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Posted by Unruh on February 23, 2008, 10:17 am
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>| On another list, someone asked a question which piqued my
>| curiosity.
>|
>| U.S. DoD requires 7 overwrites. The OP wanted a '*technical*
>| justification of "15-times" or any other number. Technical one,
>| not "because mama said so".'
>|
>| Has anyone actually recovered data that's been overwritten
>| even once by random data? Twice?
>|
>| We know about the theoretical techniques to get the data. We
>| know it would be horrendously expensive. But has anyone
>| *actually* done it?
>|
>| And, regardless, is there some number of overwrites that
>| *will* make the data unrecoverable? The OP was looking for
>| something better than pulling a number out of the air (or
>| wherever) - a number with some theoretical or experimental
>| justification.
>|
>| I figured if anyone had the answers (and was allowed to give
>| them), it would likely be someone in this group.
>|
>The DoD requirements are...
>Write a bit pattern such as; 10101010
>Write its complement; 01010101
>Write another pattern such as; 11110000
>Perform that six times.
>The disk will then be sanitized.
The dod is a bureacracy. Although the recmmendation probably made sense
once, once they had been promulgated they will never again change no matter
how the technology changes. To relax them puts someone's ass on the line.
What if he aralaxes them and suddenly some data leaks. Thus they are frozen
in time even if they make no sense whatsoever.
I would not take their recommendation as indicating anything whtsoever
about what the current best proctice is. While doing what they say may not
harm except that the wipe taks 2 days rather than 20min.-- which means
noone does it.
>--
>Dave
>http://www.claymania.com/removal-trojan-adware.html
>Multi-AV - http://www.pctipp.ch/downloads/dl/35905.asp
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