Western Digital Scorpio Blue 320GB. Hard drive capacity: 320 GB, Hard drive size: 63.5 mm (2.5 "), Hard drive rotational speed: 5400 RPM. Power consumption (standby): 0.25 W. Weight: 0.117 kg, Height: 9.5 mm, Width: 69.85 mm. Operating temperature range (T-T): 0 - 60 °C, Storage temperature range (T-T): -40 - 65 °C, Operating relative humidity range: 8 - 95 %