EXHIBIT 99.1

FOR IMMEDIATE RELEASE

EDITOR'S CONTACT:
Frank Berry
QLogic Corporation
Phone: (949) 389-6499
frank.berry@qlogic.com

INVESTOR'S CONTACT:
Michael Roe
QLogic Corporation
Phone: (949) 389-6440
michael.roe@qlogic.com

               QLOGIC REPORTS PRELIMINARY FOURTH QUARTER EARNINGS
               PER SHARE FOR FISCAL 2004 IN LINE WITH PROJECTIONS;
                           REVENUE LOWER THAN EXPECTED

Aliso Viejo, Calif., March 30, 2004 - QLogic Corporation (Nasdaq:QLGC) announced
today it expects non-GAAP earnings per share for its fiscal fourth quarter ended
March 28, 2004 to be approximately $0.36 per share on a diluted basis, which is
at the low end of the range previously projected during the Company's third
quarter conference call on January 14th. This projected earnings per share
amount differs from projected diluted earnings per share of approximately $0.34
on a GAAP basis, due to the effect of approximately $0.02 per share related to
non-cash merger related stock compensation charges. The Company expects to
report revenue for the fourth quarter of approximately $128 million, compared to
the range of $138-$141 million previously projected in January 2004.

"Although we entered the fourth quarter expecting to continue the momentum
generated by our revenue growth throughout the first three quarters of fiscal
2004, we experienced weaker than expected demand during the end of our fourth
quarter. A majority of our revenue shortfall is related to a decline in expected
orders from two original equipment manufacturer customers for host bus adapters
at the end of the quarter. Despite the challenges encountered with our fourth
quarter revenues, we expect that our overall gross margin percentage will be
comparable to the prior quarter," said H.K. Desai, the Company's chairman, chief
executive officer and president. "We continue to be confident about our future
growth potential and the overall long-term health of our business."

QLogic will announce its final fourth quarter and year end financial and
operating results on April 28, 2004. In addition, the Company will provide
additional information and commentary during its regular

quarterly conference call scheduled for April 28, 2004 at 2:30 p.m. Pacific Time
(5:30 p.m. Eastern Time). H.K. Desai, chairman, chief executive officer and
president, and Frank Calderoni, senior vice president and chief financial
officer, will conduct the call, which will be webcast live via the Internet at
www.qlogic.com or via CCBN. Phone access is available at (913) 981-4901,
passcode: 750734.

A replay of the conference call will be available via webcast at www.qlogic.com
for twelve months. An audio replay will also be available through May 12, 2004
at (719) 457-0820, passcode: 750734.

NON-GAAP FINANCIAL MEASUREMENTS

The non-GAAP diluted earnings per share amount supplements the corresponding
financial measurement computed in accordance with generally accepted accounting
principles (GAAP) and excludes non-cash merger related stock compensation
charges. The Company has provided this non-GAAP financial measure to assist
investors to better understand the Company's core operating performance and to
enhance comparisons of its core operating performance with historical periods
and the operating performance of its competitors. Items excluded from non-GAAP
financial measurements are also excluded by management in its evaluation of the
core operating performance of the Company and in its evaluation of trends
between fiscal periods. In addition, the Company prepares and maintains all
budgets and forecasts of future periods on a basis consistent with this non-GAAP
financial measurement. Investors should consider non-GAAP measures in addition
to, and not as a substitute for, or as superior to, measures of financial
performance prepared in accordance with GAAP.

DISCLAIMER - FORWARD LOOKING STATEMENTS

This press release contains statements relating to future results of the Company
(including certain beliefs and projections regarding business trends) that are
"forward-looking statements" as defined within the Private Securities Litigation
Reform Act of 1995. Such forward-looking statements are subject to risks and
uncertainties that could cause actual results to differ materially from those
projected or implied in the forward-looking statements. The Company wishes to
advise readers that these potential risks and uncertainties include, but are not
limited to: the volatility of the Company's stock price; fluctuations in
operating results; the dependence on the storage area network market; the
ability to maintain and gain market or industry acceptance of the Company's
products; the dependence on a limited number of customers and fluctuations or
cancellations in orders from customers; the ability to compete effectively with
other companies; a reduction in sales efforts by current distributors; the
dependence on relationships with certain silicon chip suppliers and other
subcontractors; the complexity of the Company's products; terrorist activities
and resulting military actions; international, economic, regulatory, political
and other risks; changes in semiconductor foundry capacity; the ability to
maintain or expand upon strategic alliances; the strain on resources caused by
rapid growth and expansion; the ability to attract and retain key personnel; and
the ability to protect proprietary rights or to satisfactorily resolve any
infringement claims.

More detailed information on these and additional factors which could affect the
Company's operating and financial results are described in the Company's Forms
10-K, 10-Q and other reports, filed or to be filed with the Securities and
Exchange Commission. The Company urges all interested parties to read these
reports to gain a better understanding of the many business and other risks that
the Company faces. The forward looking statements contained in this press
release are made only as of the date hereof, and the Company undertakes no
obligation to update or revise these forward-looking statements, whether as a
result of new information, future events or otherwise.

Trademarks and registered trademarks are the property of the companies with
which they are associated.