I've read so many articles about how to go about trying to erase and rewrite all information on your HDD to the point where it cannot be recovered. If people were so worried about the fact that what they may have done was on those disks, then why dont they just scratch them up with some steal wool or something and set them free on the side of the road? If you ditch the HDD, could there be an other evidence left on the rest of your computer or periferals?