Document:

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                                                                   EXHIBIT 10.56

                                 PROMISSORY NOTE

$7,000,000                                                         June 27, 2002
                                                             ANAHEIM, CALIFORNIA

        FOR VALUE RECEIVED, MTI TECHNOLOGY CORPORATION, a Delaware corporation
("COMPANY"), hereby promises to pay to the order of THE CANOPY GROUP, INC.
("LENDER") the principal sum of Seven Million and no/100 Dollars
($7,000,000.00), or such other greater or lesser amount as may be outstanding,
together with accrued interest thereon as provided below, on or before the
Maturity Date (as that term is defined in Section 1 below) at the offices of
Lender, or at such other address as Lender may specify in writing. This Note is
issued in connection with that certain Loan Agreement by and between Company and
Lender dated as of an even date herewith (the "Loan Agreement")

        1.     "Maturity Date" shall mean June 30, 2003 for all advances on this
               Note.

        2.     Interest shall accrue on the unpaid principal amount of this Note
               at the rate of nine percent (9%) per annum, computed on the basis
               of the actual number of days elapsed and a year of 365 days and
               shall be payable to Lender within three days of the end of each
               calendar quarter; provided, however, that in the event of an
               Event of Default pursuant to Section 8, below, interest shall
               accrue at a rate of twelve percent (12%) per annum or, if such
               rate is prohibited by applicable law, the highest interest rate
               permitted by applicable law.

        3.     Company's obligations under this Note are secured by the
               collateral described in that certain Security Agreement between
               Company and Lender dated as of the date hereof (the "Security
               Agreement" and, together with this Note and the Loan Agreement
               the "Loan Documents"). A UCC Financing Statement will be filed to
               perfect the security interest granted therein.

        4.     Company may prepay this Note at any time, in whole or in part.
               Acceptance by Lender of any partial payment shall not be deemed
               to constitute a waiver by Lender to require prompt payment of the
               Note on the Maturity Date, or as otherwise provided herein. Any
               partial payment will be applied (a) first, to the payment of
               accrued interest, and (b) second, to the extent that the amount
               of such prepayment exceeds the amount of all such accrued
               interest, to the payment of principal.

        5.     This Note evidences a revolving line of credit. Advances on the
               revolving line of credit may be requested by the authorized
               agents as provided in the Loan Agreement. Lender may, but need
               not, require that all oral requests be confirmed in writing. Upon
               the Company's request for an advance pursuant to the conditions
               set forth in the Loan Agreement, Lender shall deliver such
               requested amount to

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               Borrower. The Company agrees to be liable for all sums advanced
               in accordance with the instructions of its officers or authorized
               persons. The unpaid principal balance owing on this Note at any
               time may be evidenced by Lender's records for the Loans,
               endorsements on this Note, or by a Schedule attached to this
               Note. Notwithstanding anything to contrary contained in this
               Note, in no event shall Lender be obligated to advance and have
               outstanding at any one time more than a total amount of principal
               exceeding $7,000,000. Notwithstanding anything to the contrary
               contained in this Note or the Loan Agreement, Lender has no
               obligation to make advances under this Note if the Company is in
               default under any of the Loan Documents.

        6.     In the event of any action to enforce payment of this Note, in
               addition to all other relief, the prevailing party in such action
               shall be entitled to reasonable attorneys' fees and expenses.

        7.     Company hereby waives presentment, protest and demand, notice of
               protest, demand, nonpayment or dishonor.

        8.     The occurrence of any of the following conditions shall
               constitute an event of default ("Event of Default") under this
               Note:

                      a. Default in Payment. If Company fails to make any
               payment due and payable within ten (10) days of the due date
               under the terms of the Loan Documents.

                      b. Loan Documents. If Company shall be in material default
               as provided in the Loan Agreement.

                      c. Bankruptcy. If a petition in bankruptcy is filed
               against Company, and such petition is not dismissed within sixty
               (60) days of filing, a petition in bankruptcy is filed by Company
               or a receiver, trustee or custodian of any part of the Collateral
               is appointed; or if Company files a petition for reorganization
               under any of the provisions of the Bankruptcy Act or any law,
               State or Federal, or makes an assignment for the benefit of
               creditors or is adjudged insolvent by any State or Federal Court
               of competent jurisdiction.

               In the event of an Event of Default under this Section 8, Lender
               shall, in addition to any other remedies allowed by law, by
               written notice to Company, be entitled to accelerate all unpaid
               principal and interest under this Note and to exercise all
               remedies provided in the Loan Agreement and/or available at law
               and in equity. Waiver of any Event of Default will not constitute
               a waiver of any other or subsequent Event of Default.

        9.     This Note is to be governed by and construed in accordance with
               the laws of the State of Utah.

        10.    As of the date of this Note, Company hereby represents and
               warrants to Lender that Company is a corporation duly organized,
               validly existing and in good

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               standing under the laws of the State of Delaware and has all
               requisite corporate power and authority to carry on its business
               and to issue this Note and the Security Agreement.

        11.    Company shall pay to Lender the reasonably attorneys' fees and
               costs incurred by Lender in connection to the issuance of this
               Note and the Security Agreement and the advancement of funds
               hereunder.

        IN WITNESS WHEREOF, this Note is hereby executed as of the date first
set forth above:

                                        MTI TECHNOLOGY CORPORATION

                                        By: /s/ Mark A. Franzen
                                            ---------------------------------
                                        Name: Mark A. Franzen
                                              -------------------------------
                                        Title: Chief Financial Officer
                                               ------------------------------

                                       3<PAGE>
                                                                   EXHIBIT 10.57

                           [SILICON VALLEY BANK LOGO]

As of June 25, 2002

MTI Technology Corporation
4905 E. La Palma Avenue
Anaheim, CA 92807

Gentlemen:

     Reference is made to that certain Loan and Security Agreement, dated as of
October 29, 2001 (as amended, restated, supplemented, or otherwise modified from
time to time, the "Loan Agreement"), between MTI Technology Corporation
("Borrower") and Silicon Valley Bank ("Silicon"). Capitalized terms used but not
defined in this letter agreement shall have the meanings set forth in the Loan
Agreement.

          This letter agreement confirms that, subject to the following
provisions:

          (A) Borrower and Silicon have agreed to terminate the Loan Agreement
as of the date of this letter agreement;

          (B) Silicon has agreed to waive the termination fee set forth in
Section 6.2 of the Loan Agreement in connection with such termination; and

          (C) all Obligations have been paid or satisfied or cash-secured in
full;

provided, however; that: (1) all Obligations in respect of the Warrant and
related registration rights agreement shall remain in full force and effect and
survive such termination; (2) all Obligations to indemnify Silicon under the
Loan Agreement or any other related document and to reimburse Silicon for any
remaining costs and expenses shall remain in full force and effect and so
survive such termination; (3) Sections 9.15, 9.17, and 9.18 of the Loan
Agreement, and all other provisions of the Loan Agreement or any related
document that by their express terms survive any termination, shall remain in
full force and effect and so survive such termination; (4) to the extent that
any payments or proceeds (or any portion thereof) received by Silicon shall be
subsequently invalidated, declared to be fraudulent or a fraudulent conveyance
or preferential, set aside or required to be repaid to a trustee, receiver,
debtor-in-possession or any other party under any bankruptcy law, state or
federal law, common law or equitable cause, then to the extent that the payment
or proceeds is rescinded or must otherwise be restored by Silicon, whether as a
result of any proceedings in bankruptcy or reorganization or otherwise, the
Obligations or part thereof under or in respect of the Loan Agreement or related
document which were intended to be satisfied shall be revived and continue to be
in full force and effect, as if the payment or proceeds had never been received
by Silicon, and this letter agreement shall in no way impair the claims of
Silicon with respect to the revived Obligations under or in respect of the Loan
Agreement or related document; and (5) Borrower hereby pledges to Silicon the
cash or cash equivalents delivered from time to time to Silicon as security in
respect of Borrower's outstanding Letters of Credit, Foreign Exchange Contracts,
and Cash Management Services (the "Ancillary Cash Security").

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        Borrower hereby confirms that the commitment of Silicon to extend credit
under the Loan Agreement and related loan documents is terminated as of the date
of this letter agreement, and, as of the date of this letter agreement, Silicon
has no further obligation to extend credit to or for the account of Borrower.

        Silicon agrees to release, without any recourse, representation, or
warranty and on and with effect from the date of this letter agreement, all of
its security interests and liens created under the Loan Agreement and related
documents as security for the Obligations under or in respect of the Loan
Agreement (other than the Ancillary Cash Security). In connection therewith,
Silicon hereby authorizes Borrower to file in the appropriate filing office(s)
such UCC termination statements as may be necessary to terminate, as of record,
the UCC financing statements previously filed by Silicon with respect to
Borrower. Silicon further agrees, as promptly as practicable and at Borrower's
sole expense, to execute and deliver any and all other lien releases and other
similar discharge or release documents (and if applicable, in recordable form)
that (i) Borrower reasonably may request to release, as of record and without
any recourse, representation, or warranty, the security interests and all other
notices of security interests and liens previously filed by Silicon with respect
to the Obligations (other than the Ancillary Cash Security), and (ii) at
Silicon's election, Borrower prepares.

        Silicon makes no representation or warranty under or in connection with
this letter agreement, including without limitation with respect to the state of
title to any collateral securing the Obligations.

[remainder of page intentionally left blank; signature page follows]

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This letter agreement may be executed by each party on a separate counterpart,
each of which when so executed and delivered shall be an original, but all of
which together shall constitute one agreement. Delivery of an executed
counterpart of this letter agreement by telefacsimile shall be equally as
effective as delivery of an original executed counterpart of this letter
agreement.

                                        Sincerely yours,

                                        SILICON VALLEY BANK

                                        By /s/ [SIGNATURE ILLEGIBLE]
                                           ----------------------------------
                                        Title Sr. Vice President
                                              -------------------------------

Accepted and agreed:

MTI TECHNOLOGY CORPORATION

By /s/ MARK A. FRANZEN
   ---------------------------------
Title Chief Financial Officer
      ------------------------------

Acknowledged:

MTI TECHNOLOGY B.V.,
a company organized under the laws of The Netherlands

By /s/ THOMAS P. RAIMONDI, JR.
   ---------------------------------
Title Vice Chairman, President & CEO
      ------------------------------

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