This extension together with Norton FileSaver performs to 2 key functions : Saves disk and file protection data. Norton FileSaver maintains special 'invisible' files on your disk with information that UnErase uses to recover accidentally erased files, and Norton Disk Doctor and Volume Recover use to repair or recover damaged disks. Checks disk automatically. Norton FileSaver examines your disks at prescribed intervals or directory damage and file fragmentation without affecting system preformance. If a problem is detected, Norton FileSaver gives you the option of running Norton Disk Doctor to prevent small problems from becoming big problems. If significant file fragmentation is detected, you are advised to run Speed Disk.