Western Digital Caviar SE 40 GB EIDE. Hard drive capacity: 40 GB, Hard drive size: 88.9 mm (3.5 "), Hard drive rotational speed: 7200 RPM. Power consumption (standby): 1 W. Weight: 600 g. Operating temperature range (T-T): 5 - 55 °C, Storage temperature range (T-T): -40 - 65 °C, Operating relative humidity range: 5 - 95 %