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Date:      Sat, 19 Jan 2008 23:21:00 +0000
From:      RW <fbsd06@mlists.homeunix.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: Gutmann Method on Empty Space
Message-ID:  <20080119232100.7fc1c195@gumby.homeunix.com.>
In-Reply-To: <4791A8F3.7090601@highperformance.net>
References:  <478F0D5A.9090107@highperformance.net> <20080117081414.GB12470@draenor.org> <478F1049.3000706@boosten.org> <20080117083837.GC12470@draenor.org> <20080117094332.K1563@wojtek.tensor.gdynia.pl> <20080117090210.GD12470@draenor.org> <478F8980.1090301@highperformance.net> <20080118175831.72929086@gumby.homeunix.com.> <4791A8F3.7090601@highperformance.net>

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On Fri, 18 Jan 2008 23:38:27 -0800
"Jason C. Wells" <jcw@highperformance.net> wrote:


> It's interesting to note that Gutmann's earlier work said, loosely
> "If you do this, you should be fairly certain you data is
> unrecoverable." He now says, "A few passes of random data is as good
> as can be expected."  Those two standards of performance are very
> different.  

But he goes on to say:

"Looking at this from the other point of view, with the ever-increasing
data density on disk platters and a corresponding reduction in feature
size and use of exotic techniques to record data on the medium, it's
unlikely that anything can be recovered from any recent drive except
perhaps a single level via basic error-cancelling techniques." 

So even those few passes of random data are overkill.

>          I just want to make sure that any given day that the police
> come take my functioning computers way that nothing can be recovered
> that I explicitly deleted.  

The police just take disk images.



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