The 2TB Pegasus J4 2.5″ Thunderbolt External RAID Enclosure from Promise Technology is a disk array. The system could support optional 7200rpm HDDs or SSDs (solid state drives).
The array is equipped with two Thunderbolt 10Gb/s interfaces (cables sold separately) and delivers data transfer speeds of up to 386.82MB/s read and 385.21MB/s write. It can be set up in a variety of RAID backup configurations, including RAID 0, 1 and JBOD, giving you the flexibility to choose higher data storage capacity or greater data protection.
The system supports daisy chaining up to 6 Thunderbolt-compatible devices. It is compatible with Mac OS X 10.6.8, 10.7.4, 10.7.5, 10.8 and 10.8.2, and supports Time Machine. The enclosure is constructed from durable, lightweight aluminum.