The point is, after all, to see whether disc A is "better" than disc B in any given drive.
Assuming that I'm interpreting the above correctly:
- The aim is to use a single consumer drive to test whether a disc A is better or worse (relatively) than disc B AND to get a result that is applicable to ANY drive.
I must say that it is not possible to my knowledge based on the literature on DVD player implementation and dvd quality testing that I've been able to read.
I and others have shown with test from up to 6 different chipsets/OPU/transport combinations that disc A can be better in drive X and disc B can be better in drive Y.
Which one is better?
The reason for this, as I've so many times written here, at CDFreaks and at CDRInfo, is due to the variation of the implementation of reading of data (esp. management of data-to-clock jitter) in drives.
There is NO single right way to optimize dvd disc reading in a drive (much less so than for cd discs, for which there exists an idealized reference).
Due to the lack of this standard, manufacturers are free to implement their own way of optimizing the reading process.
This has resulted (and will result in the future) in reading capabilities that differ in their ability to react to different kinds of anomalies on different types of discs.
That is, discs will not measure even relatively the same across drives (resulting in same ordinal sequency of disc quality).
And I do agree that using a drive that is more capable than most in a certain way skews the results even more, unless that particular drive holds 50-90% of the market share of drives (and no single drive does, not even one single mfg does afaik).
So reliable and useful testing for more universal compatibiliy estimation should always be done with several different drives and combining the results statistically.
I wish we could just put this issue to rest already.
Neither LiteOn, Plextor or any other single drive is sufficient for doing universal compatibility/media testing.
- DVD Players and Drives, K.F. Ibrahim, Newnes, 2003
- DVD Testing, S. Gerger, ODS Mag, 6-7/1998