Zip 250MB external drive offers sleek, ultra-thin and lightweight design and a portable, high capacity storage solution. Easy plug and play. USB powered drive includes IomegaWare (PC and Mac); Iomega Automatic Backup software to make backup a snap; and Iomega Sync software to transfer files between computers seamlessly. Reads and writes Zip 250MB and 100MB disks. USB 1.1 Works with USB 2.0 at 1.1 speeds. Mac and PC compatible. No external power supply is needed. Use the single USB cable to provide data and power to your Mac or PC.