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Posted by Jay G. on 06/15/06 02:37
On Wed, 14 Jun 2006 05:15:18 GMT, Roy L. Fuchs wrote:
> On Tue, 13 Jun 2006 20:39:19 -0500, "Jay G." <Jay@tmbg.org> Gave us:
>
>>
>>You seriously believe that DVD and CD have identical manufacturing because
>>they're the same diameter? Besides the ignorance displayed in that
>>statement about manufacturing, Blu-Ray is the same disc size.
>>
>
> CD and single layer DVD can be stamped on the same gear. The only
> difference is the master.
No, you're wrong.
http://arstechnica.com/news.ars/post/20050927-5355.html
"Converting existing DVD manufacturing plants to HD DVD is far
cheaper than setting up for Blu-ray."
http://reviews.cnet.com/4520-8900_7-5600201-1.html
"HD-DVDs carry the same basic structure as current DVDs, so converting
existing DVD manufacturing lines into HD-DVD lines is supposedly simple
and cost effective."
So it's not the exact same gear, although they're similar, which means
manufacturers can convert existing gear to HD DVD.
> BluRay is multi-layer out of the box which is like asking for
> problems.
What? Blu-Ray has a single layer format.
> Why do you think the number of four layer DVDs is so low?
"Four layer DVDs"? Do you mean a dual-sided/dual-layer disc, or in other
words DVD-18?
DVD-18s aren't popular partly because of the low yield, partly because the
cost difference between two DVD-9s and one DVD-18 doesn't make it worth the
trouble most times, and that consumers, it turns out, would rather have two
discs than a disc with two sides they can't touch.
Incidentally, hybrid HD DVDs uses tech similar to that for DVD-18s:
http://www.manifest-tech.com/media_dvd/dvd_hd_multi_layer.htm
> Could it be "Prime Pass Yield"? Another term you'll have to look up.
I tried, but can't. Google literally comes up with zero hits for the
phrase "Prime Pass Yield". Wiki comes up with nada as well. It's like you
just made it up.
DVD faq mentions the lower yield for DVD-18s
http://www.dvddemystified.com/dvdfaq.html#3.3.1
-Jay
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