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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The “wipe multiple times” thing originated with older, magnetic hardware. It was theorized that even if you wipe such hardware once or twice, there might be some magnetic residue you could examine using a microscope to determine previous magnetic states.
It almost has no bearing on modern day magnetic drives and certainly has no bearing on non-magnetic media. Even the US Department of Defense has dropped the “wipe multiple times” standard.
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