To *really* delete data requires *35* passes of overwriting with specific
bit patterns carefully designed with the disk coding schemes in mind.
very frightening! check out
http://www.cs.auckland.ac.nz/~pgut001/secure_del.html
for a good read!
-matt
-----------------------------------------------------------------------------
Matthew Nelson
Dynamics Technology, Inc.
21311 Hawthorne Blvd., Suite 300, Torrance, CA 90503-5610
Voice: (310) 543-5433 FAX: (310) 543-2117 Email: [EMAIL PROTECTED]
On Wed, 25 Oct 2000, Dan Horth wrote:
> uhm - so it *is* possible to recover data that has been overwritten?
> in my understanding once you write 1s and 0s over every sector of the
> HD there should be no way of knowing whether the sector was a 1 or a
> 0 before being overwritten?
>
> I thought that the data was insecure (recoverable) only when the
> directory file was deleted - but the sectors are not overwritten...
>
> I just find it kinda hard to imagine that someone would be able to
> work out what the data was in a sector if it was overwritten by
> completely new (even all null) data... whether it be consistent or
> random...
>
> hmm... not really sure if there's a point here... but it sure beats
> talking about elections in a country that I'm not in! ;)
>
> At 4:07 PM -0700 24/10/00, Sam Bayne wrote:
> >Anyway, you stated that you didn't need it to be a really secure
> >wipe, so it probably doesn't matter, but IIRC it is easier to
> >recover data overwritten by a consistent pattern than a random mix.
> >I think more different-pattern wipes are harder to read through than
> >one pass of any amount of randomness, though.
> --
>
> Nitro - 3D Visualisation, Graphics & Animation
> Ph (+61 2) 9810 5177 - Fx (+61 2) 9810 0199
> http://www.nitro.com.au/
>
>
>
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