Drobo Pro Beyond Raid 8-Bay USB 2.0/FireWire 800/iCSI/SATA 6GB/S Storage Array  DRPR1A21 Up to 8 disks of instant expansion Single or dual disk redundancy Triple Interface - iSCSI (Gigabit Ethernet), FireWire 800 (400 compatible) and Hi-Speed USB 2.0 Up to 16 x 16TB Smart Volumes BeyondRAID technology