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full-disclosure-uk: Re: [Full-disclosure] Disk wiping -- An alte

Re: [Full-disclosure] Disk wiping -- An alternate approach?

From: Christian Sciberras <uuf6429_at_nospam>
Date: Tue Jan 26 2010 - 16:04:46 GMT
To: Michael Holstein <michael.holstein@csuohio.edu>


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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