USB 2.0 + Firewire 1394 Combo Enclosure for 3.5-inch IDE Desktop Hard Drive Dual FireWire ports give you the opportunity to daisy chain multiple hard drives USB 2.0 port supports High speed data transfer up to 480Mpbs Large Storage Support with 2.0A Power Supply Compatible OS: Windows 98SE/2000/ME/XP/2003/Vista, Mac OS 8.6 or above, Linux Better vantilation design with a built-in Fan