Transcend 640GB StoreJet 25M3, StoreJet. Hard drive capacity: 640 GB, Hard drive rotational speed: 5400 RPM, Hard drive interface: Serial ATA. Colour of product: Black. Power consumption (typical): 5 W. Weight: 80.8 g, Width: 204 mm, Depth: 126 mm. Operating temperature range (T-T): 5 - 55 °C