Re: Disk wiping -- An alternate approach?

[T Biehn <tbiehn () gmail com>]

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 () gmail 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 () csuohio 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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