The FreeAgent Go External Hard Drive presents both function and style. At a size of 0.49 x 3.15 x 5.12-inches and a weight of a mere 4.65 oz., it has a rotational speed of 5400 RPM and works with USB 2.0 at a speed of up to 480 Mb/s.Compatible with Windows XP/Vista and Mac, an optional Dock station is also available. Choose from recently reduced prices of $79.99 for 250GB, $99.99 for 320GB and $129.99 for 500 GB in your choice of 10 colors.