🚀 go-pugleaf

spc@pineal.sci.fau.edu (Sean 'Captain Napalm' Conner) writes:

> In article <27JUL199209444686@erin.caltech.edu> shoppa@erin.caltech.edu (TIM 
> >	Also, I believe the same article pointed out that music *could* be
> >recorded on both sides!  Has anyone actually seen this done?  It would mean
> >that program information (and the trendy art designs) we are used to would
> >be non-existent or in the very center circle of the CD.
> >
>   I don't know about that.  I've found that if I hold up a CD to a bright lig
> I can actually SEE through it!  Although I'm sure that two layers could proba
> be packed into the CD.
> 
>   Also, if the music is on both sides, then there goes all the information th
> is currently printed on the CD's top side.

Technically, most CD's are made in a process that is inherently single-sided.
To put it bluntly, the layering during the press stage is asymetric.  Double-
sided disks could be made, but then we would run into a MAJOR problem, detailed
below.

> 
>   -spc (And when we do get DSCD's (Double Sided Compac Disks), does that mean
> 	we have to flip the CD over, or buy a Double Sided CD player?)
 
Hmmm... This reminds me of the "flippy" dilemma, which illustrated that use of
a flippy disk was incompatible with true double-sided media.  This is why
WORM disks have to be flipped... Or, a bidirectional motor could be used, so
that, when the side was changed, the rotational direction changed.  Just 
don't flip sides very often.  Or, you COULD design true double sided disks, but
then the "flip" side would be backwards relative to a single-sided player.

Lamar Owen, Systems Consultant, GE Lighting Systems, Hendersonville, NC
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