Dot Hill Secures Six New Patents

CARLSBAD, Calif. - June 24, 2009 - Dot Hill Systems Corp. (Nasdaq: HILL), a world-class provider of entry-level and midrange storage solutions for OEMs and system integrators (SIs), today demonstrated its continued focus on technology innovation, with the announcement of six new patents granted by the United States Patent and Trademark Office.

Developed by Dot Hill's Longmont, Colo. engineering team, these latest innovations are part of the company's growing patent portfolio. Dot Hill has been awarded 48 patents to date.  Dot Hill's dedication to technology helps give its growing list of OEMs a competitive edge in delivering innovative high performance storage solutions.

The newest patents granted to Dot Hill include:
???    U.S. patent 7,536,495 "Certified memory-to-memory data transfer between active-active RAID controllers" -- This patent provides for improved communication efficiency and reliability between redundant RAID controllers.  By using a robust, efficient protocol for transferring data and controlling information, this innovation eliminates delays in write-cache synchronization and preserves CPU processing bandwidth for other tasks.

???    U.S. Patent 7,536,506 "RAID controller using capacitor energy source to flush volatile cache data to non-volatile memory during main power outage" -- This invention provides a super capacitor energy source for RAID controllers. The super capacitor stores sufficient energy to guarantee that volatile write-data is safely transferred to non-volatile memory in the event that the main power is lost. Once the data is stored in the non-volatile memory, the RAID controller may remain unpowered indefinitely without losing any data. Super capacitor technology has significant advantages over older battery technologies, such as improved energy density, faster charge time, and significantly longer shelf life.
???    U.S. Patent 7,536,508 "System and method for sharing SATA drives in an active-active RAID controller system" -- This innovation provides a method for efficiently sharing Serial ATA (SATA) drives in an active-active RAID system including one or more Serial Attached SCSI (SAS) expanders and a communications link between the first and second RAID controllers. An ownership protocol between redundant RAID controllers communicates ownership status and changes for each SATA drive in the RAID system. In the event of a failure by a redundant RAID controller, ownership is seamlessly transferred to another RAID controller.

???    U.S. Patent 7,536,584 "Fault-isolating SAS Expander" -- This invention provides an intelligent Serial Attached SCSI (SAS) expander that automatically detects faulty communications on one of its links and isolates the fault by disabling a physical interface within the SAS expander. Upon reporting the disablement, the intelligent SAS expander recovers by taking corrective action and re-enabling the physical interface.???    U.S. Patent 7,543,096 "Safe message transfers on PCI-Express link from RAID controller to receiver-programmable window of partner RAID controller CPU memory" - This patent provides for reliable intercommunication between redundant RAID controllers in a high-availability storage system to ensure the correct user-data is written to the disk drives. A RAID controller defines a window in the memory of a redundant RAID controller for writing information, and if any write-addresses are outside the specified window, the receiving controller will not write the data. This can prevent inadvertent data corruption in RAID controller memory by not allowing received data to overwrite unrelated data that needs to be preserved.

???    7,539,799 "Method and apparatus for identifying enclosures and devices" --This invention provides automatic assignment of unique IDs to enclosures that can be used to identify and determine the exact location of the enclosure in the data storage system.

"Our Longmont, Colo., team continues to expand its patent portfolio with technology innovations that we believe translate to a competitive advantage for our OEMs and other customers," said Jim Kuenzel, senior vice president of Engineering for Dot Hill. "We continue to seek smart solutions to keep pace with the ever-changing landscape of storage challenges faced by OEMs, resellers and IT professionals."   

Dot Hill R/Evolution Storage Architecture Gives OEMs a Competitive Advantage
The highly modular, highly dynamic Dot Hill R/Evolution Architecture is designed to rapidly evolve and support OEM technology, enabling OEMs to quickly achieve sustainable competitive advantage in the volume storage market. The R/Evolution Architecture delivers the high levels of performance, storage density, time-to-market leadership and -- most importantly -- configuration flexibility required by volume storage customers. Using modular and bladed components, the R/Evolution Architecture provides OEMs with a "configure-to-product" model (not just "configure-to-order") that lets them customize volume storage market solutions quickly, easily and precisely. This unique model revolutionizes how OEMs bring storage products to market by ensuring opportunities for product differentiation, even between different companies that simultaneously OEM products from Dot Hill.
About Dot Hill
Delivering innovative technology and global support, Dot Hill empowers the OEM community to bring unique storage solutions to market, quickly, easily and cost-effectively. Offering high performance and industry-leading uptime, Dot Hill's RAID technology is the foundation for best-in-class storage solutions offering enterprise-class security, availability and data protection. The company's products are in use today by the world's leading service and equipment providers, common carriers, advanced technology and telecommunications companies as well as government agencies. Dot Hill solutions are certified to meet rigorous industry standards and military specifications, as well as RoHS and WEEE international environmental standards. Headquartered in Carlsbad, Calif., Dot Hill has offices and/or representatives in China, Germany, Japan, United Kingdom and the United States.

For more information, visit us at http://www.dothill.com/.HILL-G
Certain statements contained in this press release regarding matters that are not historical fact are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act. Because such statements are subject to risks and uncertainties, actual results may differ materially from those expressed or implied by such statements. Forward-looking statements include the availability and performance of current or future Dot Hill product features based on the patented technology described in this press release, any competitive advantage that the patent technology provides to Dot Hill, any positive effect on Dot Hill's financial results due to the issuance of a Dot Hill patent, and Dot Hill's ability to continue to receive patent protection on current or future technology. The risks that contribute to the uncertain nature of the forward-looking statements include: any unforeseen technological, intellectual property, supply or engineering issues, and changing customer preferences. However, there are many other risks not listed here that may affect the future business of Dot Hill, as well as the forward-looking statements contained herein. To learn about such risks and uncertainties, you should read the risk factors set forth in Dot Hill's public filings with the SEC, including the Forms 8-K, 10-K and 10-Q most recently filed by Dot Hill. All forward-looking statements contained in this press release speak only as the date on which they were made. Dot Hill undertakes no obligation to update such statements to reflect later events or circumstances.