Sans Digital MobileSTOR MS2UTN+B 2 Bay SATA to eSATA/USB 2.0 RAID 0/1/SAFE33/50 Enclosure (Black) Temperature controlled cooling fan for quieter operations. Support Windows, Linux, and MAC OS X Note: For eSATA connection, port multiplier support required SAFE 33 / SAFE50 creates two hard drive volumes where 1/3 or 1/2 of the hard drive volume is used for mirroring and the rest is used for spanning (Big). GUI mode allow customized RAID mode setup. Up to 2 RAID volume with different RAID mode can be set. Hardware RAID engine, supporting RAID 0, RAID 1, Spanning, JBOD, SAFE33, and SAFE50. Drive interface: 2 x 3.5" SATA I / SATA II hard drive. Removable trays for fast access of additional hard drives and easy trouble shooting. Drive interface: 2 x 3.5" SATA / SATA2 hard drive. HDD Trays: 2x 3.5" Hot-Swappable Hard Drive Tray Maximum Capacity: 3 TB Hot-Spare: N/A Host Interface & Transfer Rate: USB 2.0 (480Mbps) & eSATA (3.0 Gbps) Drive Interface: SATA I & SATA II Power Supply: 80W (100~240V) Form Factor: Cube