Mediacom SpaceBook 3.0 640GB. Hard drive capacity: 640 GB, Hard drive interface: Serial ATA II, 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: Blue. Mac operating systems supported: Mac OS 9.0. Width: 128 mm, Depth: 80 mm, Height: 16 mm