Toshiba Automatic Backup 500 GB USB 3.0 Portable Hard Drive - PH2050U-1EWL (Blue) USB 3.0 & USB 2.0 Compatible Preloaded with NTI Pocket Data Backup, Just plug it in to your computer and backup starts automatically Backup multiple computers to one drive, Ready to use right out of the box No software to install runs directly on your drive Compatibility Windows XP, Vista, 7