I DBAN’d my laptop a while ago and was told that I have to scan over and replace every bit of the hard drive multiple times or else hackers could still get the data. How are they able to do this?
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When you “delete” a file, your computer simply marks that space as usable for something else. It might get overwritten eventually as you save new stuff, but it also might not. That’s how deleted files can sometimes be recovered.
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