I've owned a computer business 22 years now. The amount of ignorance about how hard drives work and how to properly clean a hard drive astounds me. No wonder so many people are caught after they think they removed their data. Only a couple answers in this whole thread are correct for cleaning a HD so old data can't be recovered. Believe me there is no mystery of how they work and how to properly clean them. Formats, system restores will all leave traces that are easy to find. Not until you actually over-write every sector on the drive is the data gone. That is what Dban and a ton of other good DOD grade utilities do. System restores and system formats just overwrite a portion of the disk needed for the new files, all the old sectors it doesn't use on restore are sitting there with all the data. If your method doesn't include writing to EVERY sector of the disk several times then you're not removing everything and evidence is still there. If all you do is a system restore then a real computer guy will read your old data like he reads the Sunday paper. If you're not a real computer person quit giving bad advice and get rid of the hard drive, just destroy it with a hammer and go bury it somewhere.