Sans Digital TR4UTBPN - 4 Bay USB 3.0 / eSATA Hardware RAID 5 Tower (black) Hardware RAID, supporting RAID 0, 1, 10, 3, 5, JBOD, Clone and hot spare Disk. Over 200MB/s read and 170MB/s write performance. eSATA and USB 3.0 interface. Backward compatible with USB 2.0. True hardware RAID design withinthe enclosure, No driver and No additional RAID controller needed.