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Hi Richard:

Yes, I think all DVD's start out with 2 layers but the dual-4.7 gig discs
(which now hold as much as a commercial DVD and thus a 1:1 copy can be made
using various pirateware programs) have a second layer of burnable material,
as I understand it, and perhaps a clear plastic film separation layer (?).

I, too, send out a lot of DVD+/-R discs and do also strongly suggest many
copies be made, including on different media.

We may be chasing a phantom menace here but like I said I haven't seen any
data comparable to the NASA and NIST tests on CDR media.

-- Tom Fine

----- Original Message ----- 
From: "Richard L. Hess" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, October 03, 2005 9:35 PM
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?
>
>
> >I would bet that for every one DAT mechanism ever manufactured (and I'd
> >guess maybe 50% of all ever made, or more, are no longer in good working
> >order), there have been 20+ laser-bearing drives made that can read most
or
> >all formats of 5" plastic discs. And for every DAT tape ever spooled,
maybe
> >50+ blank CDR's have rolled out of Asian factories. That's a good
harbinger
> >for the long-term viability of the CDR format.
>
> My guess is, that even including DataDATs, your numbers are way low.
> I would think the ratio is way higher, but even at your numbers...
>
> >This is an example where
> >industry standardization on a method and form factor is a very Good
Thing.
> >I'm hoping very much that DVD+/-R is a continuation of the Good Thing but
> >it's pretty early to pass judgement.
>
> I do send out a fair amount of work on DVD-R discs and tell people
> PLEASE make copies, and I keep their originals and my files around
> until they let me know they are happy and have checked everything.
>
> Cheers,
>
> Richard
>
>
> Richard L. Hess                           email: [log in to unmask]
> Vignettes
> Media                           web:   http://www.richardhess.com/tape/
> Aurora, Ontario, Canada             (905) 713 6733     1-877-TAPE-FIX
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