TowerRAID TR4M+B - 4 Bay eSATA RAID 0/1/10/5/JBOD Performance Tower w/ 6G PCIe Card (Black) Drive:SATA 150 & 300 External I/O:eSATA (via Port Multiplier)RAID Levels RAID Levels:RAID 0, 1, 10, 5, 5+spare, Spanning and JBOD (via Bundled RR622 RAID Controller Card) 3.5-Inch Drive Bays:4 x Hot-Swappable OS Supported:Supports PC, Linux and MAC OS, including Windows 7, Windows Server 2008 and Snow Leopard Power Supply:150W (115V - 230V Switchable) Maximum Capacity: 12TB Cooling Fan: 3.15-Inch Ball Bearing Fan