Iomega ZIP Drives: Iomega External 250 MB USB Zip Drive With its USB cable that provides both data and power, the Zip® 250MB USB Powered Drive does not need an external power source. It is easy to connect (just plug it in) and easy to launch (no rebooting). Not only is the new Zip® 250MB USB Powered Drive an easy to use portable storage solution, but it's also great looking and lightweight at only nine ounces. Plus, the new 250 is compatible with most major operating systems and all Zip 100MB and 250MB Zip disks.