Press Release

MYLEX SELECTS QLOGIC FIBRE CHANNEL ISP2200 AND ULTRA160 SCSI ISP12160 FOR NEXT-GENERATION RAID PRODUCTS

ISP2200 and ISP12160 enable high-performance RAID for SANs

COSTA MESA, Calif., June 28, 1999 -QLogic Corp. (NASDAQ:QLGC), an industry leading designer of advanced, high-performance I/O controllers for direct connect and storage network interfaces, announced today that the QLogic Fibre Channel ISP2200 and Ultra160 SCSI ISP12160 interface controllers have been designed into Mylex's next-generation external and PCI RAID Products.

Mylex Corp. (NASDAQ:MYLX), the world's leading RAID controller vendor in the non-captive network systems marketplace, recently announced its roadmap for supporting the next-generation Ultra160 SCSI interface featuring enhanced performance, system interoperability and reliability. During the second half of 1999 and into 2000, Mylex plans to announce several enhancements to its DAC-series of external RAID and eXtremeRAIDÔ PCI RAID controllers to support Fibre Channel switched-network and Ultra160 SCSI storage. Mylex is the only vendor shipping a complete line of internal PCI RAID controllers for workstations and servers, and external Fibre Channel RAID controllers designed for storage area network (SAN) environments. Mylex has been shipping Fibre Channel RAID controllers based on the QLogic Fibre Channel ISP2100 for over a year and is defining the industry frontier with its new DACFF end-to-end fibre external RAID controller.

The QLogic ISP2200 Fibre Channel and ISP12160 Ultra160 SCSI chips are an integral part of Mylex's next-generation RAID architecture. The ISP2200 Fibre Channel chip provides leading-edge SAN Smart features such as an enhanced embedded RISC processor for the highest I/O efficiency, full-fabric support for switched networks, full duplex communication and support for simultaneous SCSI and IP protocols. The ISP12160 provides the latest in Ultra160 SCSI technology, with transfer rates up to 160 Mbytes/sec, cyclic redundancy-check (CRC) and domain validation. Both chips feature a 64-bit PCI bus interface and compatible firmware for easy integration and support.

"We value our OEM partnership with QLogic," stated Eric Herzog, vice president of marketing for Mylex. "Mylex is committed to the continuous development of innovative RAID products for our system and storage OEM customers. We can count on QLogic to provide leading-edge Fibre Channel technology for our high-performance RAID products deployed in demanding storage area network environments and a migration path from Ultra2 to Ultra160 SCSI products."

"QLogic is pleased that Mylex selected QLogic to deliver the critical components necessary to develop their next generation of RAID controllers," stated Larry Fortmuller, vice president and general manager of QLogic's Computer Systems Group. "Mylex's proven track record of bringing to market high-performance RAID controllers powered by QLogic's advanced ISP architecture will significantly expand the overall market for Ultra160 SCSI-based storage subsystems and Fibre Channel-enabled storage networks."

Based on QLogic's award-winning ISP architecture, the ISP2200 and ISP12160 apply advances in I/O technology to a solid, industry-proven design. As with all QLogic solutions, a great deal of care goes into ensuring effortless migration to new technology. The ISP2200 and ISP12160 are pin compatible and host software compatible with its predecessors, the ISP2100 and ISP1280. In addition, the ISP2200 and ISP12160 are designed to provide the most efficient I/O operation of any Fibre Channel and SCSI controllers available in the industry today, allowing systems OEMs to apply more processing power towards achieving superior application performance.

QLogic offers the widest array of Fibre Channel and SCSI interface products in the marketplace today. QLogic I/O controllers can be found in products from industry leading manufacturers of hard disk drives, tape drives, RAID controllers, tape libraries to UNIX and NT systems and workstations.

About Mylex
Founded in 1983, Mylex Corporation is an ISO 9001-certified developer of high-performance hardware and software for moving, storing, protecting and managing data in network and desktop environments. Ranked as the #1 supplier of RAID controllers in the non-captive network systems disk array market in the 1998 Dataquest and IDC reports, and #1 in the 1998, 1997, 1996 and 1995 DISK/TREND reports, Mylex produces high-performance RAID controller subsystems, SCSI adapters and complementary computer products for network servers, mass storage systems, workstations and system motherboards. Mylex products are sold globally through a network of OEMs, major distributors, VARs and system integrators. Mylex offers its resellers, VARs and systems integrators membership in the Mylex Reseller Services Program, a real-time support system that includes information to help propose, sell, install and support Mylex products. The program includes a special reseller-only website, located at https://reseller.mylex.com. Mylex Corporation is headquartered at 34551 Ardenwood Blvd., Fremont, CA 94555, and can be reached by phone at 510-796-6100 or toll-free at 800-77-MYLEX, by fax at 510-745-8016 or on the Internet at https://www.mylex.com.

About QLogic
QLogic Corporation is a leading designer and supplier of semiconductor and board-level I/O and enclosure management products. The company's products provide high-performance interface connections for computer systems and their attached data storage peripherals, such as hard disk and tape drives, CD-ROM drives and RAID subsystems. In addition, QLogic provides enclosure management products that monitor and communicate management information related to components that are critical to computer system and storage subsystem reliability and availability. QLogic's highly integrated, fully featured solutions are targeted at the computer system, storage device and storage subsystem marketplaces.

The company is utilizing its expertise to develop products for emerging standards such as Fibre Channel and Ultra3, as well as, SAF-TE, SES, and IPMI enclosure management solutions.

For more information about QLogic and its product lines, contact QLogic Corp., 3545 Harbor Blvd., Costa Mesa, CA 92626; telephone: 800/662-4471 (sales); 714/438-2200 (corporate); fax: 714/668-5008; home page https://www.qlc.com.

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With the exception of historical information, the statements set forth above include forward-looking statements that involve risks and uncertainties. The Company wishes to advise readers that a number of important factors could cause actual results to differ materially from those in the forward-looking statements. Those factors include new and changing technologies and customer acceptance of those technologies; a change in semiconductor foundry capacity or conditions; fluctuations in the growth of I/O markets; fluctuations or cancellations in orders from OEM customers; the Company's ability to compete effectively with other companies; cancellation of OEM products associated with design wins; and reductions in the need for space and increased costs of operations due to facility relocation. Carrying additional expansion space may increase costs and adversely impact future earnings.

These and other factors which could cause actual results to differ materially are also discussed in the company's filings with the Securities and Exchange Commission, including its recent filings on Form S-3, Form 10-K, and Form 10-Q.

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