Re: [ARSCLIST] Further thoughts on the new CLIR report. DVDs

[Jerome Hartke <jhartke@xxxxxxxxxxxx>]

CD uses a cross-interleaved Reed-Solomon code at the frame level of all
discs. DVD does not, but instead uses a Reed-Solomon product code, as does
the sector level of CD-ROM discs.

Jerry
Media Sciences, Inc.

> -----Original Message-----
> From: Association for Recorded Sound Discussion List
> [mailto:ARSCLIST@xxxxxxx] On Behalf Of Steven Smolian
> Sent: Saturday, March 25, 2006 9:49 PM
> To: ARSCLIST@xxxxxxxxxxxxxxxx
> Subject: Re: [ARSCLIST] Further thoughts on the new CLIR report. DVDs
> 
> Mike, et al,
> 
> Is there a reasonable amount of interleaving as on CDs?
> 
> Steve Smolian
> 
> ----- Original Message -----
> From: "Mike Richter" <mrichter@xxxxxxx>
> To: <ARSCLIST@xxxxxxxxxxxx>
> Sent: Saturday, March 25, 2006 9:38 PM
> Subject: Re: [ARSCLIST] Further thoughts on the new CLIR report. DVDs
> 
> 
> > steven c wrote:
> >
> >> Question for the technically knowledgeable...
> >>
> >> Since CD's and DVD's are (AFAIK) more or less the "same animal" and
> >> operate by pressing (or "burning") pits into the surface of a plastic
> >> disc, why should there be any difference in the lifespan of the two?
> >>
> >> Do the littler "holes" fill themselves up more rapidly?
> >
> > The materials are different, though similar. In particular, the dyes
> > proved for recordable CDs are not usable for DVD.
> >
> > The data density is higher on DVD than on CD. As a result, apart from
> > ECC it takes less damage to lose information from a DVD than from a CD.
> >
> > I believer there are also additional failure modes for DVD, notably
> > those associated with dual layers.
> >
> > Mike
> > --
> > mrichter@xxxxxxx
> > http://www.mrichter.com/
> >
> >
> > --
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