The 500GB G-Drive Mobile USB Portable Hard Drive by G-Technology allows you to store up to 500GB of files and is powered via its USB 2.0 connection to your computer. The drive can be used for storing documents, music, photos, video and more. It comes pre-formatted for the Mac and can be used for backups using Time Machine. This drive needs to be reformatted for use with Windows systems. Included with the aluminum G-Drive Mobile is a USB cable.