The FreeAgent Pro is a 750GB external hard drive. The FreeAgent Pro has the ability to move data to where you need it most. Automatically send a project to a flash drive, copy audio to your MP3 player, upload photos, and put your entire "My Documents" folder on your website for access anytime, anywhere. The Free Agent Pro software and drive formatting works only with Windows, but the drive can easily be reformatted for a Mac with OS X's Disk Utility. This portable hard drive is also compatible with Windows Vista (as well as Windows XP and Windows 2000), allowing you to backup your content regardless of operating system upgrades.