WD Elements SE is a maximum capacity hard drive in a small and compact design that makes it easy to store all your important files and take them with you. It's easy to use. Just plug it in to any USB port and start saving your photos, music, videos, and files. Still sleek and compact, you can slip it in your pocket and take it with you anywhere.These drives require no power adapter because they are powered directly though the USB cable. Capacities: 1 TB, 750 GB, 640 GB, 500 GB.