Free File Shredder
Wednesday, July 30th, 2008One of the things I noticed when I started playing with the Partition Recovery program I reviewed below was that such image backup and recovery is at the lowest possible byte level across the entire drive. When I recovered the image, it recovered all possible files that could have existed on that image including files that I had previously deleted and even after formatting the drive over top of those deleted files several times these files still appeared to exist after a full recovery of the drive image.
I quickly discovered the need for a file shredder. This is a software package that will write random data over the blank sections of your hard drive. You see when you delete a file in Windows is simply marks the file as deleted in the file system table. So the file data is still there but the pointer to that file no-longer exists. Thus Windows thinks the file is deleted. A file recovery program will search those sections of your hard drive and give you the opportunity to recover files that do not have any pointers to them but as long as the file still exists on the drive and has not been written over then these recovery tools can recover the data in that file.
This can be a security issue, because if that file data is still physically on the drive then there are other programs that could gain access to it, such as a worm or virus. Thus data that you intended to delete is now suspect to recovery from nefarious software that could be on your system.
A file shredder will of course, as I’ve described write random data over these empty sections of the drive that don’t have active pointers pointing to those areas. Basically it’s writing data over all the areas of your drive that may or may not have either blank data or data which you have previously deleted. It also means that recovery from a drive where the empty space as been shredded will not have any chance of resurecting any files from previous installs, or worse bringing to life a virus that was previously removed.