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Re: Disk wiping -- An alternate approach?
From: Christian Sciberras <uuf6429 () gmail com>
Date: Tue, 26 Jan 2010 17:15:07 +0100

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 () gmail 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 () 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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