Western Digital 500GB WD RE4. Hard drive capacity: 500 GB, Hard drive size: 88.9 mm (3.5 "), Hard drive rotational speed: 7200 RPM. Power consumption (standby): 0.7 W, Power consumption (read): 7.9 W, Power consumption (write): 7.9 W. Weight: 730 g, Height: 25.4 mm, Width: 101.6 mm. Operating temperature range (T-T): 0 - 60 °C, Storage temperature range (T-T): -40 - 70 °C, Operating shock: 65 G