EXHIBIT 99.1

FOR IMMEDIATE RELEASE

Company Contact
Todd Schaeffer
Chief Financial Officer
714-481-7808
tschaeffer@mti.com

                           MTI TECHNOLOGY CORPORATION
           SECURES $15 MILLION INVESTMENT LED BY ADVENT INTERNATIONAL

TUSTIN, CALIF., JUNE 22, 2004 - MTI Technology Corporation (Nasdaq/SCM: MTIC), a
global provider of data storage products, data management and protection
solutions, professional services and support, today announced that it has raised
$15 million, before consideration of professional fees, in a private placement
equity financing transaction led by Advent International. In connection with the
financing, MTI issued 566,797 shares of Series A Convertible Preferred Stock at
$26.46 per share and warrants to purchase 1,624,308 shares of Common Stock of
MTI with an exercise price of $3.10 per share.

"The proceeds from the Advent investment will be used to support the continued
expansion of our sales and professional services organizations," said Thomas P.
Raimondi, President and CEO of MTI. "With Advent's strategic and financial
support, we believe we are well positioned to focus on sustainable growth and
improving the financial metrics of our business. Continued development as a
provider of mid-market solutions is an important element of MTI's overall growth
plans."

As part of the investment, Michael Pehl, head of Advent International's
technology venture group has joined MTI's Board of Directors. Mr. Pehl has more
than 20 years of experience forming and managing information technology
companies, including SAP America; International Consulting Solutions, acquired
by Deloitte & Touche Consulting Group; and iCube, which completed an IPO on
Nasdaq before merging with Razorfish Inc. (Nasdaq: RAZF). Advent's venture
capital funds invest in expansion stage companies operating in technology
industries.

The securities issued in the private placement have not been registered under
the Securities Act of 1933, as amended, and may not be offered or sold in the
United States absent registration under the Securities Act and applicable state
securities laws or an applicable exemption from those registration requirements.
This press release shall not constitute an offer to sell or the solicitation of
an offer to buy any securities of MTI.

ABOUT MTI TECHNOLOGY CORPORATION

MTI's mission as a global solutions provider is to deliver superior business
value to its customers in support of their data storage and enhanced data
protection needs. MTI has more than 20 years of experience in delivering a full
range of storage solutions including: assessment,

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design, integration, professional services and third-party maintenance. MTI is a
premier systems integrator focusing on providing midrange to Global 2000
customers with end-to-end business solutions in the storage marketplace.
Headquartered in Tustin, California, MTI may be reached by telephone at
800-999-9MTI (toll free) or 714-481-7800, or by fax at 714-481-4135. Web address
is www.mti.com.

ABOUT ADVENT INTERNATIONAL

Advent International is one of the world's largest private equity firms, with $6
billion in cumulative capital raised and offices in 13 countries across North
America, Europe, Latin America and Asia Pacific. Since its founding in 1984,
Advent has been committed to helping management teams build successful
businesses by applying its industry expertise, international resources and local
market knowledge. Over 130 of Advent's portfolio companies have completed IPOs
on major stock exchanges worldwide. Its portfolio companies have raised more
than $10 billion through public equity and debt offerings. Advent International
has been investing in information technology and software companies for 18 years
and has completed over 80 investments in the sector worldwide. Investments
include RedPrairie Corp., Aspen Technology Inc. (Nasdaq: AZPN), Precise Software
Solutions Inc. (IPO on Nasdaq, subsequently acquired by Veritas Software Corp.),
PaySys International Inc. (acquired by First Data Corp.), BMC Software Inc.
(NYSE: BMC), and Lightbridge Inc. (Nasdaq: LTBG). For more information, visit
www.adventinternational.com.

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MTI is a registered trademark of MTI Technology Corporation (the "Company").

Statements in this press release concerning MTI's business outlook or future
economic performance, anticipated profitability, revenues, expenses or other
financial items, expansion efforts and business growth together with other
statements that are historical facts, are "forward-looking statements" as that
term is defined under Federal Securities Laws. "Forward-looking statements" are
subject to risks, uncertainties and other factors which could cause actual
results to differ materially from those stated in such statements. Such risks,
uncertainties and factors include, but are not limited to, the use of funds as
anticipated, the expected growth of our industry and business, the profitability
of our business model, our need for additional capital and other risks detailed
in the Company's filings with the Securities and Exchange Commission including
the Company's annual report on Form 10-K filed on July 11, 2003. MTI disclaims
any obligations to update any forward-looking statement as a result of events
occurring after the date of this press release.

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