HGST Travelstar 5K750 640GB, Travelstar. Hard drive capacity: 640 GB, Hard drive size: 63.5 mm (2.5 "), Hard drive rotational speed: 5400 RPM. Power consumption (standby): 0.2 W, Power consumption (read): 1.4 W, Power consumption (write): 1.4 W. Weight: 0.102 kg, Height: 9.5 mm, Width: 70 mm. Operating temperature range (T-T): 0 - 60 °C, Storage temperature range (T-T): -40 - 65 °C, Operating shock: 400 G