From: David Mann
On Nov 12, 2011, at 10:41 AM, Cotty wrote:
FWIW I once filmed here:
<http://www.ontrackdatarecovery.co.uk/>
and I asked one of the techs what the best method of hard drive security
was if (say) I was selling a computer 2nd hand. His answer was simple
and straightforward: take the hard drive out and destroy it by hammering
nails through the platters. That is apparently the only way to be 100% sure.
Nuke it from orbit, that's the only way to be sure.
I seem to remember a guy offering a prize for any data recovery firm who could
recover a drive that he'd wiped by simply zeroing it out in one pass. I'm too
lazy to look it up, but last I heard there hadn't been any takers. Take that
to mean whatever you like
Dave
The Army required us to use a program that would write all zeros to
every site on the platter. The program would then go back and rewrite
ones to every site. It repeated that a minimum 7 times.
I was told this was to reverse the polarity of every magnetic site on
the platter multiple times and that after that was done there was no way
to recover any data that might have once been on the disk. And that was
for a drive that never had any classified information on it; one that
was going to be re-formatted and have a new operating system installed
in order to be re-used.
You didn't run the program yourself, you turned the disk in to the the
S-6 (commo) section who had a machine to run the program. Controls on
hard-drives that had ever had even the lowest level of classified
documents on them were even stricter.
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