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On Wed, 23 Mar 2005, Dwight K. Elvey wrote:

>  The disk read is the same, it needs to see data
> from the disk surface to keep the threshold detection
> circuit from having false detects from noise and random
> level shifts.

Dwight,

Thanks for the clarification.  It's very interesting, and does explain a
lot!

-- 

Sellam Ismail                                        Vintage Computer Festival
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