Imation Apollo M100 1TB. 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. Colour of product: Black. Mac operating systems supported: Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion. Weight: 139 g, Width: 117 mm, Depth: 80 mm