I'm looking for a program (freeware is good, but I'll pay for something I value) that will do a zero-write (US Gov't quality) to the un-used portion of an otherwise in-use hard drive. I don't want something that will wipe my entire drive, I just want to wipe the un-used portions of the drive. Basically like Norton's file shredder, but rather than drag-n-drop files, I want it to automatically zero-write the un-used portions of my hard drives.

PGP Freeware v6.5.8 has a disk wipe utility. It runs fine on XP if that's what you use
http://web.mit.edu/network/pgp.html

Has anyone used this???

Thanks iweb - but I don't want something to wipe an entire disk (or partition). Just wipe the free space.

I did however find what I'm looking for: BCWipe. Works flawlessly so far.

PGP Freeware can wipe free space