Western Digital WD Caviar SE16 320GB SATA. Hard drive capacity: 320 GB, Hard drive rotational speed: 7200 RPM, Hard drive interface: Serial ATA. Power consumption (typical): 9.5 W, Power consumption (off): 1.50 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 %