to
                        herein collectively as the "Record Shares." By virtue of
                        the affiliate relationships among the Entities, each
                        Entity may be deemed to own beneficially all of the
                        Record Shares. Hence, each Entity may be deemed to own
                        beneficially 2,733,940 shares of Common Stock. In their
                        capacities as individual general partners of Stamps,
                        Woodsum & Co. III, Stamps, Woodsum & Co. IV, and Summit
                        Investors II, L.P., each of Messrs. Stamps, Woodsum,
                        Avis, Mannion, Evans, Roberts and Kortschak may be
                        deemed to own beneficially 2,733,940 shares of Common
                        Stock.

                        Each of the reporting persons expressly disclaims
                        beneficial ownership of any shares of Common Stock of
                        HMT Technology Corporation, except in the case of Summit
                        Ventures IV, L.P., for the 1,258,902 shares which it
                        holds of record, in the case of Summit Subordinated Debt
                        Fund, L.P., for the 168,999 shares which it holds of
                        record, in the case of Summit Investors II, L.P., for
                        the 47,137 shares which it holds of record, and in the
                        case of Summit Ventures III, L.P., for the 1,258,902
                        shares which it holds of record.


                               Page 19 of 38 Pages
<PAGE>

                  (b)   Percent of Class:

                        Summit Ventures II, L.P.:  6.0%
                        Summit Partners IV, L.P.:  6.0%
                        Summit Ventures III, L.P.:  6.0%
                        Summit Partners III, L.P.:  6.0%
                        Summit Subordinated Debt Fund, L.P.:  6.0%
                        Summit Partners SD, L.P.:  6.0%
                        Summit Investors II, L.P.:  6.0%
                        Stamps, Woodsum & Co. III:  6.0%
                        Stamps, Woodsum & Co. IV:  6.0%
                        E. Roe Stamps, IV:  6.0%
                        Stephen G. Woodsum:  6.0%
                        Gregory M. Avis:  6.0%
                        Martin J. Mannion:  6.0%
                        Bruce R. Evans:  6.0%
                        Walter G. Kortschak:  6.0%
                        Thomas S. Roberts: 6.0%

                        The foregoing percentages are calculated based on the
                        45,794,115 shares of Common Stock reported to be
                        outstanding in a Quarterly Report on Form 10-Q for HMT
                        Technology Corporation for the quarterly period ended
                        September 30, 1999.

                  (c)   Number of shares as to which such person has:

                        (i)    sole power to vote or to direct the vote:

                               0 shares for each reporting person

                        (ii)   shared power to vote or to direct the vote:

                               Summit Ventures III, L.P.:  2,733,940 shares
                               Summit Partners III, L.P.:  2,733,940 shares
                               Summit Ventures IV, L.P.:  2,733,940 shares
                               Summit Partners IV, L.P.: 2,733,940 shares
                               Summit Subordinated Debt Fund, L.P.:
                                    2,733,940 shares
                               Summit Partners SD, L.P.: 2,733,940 shares
                               Summit Investors II, L.P.:  2,733,940 shares
                               Stamps, Woodsum & Co. III:  2,733,940 shares
                               Stamps, Woodsum & Co. IV:  2,733,940 shares
                               E. Roe Stamps, IV:  2,733,940 shares
                               Stephen G. Woodsum:  2,733,940 shares
                               Gregory M. Avis:  2,733,940 shares
                               Martin J. Mannion:  2,733,940 shares
                               Bruce R. Evans:  2,733,940 shares


                               Page 20 of 38 Pages
<PAGE>

                               Walter G. Kortschak:  2,733,940 shares
                               Thomas S. Roberts: 2,733,940 shares

                        (iii)  sole power to dispose or direct the
                               disposition of:

                               0 shares for each reporting person

                        (iv)   shared power to dispose or direct the
                               disposition of:

                               Summit Ventures III, L.P.:  2,733,940 shares
                               Summit Partners III, L.P.:  2,733,940 shares
                               Summit Ventures IV, L.P.:  2,733,940 shares
                               Summit Partners IV, L.P.: 2,733,940 shares
                               Summit Subordinated Debt Fund, L.P.:
                                    2,733,940 shares
                               Summit Partners SD, L.P.: 2,733,940 shares
                               Summit Investors II, L.P.:  2,733,940 shares
                               Stamps, Woodsum & Co. III:  2,733,940 shares
                               Stamps, Woodsum & Co. IV:  2,733,940 shares
                               E. Roe Stamps, IV:  2,733,940 shares
                               Stephen G. Woodsum:  2,733,940 shares
                               Gregory M. Avis:  2,733,940 shares
                               Martin J. Mannion:  2,733,940 shares
                               Bruce R. Evans:  2,733,940 shares
                               Walter G. Kortschak:  2,733,940 shares
                               Thomas S. Roberts:  2,733,940 shares

ITEM 5.           OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS.
                  Not Applicable.

ITEM 6.           OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER
                  PERSON.
                  Not Applicable.

ITEM 7.           IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH
                  ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING
                  COMPANY.
                  Not Applicable.

ITEM 8.           IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP.
                  Not Applicable. The reporting persons expressly disclaim
                  membership in a "group" as defined in Rule 13d-1(b)(1)(ii)(J).

ITEM 9.           NOTICE OF DISSOLUTION OF GROUP.
                  Not Applicable.


                               Page 21 of 38 Pages
<PAGE>


ITEM 10.          CERTIFICATION.
                  Not Applicable. This statement on Schedule 13G is not filed
                  pursuant to Rule 13d-1(b).



























                               Page 22 of 38 Pages
<PAGE>
                                   SIGNATURES
                                   ----------

      After reasonable inquiry and to the best of our knowledge and belief, we
certify that the information set forth in this statement is true, complete and
correct. We also hereby agree to file this statement jointly pursuant to the
Agreement listed on Exhibit 1 hereto.
                    ---------

Dated:  February 11, 2000.

SUMMIT VENTURES IV, L.P.                         SUMMIT INVESTORS II, L.P.

By:   Summit Partners IV, L.P.                   By:        *
                                                    --------------------
By:   Stamps, Woodsum & Co. IV                      General Partner


      By:        *                               SUMMIT PARTNERS IV, L.P.
         --------------------
         E. Roe Stamps, IV                       By: Stamps, Woodsum & Co. IV
         General Partner
                                                 By:        *
                                                    --------------------
SUMMIT VENTURES III, L.P.                           E. Roe Stamps, IV
                                                    General Partner
By:   Summit Partners III, L.P.

By:   Stamps, Woodsum & Co. III                  SUMMIT PARTNERS III, L.P.

                                                 By: Stamps, Woodsum & Co. III
      By:        *
         --------------------                    By:        *
         E. Roe Stamps, IV                          --------------------
         General Partner                            E. Roe Stamps, IV
                                                    General Partner

SUMMIT SUBORDINATED DEBT FUND, L.P.              SUMMIT PARTNERS SD, L.P.

By:   Summit Partners SD, L.P.                   By: Stamps, Woodsum & Co. III

By:   Stamps, Woodsum & Co. III
                                                 By:        *
                                                    --------------------
      By:        *                                  E. Roe Stamps, IV
         --------------------                       General Partner
         E. Roe Stamps, IV
         General Partner


                               Page 23 of 38 Pages
<PAGE>


STAMPS, WOODSUM & CO. IV                         STAMPS, WOODSUM & CO. III

By:        *                                     By:           *
   --------------------------                       --------------------------
   E. Roe Stamps, IV                                E. Roe Stamps, IV
   General Partner                                  General Partner


           *                                                   *
- -----------------------------                       --------------------------
E. Roe Stamps, IV                                   Martin J. Mannion


           *                                                   *
- -----------------------------                       --------------------------
Stephen G. Woodsum                                  Bruce R. Evans


           *                                                   *
- -----------------------------                       --------------------------
Gregory M. Avis                                     Walter G. Kortschak


                                                               *
                                                    --------------------------
                                                    Thomas S. Roberts



                                                    *By: /s/ Thomas F. Farb
                                                         ---------------------
                                                         Thomas F. Farb
                                                         Attorney-in-fact



- --------------------------------------------------------------------------------
*     Pursuant to Powers of Attorney on file with the Commission, which Powers
      of Attorney are incorporated herein by reference. Copies of such Powers of
      Attorney are attached hereto as Exhibit 2.
                                      ---------




                              Page 24 and 38 Pages

                                                                       EXHIBIT 1
                                                                       ---------

                                    AGREEMENT

      Pursuant to Rule 13d-1(f)(1) under the Securities Exchange Act of 1934,
the undersigned hereby agree that only one statement containing the information
required by Schedule 13G need be filed with respect to the ownership by each of
the undersigned of shares of Common Stock of HMT Technology Corporation.

      This agreement may be executed in any number of counterparts, each of
which shall be deemed an original.

      EXECUTED this 11 day of February, 2000.

SUMMIT VENTURES IV, L.P.                         SUMMIT INVESTORS II, L.P.

By:   Summit Partners IV, L.P.                   By:        *
                                                    --------------------
By:   Stamps, Woodsum & Co. IV                      General Partner


      By:        *                               SUMMIT PARTNERS IV, L.P.
         --------------------
         E. Roe Stamps, IV                       By: Stamps, Woodsum & Co. IV
         General Partner
                                                 By:        *
                                                    --------------------
SUMMIT VENTURES III, L.P.                           E. Roe Stamps, IV
                                                    General Partner
By:   Summit Partners III, L.P.

By:   Stamps, Woodsum & Co. III                  SUMMIT PARTNERS III, L.P.
+
                                                 By: Stamps, Woodsum & Co. III
      By:        *
         --------------------                    By:        *
         E. Roe Stamps, IV                          --------------------
         General Partner                            E. Roe Stamps, IV
                                                    General Partner

SUMMIT SUBORDINATED DEBT FUND, L.P.              SUMMIT PARTNERS SD, L.P.

By:   Summit Partners SD, L.P.                   By: Stamps, Woodsum & Co. III

By:   Stamps, Woodsum & Co. III
                                                 By:        *
                                                    --------------------
      By:        *                                  E. Roe Stamps, IV
         --------------------                       General Partner
         E. Roe Stamps, IV
         General Partner


                               Page 25 of 38 Pages
<PAGE>


STAMPS, WOODSUM & CO. III                                   *
                                                 -----------------------
                                                 E. Roe Stamps, IV
By:        *
   --------------------
   E. Roe Stamps, IV                                        *
   General Partner                               -----------------------
                                                 Stephen G. Woodsum


                                                            *
STAMPS, WOODSUM & CO. IV                         -----------------------
                                                 Gregory M. Avis

By:        *
   --------------------                                     *
   E. Roe Stamps, IV                             -----------------------
   General Partner                               Martin J. Mannion


                                                            *
                                                 -----------------------
                                                 Bruce R. Evans


                                                            *
                                                 -----------------------
                                                 Walter G. Kortschak


                                                            *
                                                 -----------------------
                                                 Thomas S. Roberts


                                                 *By: /s/ Thomas F. Farb
                                                      ------------------
                                                      Thomas F. Farb
                                                      Attorney-in-fact


- --------------------------------------------------------------------------------

*     Pursuant to Powers of Attorney on file with the Commission, which Powers
      of Attorney are incorporated herein by reference. Copies of such Powers of
      Attorney are attached hereto as Exhibit 2.
                                      ---------


                               Page 26 of 38 Pages

                                                                       EXHIBIT 2
                                                                       ---------

                                POWER OF ATTORNEY


      KNOW ALL MEN BY THESE PRESENTS, that each person whose signature appears
below hereby constitutes and appoints each and any of E. Roe Stamps, IV, Stephen
G. Woodsum, Gregory M. Avis, Walter G. Kortschak and Thomas F. Farb his true and
lawful attorney-in-fact and agent, with full power of substitution and
resubstitution, for him and in his name, place and stead, in any and all
capacities (until revoked in writing) to sign any and all instruments,
certificates and documents required to be executed on behalf of himself
individually or on behalf of each or any of Summit Ventures, L.P., SP (1984),
L.P. (f/k/a Summit Partners, L.P.), Stamps, Woodsum & Co., Summit Partners'
Holdings, L.P., Summit Ventures II, L.P., Summit Partners II, L.P., Stamps,
Woodsum & Co. II, SV Eurofund C.V., SV International, L.P., Summit Investors,
L.P., Summit Investors II, L.P., Summit Investors III, L.P., Summit Ventures
III, L.P., Summit Partners III, L.P., Stamps, Woodsum & Co. III, Summit Ventures
IV, L.P., Summit Partners IV, L.P., Stamps, Woodsum & Co., IV, Summit
Subordinated Debt Fund, L.P., Summit Partners SD, L.P., Summit E-Tek Holdings,
LLC, SW Management Corp., Summit Partners, L.P., Summit Master Company, LLC,
Summit Subordinated Debt Fund II, L.P., Summit Partners SD II, LLC, Summit
Ventures V, L.P., Summit Partners V, L.P., Summit Partners, LLC, Summit V
Advisors Fund, L.P., Summit V Advisors Fund (QP), L.P. and Summit V Companion
Fund, L.P., pursuant to sections 13 and 16 of the Securities Exchange Act of
1934, as amended (the "Exchange Act"), and any and all regulations promulgated
thereunder, and to file the same, with all exhibits thereto, and any other
documents in connection therewith, with the Securities and Exchange Commission,
and with any other entity when and if such is mandated by the Exchange Act or by
the By-laws of the National Association of Securities Dealers, granting unto
said attorney-in-fact and agent full power and authority to do and perform each
and every act and thing requisite and necessary fully to all intents and
purposes as she might or could do in person thereby ratifying and confirming all
that said attorney-in-fact and agent, or her substitute or substitutes, may
lawfully do or cause to be done by virtue hereof.












                               Page 27 of 38 Pages
<PAGE>

      IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th
day of February, 2000.


                                               /s/ E. Roe Stamps, IV
                                               ---------------------------
                                               E. Roe Stamps, IV


Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )


      On this 7th day of February, 2000, before me personally came E. Roe
Stamps, IV, known to me to be the person described and who executed the
foregoing instrument that he acknowledged that he executed the same.

[Notary Seal]

                                               /s/ Cynthia R. Freedman
                                               ---------------------------
                                               Notary Public


                                               My Commission expires:
                                               October 20, 2000
                                               ----------------





                               Page 28 of 38 Pages
<PAGE>


      IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th
day of February, 2000.


                                               /s/ Stephen G. Woodsum
                                               ---------------------------
                                               Stephen G. Woodsum


Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )


      On this 7th day of February, 2000, before me personally came Stephen G.
Woodsum, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                               /s/ Cynthia R. Freedman
                                               ---------------------------
                                               Notary Public


                                               My Commission expires:
                                               October 20, 2000
                                               ----------------










                               Page 29 of 38 Pages
<PAGE>


      IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th
day of February, 2000.


                                               /s/ Martin J. Mannion
                                               ---------------------------
                                               Martin J. Mannion


Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )


      On this 7th day of February, 2000, before me personally came Martin J.
Mannion, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                               /s/ Cynthia R. Freedman
                                               ---------------------------
                                               Notary Public


                                               My Commission expires:
                                               October 20, 2000
                                               ----------------











                               Page 30 of 38 Pages
<PAGE>


      IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 8th
day of February, 2000.


                                               /s/ Gregory M. Avis
                                               ---------------------------
                                               Gregory M. Avis


State of California                         )
                                            ) ss:
County of Santa Clara                       )


      On this 8th day of February, 2000, before me personally came Gregory M.
Avis, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]
                                               /s/ Cynthia R. Freedman
                                               ---------------------------
                                               Notary Public


                                               My Commission expires:
                                               October 20, 2000
                                               ---------------------------












                               Page 31 of 38 Pages
<PAGE>


      IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th
day of February, 2000.


                                               /s/ Thomas S. Roberts
                                               ---------------------------
                                               Thomas S. Roberts


Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )


      On this 7th day of February, 2000, before me personally came Thomas S.
Roberts, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.


[Notary Seal]

                                               /s/ Cynthia R. Freedman
                                               ---------------------------
                                               Notary Public


                                               My Commission expires:
                                               October 20, 2000
                                               ----------------











                               Page 32 of 38 Pages
<PAGE>


      IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th
day of February, 2000.


                                               /s/ Bruce R. Evans
                                               ---------------------------
                                               Bruce R. Evans


Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )

      On this 7th day of February, 2000, before me personally came Bruce R.
Evans, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]


                                               /s/ Cynthia R. Freedman
                                               ---------------------------
                                               Notary Public


                                               My Commission expires:
                                               October 20, 2000
                                               ----------------








                               Page 33 of 38 Pages
<PAGE>


      IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 8th
day of February, 2000.


                                               /s/ Walter G. Kortschak
                                               ---------------------------
                                               Walter G. Kortschak


State of California                         )
                                            ) ss:
County of Santa Clara                       )


      On this 8th day of February, 2000, before me personally came Walter G.
Kortschak, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                               /s/ Cynthia R. Freedman
                                               ---------------------------
                                               Notary Public


                                               My Commission expires:
                                               October 20, 2000
                                               ---------------------------








                               Page 34 of 38 Pages
<PAGE>


      IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th
day of February, 2000.


                                               /s/ Joseph F. Trustey
                                               ---------------------------
                                               Joseph F. Trustey


Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )


      On this 7th day of February, 2000, before me personally came Joseph F.
Trustey, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                               /s/ Cynthia R. Freedman
                                               ---------------------------
                                               Notary Public


                                               My Commission expires:
                                               October 20, 2000
                                               ----------------










                               Page 35 of 38 Pages

<PAGE>


      IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th
day of February, 2000.


                                               /s/ Kevin P. Mohan
                                               ---------------------------
                                               Kevin P. Mohan


Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )


      On this 7th day of February, 2000, before me personally came Kevin P.
Mohan, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]

                                               /s/ Cynthia R. Freedman
                                               ---------------------------
                                               Notary Public


                                               My Commission expires:
                                               October 20, 2000
                                               ----------------









                               Page 36 of 38 Pages
<PAGE>


      IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 8th
day of February, 2000.


                                               /s/ Peter Y. Chung
                                               ---------------------------
                                               Peter Y. Chung



Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )


      On this 8th day of February, 2000, before me personally came Peter Y.
Chung, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]
                                               /s/ Cynthia R. Freedman
                                               ---------------------------
                                               Notary Public


                                               My Commission expires:
                                               October 20, 2000
                                               ---------------------------










                               Page 37 of 38 Pages
<PAGE>


      IN WITNESS WHEREOF, this Power of Attorney has been signed as of the 7th
day of February, 2000.


                                               /s/ Thomas F. Farb
                                               ---------------------------
                                               Thomas F. Farb


Commonwealth of Massachusetts       )
                                    ) ss:
County of Suffolk                   )


      On this 7th day of February, 2000, before me personally came Thomas F.
Farb, known to me to be the person described and who executed the foregoing
instrument that he acknowledged that he executed the same.

[Notary Seal]


                                               /s/ Cynthia R. Freedman
                                               ---------------------------
                                               Notary Public


                                               My Commission expires:
                                               October 20, 2000
                                               ---------------------------










                               Page 38 of 38 Pages


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