Buffalo DriveStation Combo TurboUSB 750 GB USB 2.0/ IEEE1394 . Total storage capacity: 750 GB, Hard drive capacity: 750 GB, Hard drive rotational speed: 7200 RPM. Power requirements: AC100-240V 50/60 Hz, Power consumption (typical): 25 W. Weight: 1270 g. Operating temperature range (T-T): 5 - 35 °C. Compatible operating systems: WindowsVista, WindowsXP Windows2000 Mac OSX