Rosewill Full Aluminum Cover Metal Tray 3.5-Inch USB 3.0 External Enclosure - Silver (RX-358-U3S) Size: 3.5" Internal Interface: SATA I/II External Interface: USB 3.0 Maximum Capacity (per Bay): Up to 3TB (WinXP Not supported 3TB) Fan: 1 x 80mm cooling fan (Internal Tray) Transfer rates up to 4.8 Gbps with USB 3.0 Compliant with USB 3.0 Backward Compatible With USB 2.0 & 1.1 Power On/Off for internal cooling fan