Transcend 500GB USB 3.0. Hard drive capacity: 500 GB, Hard drive rotational speed: 5400 RPM, Hard drive interface: USB 3.0. USB data transfer rates: 5000 Mbit/s. Colour of product: Black, Violet. Power consumption (typical): 5 W. Mac operating systems supported: Mac OS X 10.4 Tiger, Mac OS X 10.5 Leopard, Mac OS X 10.6 Snow Leopard, Mac OS X 10.7 Lion