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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 <firstname.lastname@example.org> wrote:
> Overwritten files require analysis with a 'big expensive machine.'
> I doubt they ever recover the full file.
> On Tue, Jan 26, 2010 at 11:04 AM, Christian Sciberras <email@example.com>
> > 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
> > 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
> > <firstname.lastname@example.org> 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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