Promise Technology Inc developed an RAID (redundant arrays of independent disks) storage device that is connected via the "Thunderbolt" high-speed interface (maximum transmission rate: 10Gbps).
The device, "Pegasus," was exhibited at Computex Taipei 2011, which runs from May 31 to June 3, 2011, in Taipei, Taiwan. It comes in two models. One is the "Pegasus R6," which is equipped with six Serial ATA-connected HDDs, and the other is "Pegasus R4," which has four Serial ATA-connected HDDs.
Promise Technology has been providing Fibre Channel-connected storage devices for use in professional video editing, etc.
"By employing Thunderbolt, with which the MacBook Pro and iMac are compatible, we wanted to provide high-speed, easy-to-use storage devices," said Steven Lien, deputy manager, Corporate Marketing Department, Sales & Marketing Division of Promise Technology.
The Pegasus has two Thunderbolt ports. Up to six units of the Pegasus can be connected in daisy chain. Also, it is possible to transmit DisplayPort video signals (pass through transmission) to a display connected via Thunderbolt. The controller chip for Thunderbolt was obtained from Intel Corp.
According to Promise Technology, when the six-RAID Pegasus R6 and Apple Inc's "iMac" (a model with a 27-inch display and the "Core i7" processor (operating frequency: 3.4GHz)) are connected via Thunderbolt, the reading and writing speeds are both about 800MBps.
"The read/write throughput of the Pegasus connected via Thunderbolt is higher than that of a Serial ATA-connected HDD embedded in an iMac," Promise Technology said.
In the company's booth at Computex Taipei 2011, it had the following demonstration. When seven 1,080p movies were simultaneously played on an iMac and they are read out from its embedded HDD, the movies were not correctly played and became like slide shows due to slow data transmission. On the other hand, when the movies were read out from the Pegasus connected via Thunderbolt, they were correctly played without dropping frames.
Furthermore, Promise Technology developed the "SANLink," an adapter that converts Thunderbolt to Fiber Channel, for connecting the MacBook Pro or iMac to Fiber Channel-connected storage devices via Thunderbolt.