Delete files permanently to counter file recovery tools

It is a well know fact that files that are deleted by normal means can be recovered with ease using so called file recovery utilities. This might not be a problem for most users but it surely is not nice if you sell a used computer and someone discovers private pictures, account data and the like on the formatted hard drive.

Super Shredder from analog x deletes files securely so that they can´t be recovered by file recovery software. There are still ways to recover those files but the equipment needed is way to expensive for almost everyone. The tool supports common methods like Gutmann or Nispom (Departement of Defense) but also a way to completely customize the procedure.

Eraser is another tool which could be used.