Secure Disk is a Win95/98/NT/2000 free disk space wiper utility. Deleting a file normally just removes a files directory entry, but the data itself remains on the disk. Secure Disk completely eliminates the contents of these deleted files. Secure Disk will cleans up the empty space on the disk by creating a temporary file named Cleaned.tmp (all zeros) at the root of the drive being cleaned. Registered users can use file shredder and US Government multipass method specified by NSA.