From Privacy Root
Free tool to make already deleted files and folders unrecoverable. Includes several security algorithms to make anti-recovery process the most effective. Easy interface allows you in a few steps select disks, see estimated completion time and choose some additional options.
This tool can run on any hard disks and almost any removable storage (like USB disks) where you have deleted some sensitive data so nobody will be able to restore it. Recommended for any sort of users: home and corporate (banks, military, attorneys e.t.c.) because top security standards used in the program.
# Why this program should overwrite all free disk space?
While working Prevent Restore takes all free disk space, but when finished free space will be returned to previous condition. Don't worry about that. Its made to make sure that all possible free space was overwritten. The main reason why it should be done this way is that Windows write files to any place on the hard disk - to the end of free space, to the beginning, in the middle... And the result is that deleted files located everywhere! That's why its important to fill out all free disk space.
# Will it work with removable storage?
Yes, Prevent Restore can wipe deleted files on any disk like usb flash disk, memory stick or