W.D.80GB Hard Disk Drive Inside. USB 2.0.Interface for USB V2.0, compatible with USB V1.1. Works with both PC and Mac. Easy plug and play. Interface Transfer Rate: USBV2.0: 480Mbit / Sec. Power Adaptor: PS2 Power. Support: OS Support Win 98 / SE / ME / 2000 / XP. Mac OS 8.6 / 9.X / 10.X or above.