If you want to sell a PC or lend someone a USB stick, it is easy for them to retrieve files from it. There are all kinds of more and less advanced techniques for that purpose, ranging from Windows own Recycle Bin to programs that restore formatted disks. If you would rather not have the receiver of the PC or stick dig into your computer past, there is MooO Anti-Recovery, which makes erased data inaccessible in several steps. It empties the Recycle Bin, tackles free disk space (where many deleted files reside) and more.
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MooO Anti-Recovery – Make deleted information really disappear