Allan Baer wrote:
> I do not believe anyone knows that answer. My view is that since the
> area
> inside a sector is written (electrical patterns) over and over millions
> of
> times. That the coating may fail to accept the electrical pattern
Alan has the right idea, but it uses magnetic polarization of the
ferric oxide (iron) in the coating. And yes, the coating does
eventually
become un-magnetizable (I think I just made up a new word ;-} )due to
physical wear and residual polarizations from previous writings.
--
Jim Meagher
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