i used to have a program called Kremlin that said it filled those parts o your computer with the old 1's and 0's and then wipes it clean.. said it could foil any forensics software.
the problem with it was this... you damn well better make sure that you had nothing running in the background when it ran or you'd be reformatting the drive LOL
why'd i have it.. confession.. in days gone by (years and years ago 10 years ago to be exact

) i played on the dark side a little
spaz