You are thinking of a "write zeros" program. I personally think they aren't that useful - just do the "long format" when you reinsall Windows. Works just as good. Doesn't write 0s to the HD, but will perform just as well. The only time you want to write 0s to your HD is to get rid of personal/private information if you are going to sell or give away your computer. That's my opinion!
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Off the record, on the q.t., and very hush-hush.
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