Michael Perelman wrote:
Bill, I don't understand. I though that the system magnetically writes a 0 or a 1 on
each location & that programs are available that overwrite everything with 0's. Are
you saying that the spot on the drive can be a 0 with a residue of a 1?
the residues go to zero as your write and write and write and write over
the 0:
http://wipe.sourceforge.net/secure_del.html
http://en.wikipedia.org/wiki/Data_remanence
this is used for secure *file* deletion in many sensitive applications,
and the US Govt requires so many passes to meet a specification (for
non-mil work). up until Nov 2007 this was even accepted by the dept of
defense, but that second link above now says NSA requires complete
degaussing or destruction of disk. i would guess that s because disks
are so cheap now, rather than a weakness in the wiping mechanism.
Les
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