Post your DISC quality scans here 2 [page 4/179]

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JoeRyan

Senior Member

17. August 2007 @ 05:29

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I've talked to Nero engineers about why some people do not like the software's handling of DL media. They claim there is nothing wrong with the way it works, but some people like the ability to choose where the layer break occurs instead of having the software automatically choose it. (Both L0 and L1 must have identical data sizes. Simply breaking the video data in half means that sometimes the break can come in the middle of a critical scene, and the slight pause will be irritating. Movie mastering engineers try to alter the compresssion schemes so that the break comes during a change in the scenes and is less noticeable. Some recording software also allows that. Nero doesn't.

I think that most of the problems lie with the drives and their match with the media. A DL disc that has a poor second layer on one drive can have a much better performance if recorded on a different drive. That suggests to me that the drive has more influence than the medium. Supporting evidence is that older DL drives still produce "unbalanced" DL recordings with one layer or the other having a much greater level of PIE errors than the other. A newer drive using those same discs typically shows better results. The only thing that changed was the drive and its firmware.

Where discs had their biggest problem in manufacturing was in trapping bubbles when the outer layer was applied to the inner layer or leaving debris when the photopolymer stamper was removed from the disc. It took Verbatim nearly a year to figure out how to resolve these problems, and they had a big advantage when they introduced DL media. Everyone else had to play catch up, and the bubbles where a big problem. Vacuum chambers were one expensive solution. Finally, Ricoh took a gamble on eliminating the photopolymer stamper that created debris and was tossed out and using an upside-down or "inverse" stack method of making DL media. The good news is that this method improves yield and reduces costs substantially. The bad news is that IS DL media have to be restricted to newer 8X discs because the older drives have trouble recording them unless their firmware is changed--and how many drive manufacturers can afford to have engineers support 3-year old drives when a new one costs only $40?

I think that DL media will become much less expensive with the expansion of IS manufacturing later this year. Buying a new drive will not only allow recording on these new media but will also show better results on 2.4X/4X and DVD-R DL discs. It's a matter of buying a new drive for $40 or continuing to pay $150 for drives and have our older ones supported beyond 6 months. The consumer appears to prefer cheaper new drives than long-term support of older models.


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