Gutman Method on Empty Space

Marc Silver marcs at
Thu Jan 17 01:02:18 PST 2008

Hi there,

On Thu, Jan 17, 2008 at 09:43:46AM +0100, Wojciech Puchar wrote:
> how? even single write is enough

Not according to the paper that Gutmann wrote:

In short, he says that if you know how the data itself was overwritten
it can be recovered.  If I recall, the DoD standard for the deletion of
data is to overwrite it 3 times.  

Obviously it all comes down to how important the data is that you're
removing, but a single write is not enough if the data needs to be
disposed of 'securely'.


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