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> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:[log in to unmask]] On Behalf Of Richard L. Hess
> Sent: Monday, October 03, 2005 9:36 PM
> To: [log in to unmask]
> Subject: Re: [ARSCLIST] Requiem for the DAT (redux, was Storage of audio
> CDs)
> 
> At 08:49 PM 10/3/2005, Tom Fine wrote:
> >Hi Richard:
> >
> >I'd worry even more about the dual-layer DVD
> >media, just based on historical experience with multi-layer plastic
> >products.
> 
> Tom, Aren't all DVDs two layers of plastic?

Every DVD is assembled from two 0.6 mm thick half-discs, with the
information layer in the middle. Single layer discs have only one
information layer. Dual layer discs have two information layers separated by
a 55 micrometer thick spacer layer.

Jerry
Media Sciences, Inc.