Re:

> Frank's requested DoD 5220-22.M specification.
...
> That discards DoD 5220-22.M spec methods "a", "b", and "m" so that only leaves method "d".
>
> Using method "d" has to write random characters.  Since zeroes are not a random character, using Paul's method won't work.

<plug>
WipeDisk supports DoD 5220-22.M clearing and sanitization methods
c and d:

   method  description

     c     Overwrite all addressable locations with a single character.

     d     Overwrite all addressable locations with a character,
           its complement, then a random character and verify.

...as described in the "Clearing and Sanitization Matrix"
in section 8-306 of the original **1995* 5220-22.M spec at
http://www.dss.mil/isec/nispom.htm.
(Note that the two later revisions to the spec removed the
data sanitization definitions.)

The next release will have the HIPPA recommended:

   “Overwrite all addressable locations with a character,
    then its complement. Verify ‘complement’ character was written
    successfully to all addressable locations, then
    overwrite all addressable locations with random characters;
    or verify third overwrite of random characters.”

</unplug>


--
Stan Sieler
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www.allegro.com/sieler/wanted/index.html

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