This Dual SATA External RAID Hard Drive Enclosure offers a practical external RAID solution, allowing you to install up to two Serial ATA (SATA, SATA II, SATA III) hard drives for connection to a host computer through high speed USB (Universal Serial Bus) 2.0. Delivering easy to use, yet versatile external RAID storage, the enclosure automatically configures your RAID array based on your selection (JBOD, Striping (RAID 0), Spanning (non RAID), & Mirror (RAID 1) modes supported).