FOR IMMEDIATE RELEASE

QLogic Switches, HBAs and Software Support Mac OS X

For the First Time, Customers Can Deploy a Single SAN Infrastructure to
Provision Apple Xserve RAID to Servers Running a Variety of Operating
Systems

ALISO VIEJO, Calif., -- August 4, 2005 -- QLogic Corp. (Nasdaq:QLGC), the
leader in Fibre Channel host bus adapters (HBAs), stackable switches and
blade server switches, today announced that QLogic SANblade Fibre Channel
HBAs, SANbox switches, and SANsurfer software now support Mac OS X and the
Xsan file system. Now for the first time, administrators with Xserve G5
servers and Xserve RAID systems can deploy a single SAN infrastructure to
provision their storage to rack, tower or blade servers running a variety
of popular operating systems including Mac OS, Windows, NetWare, Linux and
Solaris. And for the large base of customers standardized on QLogic HBAs,
Apple servers now can be seamlessly integrated to their SANs using the
corporate standard HBA.

"I really needed the price/performance of Apple Xserve RAID for my G5
servers," said Ramy Katrib, CEO of DigitalFilm Tree. "With support for
multiple operating systems, and the diverse post environment we manage,
QLogic is helping me extend that price/performance to my Linux and Windows
servers."

A Single SAN Infrastructure for Apple Xserve, Xserve RAID and Xsan

SANblade HBAs -- 100 Percent More Reliable, Five-Year warranty SANblade
HBAs are now available for servers running Mac OS X. The most popular
QLogic HBAs have a field-proven mean-time-between-failure of 1.7 million
hours -- 100 percent greater than the primary competitor. Reliable SANblade
HBAs are backed by a warranty of up to five years -- the best in the
industry. That's why according to Dell'Oro, Gartner and IDC, QLogic ranked
number one in market share for Fibre Channel HBA ports shipped and Fibre
Channel HBA revenue in 2004.

SANsurfer Software -- Install an Entire SAN in minutes SANsurfer HBA device
drivers, HBA management software and switch management software are now
available for Mac OS X. QLogic SANsurfer software has the unique capability
to manage HBAs, switches and disk arrays from a single console.

SANbox Switches -- The Leader in FC Blade Server and Stackable Switches The
complete line of SANbox Fibre Channel switches is now available for Mac OS
X. Recent winner of Storage Magazine Product of the Year, the SANbox 5200
is the market share leader for Fibre Channel stackable switches. And
according to IDC, QLogic was the market share leader for Fibre Channel
blade server switches in 2004.

About QLogic
QLogic is the leading supplier of Fibre Channel host bus adapters (HBAs),
Fibre Channel blade server switches, Fibre Channel stackable switches, tape
controllers and hard disk controllers. The Company is also a leading
supplier of iSCSI HBAs. QLogic products are delivered to small, medium and
large enterprises around the world, powering solutions from leading
companies like Cisco, Dell, EMC, Fujitsu, Hitachi, HP, IBM, NEC, Network
Appliance, Quantum, StorageTek and Sun Microsystems. QLogic is a member of
the S&P 500 Index and NASDAQ 100 Index. For more information, visit
(http://www.qlogic.com/).