Imation 27390 Apollo Expert UX 2.5" 320GB Portable Hard Drive Imation's Apollo Expert UX portable hard drive features an integrated stand for vertical or horizontal orientation The simple, plug-n-play format enables you to drag and drop files and transfer data from any computer with a USB 1.1 or 2.0 port. Power Supply - USB bus powered Compatibility - Windows XP/Vista Mac OS 10.4 and above Dimensions (LxWxH) - 7.25 x 4.63 x 2.25