Verbatim Store "n" Go USM 500GB. Hard drive capacity: 500 GB, Hard drive interface: Serial ATA III, Drive device, buffer size: 8 MB. Data transfer rate: 6000 Mbit/s, USB data transfer rates: 12, 480, 5000 Mbit/s. Colour of product: Black. 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. Weight: 150 g, Width: 80 mm, Depth: 121 mm