21 Oct
2006
21 Oct
'06
2:13 p.m.
From: Ray Arachelian <ray at arachelian.com>
The platters are very well protected by the
metal case. There are holes
for air, (hard drives don't like working in a vacuum or low air
pressure) and of course holes for the control/data cables, so it's not a
perfect Faraday cage, but it's close enough.
Hi
The main issue for drive is magnetic fields. Surprisingly, the write
is more sensative than the read to stray field. This is because
during writes, general bias one way or the other effects the
amplitude of the signal. Reading is looking for edges and bias
has little effect.
Actually erasing would take a very strong magnetic field from
any distance to the drive( inverse square law ).
Dwight
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