Originally Posted by Lee Stewart
Yes . . Thank you wnorris for getting us the facts.
Well, this is just my translation. I wouldn't call them facts, as I'm not an expert translator or anything. However, my translation is vastly different from KL's interpretation of a bad machine translation.
I may be getting some of the minute details wrong, but my basic impression is that it mostly works, but there are some questions about can it do this, or what if we want to do that, etc. Trivial stuff like whether they can put two readable bar codes in the center vs one (so maybe DVD Profiler won't be able to read the disc ID automatically and add the disc to your collection).
I think the only potential serious hurdle could be with the region coding. Depending on what they discover, it could mean that a disc must choose to have region coding for either the DVD layer, or the HD layer, but not both. This may mean studios like Fox or Disney would refuse to use it because they want region coding on both.
Of course, it just means no twin disc, not no TL51 HD DVD with a seperate DVD release.
The other big issue could potentially be (in translation it isn't clear if the spherical abberation is referring to only HD DVD, or also DVD) that they learn 50% of DVD players on the market won't read twin discs because they aboslutely need PRML to correct for spherical abberation and don't have it. Then they would need to decide if they want to go forward with marketing Twin Disc at all (is it worth the hassel), or does it just change strategy (new DVD players add a PRML logo to their box, and consumers get educated that they need to buy these to play the new Twin Discs). Since spherical abberation gets worse the closer and further away you get from the focal point, it would seem layer 3 (the furthest away) would be the most effected. I think the slide that shows the change in thickness is basically saying it is possible to change the spacing on three layers so that layer 3 is much closer to where it would typically be for DVD, which may negate the need for PRML on DVD players (so one layer spacing for TL51 and a seperate spacing for 3 layer Twin Disc).
It's all still being investigated. So I will agree that nothing about triple layer is a slam dunk just yet. But nothing here points that they have concretely identified a problem.