Originally Posted by wnorris
This is really sad. You are trying to spread FUD and you don't even know what you are talking about. Why don't you just make stuff up the next time to make it easier on yourself.
Yes, this article and presentation does say that HD DVD has better region coding technology than DVD, despite it not being used yet. That's about all you guess right.
What this is saying is that Twin discs are supposed to be able to play in both HD DVD players and standard DVD players, despite all the layers being on one side of the disc. So pop any twin disc into almost any player in the world, and it should play.
What is being questioned is can you use a mix of DVD Region Coding and HD DVD region coding, or otherwise, is it possible to have one Region Code (AACS based) for the HD content, and a seperate region code (CSS based) for the DVD content? This is being investigated.
I personally say make everything region free and lets all live in one world.
The next part, which you so ineptly try to spin as "There you have it, the 2 HD DVD layers in a HD DVD TL Twin disc is not compatible with current HD DVD players while the DVD layer is readable." is entirely wrong. Do you even know what the BCA is. Here is a nickle crash course:
"According to the physical DVD specification, a Burst Cutting Area (BCA) is a feature that provides support for a bar code to be written inside of the lead-in area of replicated DVDs. This allows for discs to be given unique codes, which can come in handy as a form of copy protection in circumstances. This feature is rarely used and support for reading BCA is not mandatory."
The BCA was used by DIVX to ID individual discs. What is being questioned is if a BCA can be included on a HD DVD. Basically they can, but it appears that you can't have a seperate BCA for the HD and SD layers. The second BCA is unreadable (not clear if it is unreadable by current DVD, current HD, or both). Big whop and a far cry from what you claim.
As for spherical aberration, it simply means:
"A perfect lens focuses all incoming rays to a point on the optic axis. A real lens with spherical surfaces suffers from spherical aberration: it focuses rays more tightly if they enter it far from the optic axis than if they enter closer to the axis. It therefore does not produce a perfect focal point."
Spherical aberration revision simply means they must correct the focus of the lens to minimize/eliminate abberration. To read three layers, they need to have a drive that can refocus. Or if it can't refocus, they need a drive that can perform correction on the data stream to compensate. This kind of compensation can be achieved through PRML and ETM. In HD DVD whitepapers going back to 2004, Toshiba stated the need for their drives to be PRML drives for HD DVD. To the best of my knowledge, every Toshiba since the A1 has had a PRML equipped drive installed (don't know about the 360 add on), meaning all generations of technology already have this drive. I think the questions being raised are, will DVD drives need PRML to read the SD layer? How many DVD drives already have the technology? PRML DVD drives have been around since 2004, but how many make it into DVD players? What about the cheapo $29 DVD player? Did they skimp on PRML?
KL, I nominate you for the most FUD tastic post I think I've ever seen on AVS. You took something in a language you don't even understand, ran it through a translater that is known to give garbled up translations, and then spun the grabled translation to basically say it is a presentation by the DVD forum on why triple layer discs are a total failure.