Hitachi G-SAVE. Total storage capacity: 1000 GB, Hard drive capacity: 500 GB, Hard drive rotational speed: 7200 RPM. Cables included: USB, FireWire. Power supply: 70 W. Weight: 4500 g. Compatible operating systems: Mac OSX 10.3/10.4/10.5/10.6/10.7 Windows Vista/XP/2000/7