Store your favorite videos, music, photos, and important files on this sleek and compact drive and take them with you anywhere. Designed with the same commitment to quality that made WD external drives the number one selling drives in the world. Designed for use with Windows-based computers. Can be easily reformatted for use with Macs. Weighing in at only a few ounces, these small drives fit easily into a pocket or purse. Just plug it into a USB port and you're up and running instantly. These drives require no power adapter- they are powered directly though the USB cable.