full-disclosure - Re: Disk wiping -- An alternate approach?

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Date: Tue, 26 Jan 2010 17:15:07 +0100
From: Christian Sciberras <uuf6429@...il.com>
To: T Biehn <tbiehn@...il.com>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: Disk wiping -- An alternate approach?

It would be a part of the algorithm, to make sure the overwritten file is
readable. But if those machines get any smaller, I guess these would be the
next generation of storage media take bluerays vs dvds for example.




On Tue, Jan 26, 2010 at 5:11 PM, T Biehn <tbiehn@...il.com> wrote:

> Overwritten files require analysis with a 'big expensive machine.'
> I doubt they ever recover the full file.
>
> -Travis
>
> On Tue, Jan 26, 2010 at 11:04 AM, Christian Sciberras <uuf6429@...il.com>
> wrote:
> > I was thinking, since all this (reasonable) fuss on wiping a disk over 10
> > times to ensure non-readability, how come we're yet very limited on space
> > usage?
> > If, for example, I overwrote a bitmap file with a text one, what stops
> the
> > computer from recovering/storing both (without using additional space)?
> > Just a couple curiosities of mine.
> >
> >
> >
> >
> >
> > On Tue, Jan 26, 2010 at 4:08 PM, Michael Holstein
> > <michael.holstein@...ohio.edu> wrote:
> >>
> >> > By the way, does somebody knows about the flash memory?
> >> > Is zeroing a whole usb key enough to make the data unrecoverable?
> >> >
> >>
> >> No, wear-leveling (done at the memory controller level) will dynamically
> >> re-map addresses on the actual flash chip to ensure a relatively
> >> consistent number of write cycles across the entire drive.
> >>
> >> The only way to completely "wipe" a flash disk is with a hammer.
> >>
> >> Regards,
> >>
> >> Michael Holstein
> >> Cleveland State University
> >>
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>

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