Silicon Power 1TB Diamond D05. Hard drive capacity: 1000 GB, Hard drive interface: USB 3.0, Hard drive size: 63.5 mm (2.5 "). Data transfer rate: 5000 Mbit/s, USB data transfer rates: 5000 Mbit/s. Colour of product: Grey. Mac operating systems supported: Mac OS X 10.4 Tiger. Weight: 205 g, Width: 124.8 mm, Depth: 75.8 mm