The Iomega Zip 100 Blue Translucent USB-Powered External Drive Z100USB is a 3.5-inch external drive with a storage capacity of 100 MB. It is compatible with PCs and features a USB interface for easy connectivity. This unit, from the Expansion product line, is designed with a blue color and a sleek form factor. With a write speed that is 2x faster and a cache of 16 MB, this external drive is a convenient and reliable option for expanding storage capacity on your computer.