Freecom Mobile Drive Classic II 500GB, Mobile Drive. Hard drive capacity: 500 GB, Hard drive interface: USB 2.0, Hard drive size: 63.5 mm (2.5 "). Colour of product: Black. Weight: 140 g, Width: 115 mm, Depth: 76 mm. Operating temperature range (T-T): 10 - 35 °C, Storage temperature range (T-T): -20 - 70 °C. Hard disk transfer rate: 480 Mbit/s, Mean time between failures (MTBF): 50000 h, Minimum hard disk space: 2048 MB