Samsung HX-MTA64DA, S Series. Hard drive capacity: 640 GB, Hard drive rotational speed: 5400 RPM, Hard drive interface: USB 3.0. Colour of product: Grey. Weight: 0.165 kg, Width: 82 mm, Depth: 111 mm. Operating temperature range (T-T): 5 - 40 °C, Storage temperature range (T-T): -20 - 65 °C. Data transfer rate (max): 5000 Mbit/s, Cable length: 0.8 m