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.

Update: Super Shredder has been removed from the AnalogX website. We have uploaded the latest version of the program to our servers. Just click on the following download link to download the latest release version of the software program: Super Shredder (2)

Please note that the program has not been updated for a while, and that you might want to use a different program like the aforementioned Eraser instead to ensure compatibility with your operating system.

Eraser uses a different methodology. Instead of making sure that individual files cannot be recovered anymore, it runs on all free disk space of a selected hard drive to make everything that was once stored there unrecoverable.

It goes without saying that you need to run Eraser regularly to make sure newly deleted files cannot be recovered as well. Eraser can be configured to run on schedule, which basically means that it will delete all file traces regularly.