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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While i don’t know exactly how the program you use works, it has to do with how computers store data.
When you save a file for example, it stores it in a certain location on the drive, and the marks that location as a saved file so it doesn’t get overwritten.
When you then go an delete that file, all the computer does is remove that “don’t overwrite” mark. So the data is actually still stored there, it’s just free’d up and could get replaced with a new file.
So the original data doesn’t actually disappear until something comes along and replace it or something runs that Forcibly replaces it.
Until then the data is still recoverable.
Again, idk exactly how the program you mentioned works, so maybe it does what I described, maybe it doesn’t. But that is how people can get “deleted” data.
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