Transcend 25M, StoreJet. Hard drive capacity: 640 GB, Hard drive rotational speed: 5400 RPM, Hard drive interface: Serial ATA. Colour of product: Red. Windows operating systems supported: Windows 2000, Windows 7, Windows Vista, Windows XP. Weight: 0.206 kg, Width: 82.4 mm, Depth: 134 mm. Operating temperature range (T-T): 5 - 55 °C, Storage temperature range (T-T): -30 - 70 °C