Buffalo DriveStation Quattro TurboUSB 4.0TB. Total storage capacity: 4000 GB, Hard drive capacity: 1000 GB, Hard drive rotational speed: 7200 RPM. Power requirements: AC 100 50/60 Hz, Power consumption (typical): 86 W. Weight: 5.9 kg. Operating temperature range (T-T): 0 - 35 °C. Compatible operating systems: Windows Vista, XP, 2000