Western Digital CAVIAR GP 1TB. Hard drive capacity: 1000 GB, Hard drive size: 88.9 mm (3.5 "), Hard drive rotational speed: 7200 RPM. Power consumption (standby): 0.97 W, Power consumption (PowerSave): 4 W, Power consumption (off): 0.97 W. Weight: 0.73 kg, Height: 26.1 mm, Width: 101.6 mm. Operating shock: 65 G