Hitachi Z5K320, Travelstar. Hard drive capacity: 320 GB, Hard drive size: 63.5 mm (2.5 "), Hard drive rotational speed: 5400 RPM. Power consumption (standby): 0.1 W, Power consumption (read): 1.66 W, Power consumption (write): 1.66 W. Weight: 95 g, Height: 7 mm, Width: 70 mm. Operating temperature range (T-T): 0 - 60 °C, Storage temperature range (T-T): -40 - 65 °C, Operating shock: 225 G