G-RAID 0G04081 G1 USB with External Drives, 16TB, Silver 2 x 8TB 3.5" SATA III removable Enterprise-class hard drives USB 3.0 interface / USB 2.0 Compatible User configurable hardware RAID 0 (Performance) or RAID 1 (Protected and JBOD) 7200RPM Smart cooling fan for quiet operation, long life and data reliability