Rosewill Hard Drive Enclosure with Cable Attachment Size: 3.5" AC Adapter: 100-240 VAC, 12V/4.2A output Internal Interface: SATA I/II External Interface: USB 2.0 Maximum Capacity (per Bay): Up to 2TB Per Bay Fan: Yes Operating Systems Supported: WinXP/Vista/Win7 ,and MAC OS 10.x and Above, and Linux2.4.1.0 or Above JBOD: It enables each hard drive to be seen separately as single drive. (Showing 2 HDD capacities)