Re: [ARSCLIST] Preservation media WAS: Cataloguing still :-)

[Mike Richter <mrichter@xxxxxxx>]

Dnjchi@xxxxxxx wrote:
>  
> In a message dated 9/4/2006 10:28:05 AM Eastern Daylight Time,  
> doncox@xxxxxxxxxxxxxx writes:
>
> The  signal on a manufactured CD is basically the shape of a piece of
> plastic,  just like a vinyl LP.
>
>
>
> Is a CD pressed onto the plastic? Or onto the aluminum core?
>  
> Don Chichester

The signal is pressed into the plastic. Metallizing over that plastic 
conforms to the pressed shape. Reflection from the metal provides the 
signal sensed in reading.

Mike
--
mrichter@xxxxxxx
http://www.mrichter.com/