You can use SDelete both to securely delete existing files, as well as to securely erase any file data that exists in the unallocated portions of a disk (including files that you have already deleted or encrypted). SDelete implements the Department of Defense clearing and sanitizing standard DOD 5220.22-M, to give you confidence that once deleted with SDelete, your file data is gone forever
THe PGP freespace wipe is a very good protocol as well..... Swin *believes* that it conforms that standard at 7X overwrite, and has capacity up to the low 20X's, but he hasn't viewed the documentation recently.
It's worth reading around to find what software you can trust to do this. There are free applications around that will do this.
Note also that the 'Gutmann Wipe' is outdated: modern drives use much higher densities and different encoding techniques. It isn't worth overwriting more than a few times. In most cases, a single overwrite will be sufficient.
i just read in the manual for the sdelete app i listed above that it doesnt delete file names from free space, just the data, so i ll see if theirs an app that does...
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