Hitachi Touro Mobile MX3 750GB. Hard drive capacity: 750 GB, Hard drive rotational speed: 5400 RPM, Hard drive interface: USB 3.0. USB data transfer rates: 5000 Mbit/s. Colour of product: Black. Mac operating systems supported: Mac OS X 10.5 Leopard. Width: 80 mm, Depth: 126 mm, Height: 15 mm