[Bulk] Re:Writing over a drive using /dev/zero

[James Knott]

Christopher Browne wrote:
> Here lies the non-intuitive part of digital technology, namely the
> fact that it is implemented using what really are inherently analog
> technologies.  0 and 1 aren't absolutes - they represent things like:
> - 0 = signal below some threshold, 1 = signal above that threshold
> - 1 = enough of the region of magnetic surface "charged up," 0 = not
> enough "charged"
Actually, magnetic recording relies on the direction of magnetic domains 
on the recording surface, so a "1" would have most of the magnetic 
domains in one direction and a "0" would be in the opposite direction.
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