Once upon a time there was a man named Peter Gutmann who suggested
that with the use of an electron microscope you might be able to
figure out what was once written to a part of a hard drive that had
been overwritten. That lead people to come up with policies like “you
have to overwrite 7 times before it is safe to dispose of.” However,
despite all the assurances I’ve heard that it can be done, nobody
knows anyone that has actually done it. A couple years back I took a
forensic class with Mike Murr from the SANS institute and he was
talking about this very thing.Everyone knows someone that has done it,
but nobody has done it themself.
Como uma linha de guia geral, limpar a unidade 3 vezes é a contagem máxima de limpeza que eu usarei. Além disso, é um exagero, a menos que você esteja lidando com dados extremamente confidenciais.
Qualquer dado recuperado após 2 toalhetes é provavelmente impossível. 3 ou 5, tornaria praticamente impossível.