250GB External FW800/400 Specifications - Disk Drives - 7200 RPM/8MB cache Interface - (2) FireWire 800 / (1) FireWire 400 Unit Size (LxWxH) - 9.25 x 5.125 x 1.82 inches (235 x 130 x 46 mm) Weight - 2.6 lbs (1.18 kg) System Requirements - FireWire 800 / USB 2.0 Operation - Mac OS X 10.3.x or higher,Windows 2000/XP - FireWire 400 Operation - Mac OS 9.2 or higher, Windows 2000/XP