Fwd: Tandem Wipe Tool

[Dolosus Phantom <dolosus.phantom () gmail com>]

John,
     The U.S DoD standard is seven passes of writing 1's and 0's
usually by writing all 1's, then all 0's, followed by just seemingly
random data.  That should be sufficient for making sure no one can
retrieve it using normal means.  I say normal means because it is
still possible to use either Magnetic Force Microscopy (MFM) or
Magnetic Force Scanning Tunneling Microscopy(STM).  There is an
article that can be found at
http://www.cs.auckland.ac.nz/~pgut001/pubs/secure_del.html that covers
it.  Basically a device that is extremely sensitive to magnetic fields
is ran over the disk thus reading the residual magnetic fields left by
the 1's and 0's even if they have been over written.  The Scanning
Probe Microscopy (SPM) system then uses that dat ato create a drive
image.  Keep in mind that this is usually only done by certain
government agencies, but there are thousands of SPM's out there and a
reasonably capable SPM can be built for a little over a $1,000.  So if
you are really paranoid then just destroy the drive using one of the
well known mean, otherwise seven passes should be good.

Dolosus Phantom

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                 `...     `.
                     ``...  `.
                          `````.


-----Original Message-----
From: John Madden [mailto:chiwawa999 () yahoo com]
Sent: Wednesday, August 24, 2005 4:00 PM
To: security-basics () securityfocus com
Subject: Fwd: Tandem Wipe Tool

Hi,

In a follow up to my previous question, how many
passes does it take to ensure that the data is not
recoverable after writing 1's and 0's ? I've read 1
pass and 3 passes, so i'm not sure...

Any info would be greatly appreciated.

Thanks


---------- Forwarded message ----------
From: "John Madden" <chiwawa999 () yahoo com>
To: <security-basics () securityfocus com>
Date: Mon, 22 Aug 2005 17:21:21 -0400
Subject: Tandem Wipe Tool
Hi,

I was wondering if there are any tools that can scrub
the data or make sure that the data is not retrievable
on Tandem disk after it as been erased?

I've seen alot of tools for Windows, Linux etc.. but
not for Tandem in specific.

Thanks