Western Digital Passport Essential 250GB. Hard drive capacity: 250 GB, Hard drive rotational speed: 5400 RPM, Hard drive interface: USB 2.0. Colour of product: Black. Weight: 104.8 g, Width: 79.78 mm, Depth: 129.78 mm. Operating temperature range (T-T): 5 - 40 °C, Storage temperature range (T-T): -20 - 65 °C. Hard disk transfer rate: 480 Mbit/s