Icy Dock MB662USEB-2S-1 DAS Hard Drive Array Number of Hard Drives Supported - 2 (0 installed) Support 3TB in each slot for all 4 RAID modes for up to 6TB of storage. Front LED indicator light to monitor disk function in case of failure in RAID 1 (SAFE). Supports up to 2 x 3.5 SATA I / II / III hard drives for maximum storage - drives are not included Plug & Play USB 2.0 (480 Mbps) + eSATA (3 Gbps) + FireWire 800 (800 Mbps) interfaces with OXFORD946 chipset.