Western Digital My Book Essential 1TB. Hard drive capacity: 1000 GB, Hard drive rotational speed: 7200 RPM, Hard drive interface: USB 3.0, USB 2.0. Colour of product: Black. Weight: 1.18 kg, Width: 48 mm, Depth: 135 mm. Operating temperature range (T-T): 5 - 35 °C, Storage temperature range (T-T): -20 - 65 °C. Compatibility: NTFS, Data transfer rate: 5 Gbit/s, Minimum system requirements: USB