Western Digital My Passport Essential 320GB. Hard drive capacity: 320 GB, Hard drive rotational speed: 5400 RPM, Hard drive interface: USB 2.0. Colour of product: Blue. Weight: 180 g, Width: 104.8 mm, Depth: 126.15 mm. Operating temperature range (T-T): 5 - 40 °C, Storage temperature range (T-T): -20 - 65 °C. Certification: RoHS