Overwrites files so the data cannot be recovered. Can wipe entire hard disk.
Wiperaser is a secure data deletion tool. Unrecoverably wipe files and folders.
Terminator - Emergency data deleting from hard discs of a computer.
Effortless encryption, advanced file hiding, and secure file deletion.

data deletion secure deletion prevent deletion

information deletion files deletion unrecoverable deletion

deletion of logos file deletion duplicate file deletion