On Fri, 2005-08-05 at 14:42 -0400, Peter Arremann wrote:
> Hmm - MO needs a magnetic read head... I guess the technology you
> guys mean is PD as the base for DVD-+RW...
DVD-RW and DVD+RW are Phase Change, not Phase Dual IIRC.
DVD-RAM, like PD-CD before it, is a MO variant called Phase Dual.
> Phase Change media (no matter what kind) do have a high error rate...
> MO media do not.
Actually, MO can without write-after-verify correction.
But yes, I oversimplified by referring to everything as MO.
Sorry about that.
> The biggest customer for those is the US government...
> it is common for a MO disk to have a 40+ year warrenty.
Typical expected lifetime is 30+ years, although that assumes you have
other mitigating features (e.g., cartridge).
DVD-RAM is just the DVD Consortium's standard for rewritable.
It was introduced early on because it was inexpensive, and created a
real standard for optical archiving in a sea of proprietary MO formats.
DVD-RW was more of a consumer answer to DVD+RW.
BTW, from my understanding, DVD+R is more of a WORM implementation of
DVD+RW, than a single groove record like CD-R and DVD-R.
--
Bryan J. Smith b.j.smith@xxxxxxxx http://thebs413.blogspot.com
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