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Authored by: pcunix on Feb 06, '09 05:55:31PM  I can't find the
article right now, but if I remember correctly it has to do with
the slightly wobbly nature of the magnetic spots - the head
movements aren't precise so they overlap - meaning some of the
original is off to the left or the right.. and that can be
picked up with specialized equipment.  Tony Lawrence Free SCO,
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