Normally, a deleted file is only removed from the directory entry of the file system and still can be easily recovered back from a file recovery software. If you want to completely wipe out any trace of a file, a file shredder or permanent file deleter can do the trick. It completely overwrites junk characters on the space occupied by the original file and makes it unrecoverable.
Permanent Eraser - It is one of the best file erasing utilities for Mac OS X. This excellent software not just deleted files from hard drives, but also permanently erases the files from CD/DVD.
File Shredder - It is a powerful file deleting software for Windows platform. It is a freeware and very light on system resources. File shredder fills the file space with random binary junk making completely unrecoverable.
AbsoluteShield File Shredder - Yet another powerful and free file eraser for Windows. It erasing process is lightning fast and is ideal for permanently deleting files in bulk.
Heidi Eraser - This file shredder is available for Windows 95, 98, ME, NT, 2000, XP, Vista, Windows 2003 Server and DOS. It is completely free and very light on system resources. This software is published under GNU General Public License and source code can be modified under license terms.
Easy Shred File Shredder - This is one of my favorite file shredding software. It has drag and drop support and shell integration. Simple right-click on a file and delete it forever. It is free and works on all major Windows OS.
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