one of the the more obscure factor is the room temperature since the emission frequency of most lasers are temperature sensitive. Now this creates 2 problems.

1: is the focusing of the laser, since usually the lens of the pickup is fixed, the size of the laser spot projected on the Dye will vary with the frequency, when the laser spot is too big, you've got a problem.

2: The dyes have different sensitivities to laser power at different
light wavelengths. So the optimum recording window of a dye formulation might be missed, besides the fact that the optimum recording power changes with frequency of the laser.

OPC (Optimum Power Calibration) can solve some of these problems but not completely.

The same factor can influence the CD DA reading process.....

And of course the power-supply issue is important, even during hte playback phase.

So we've got

Media, software, Cables used, Recording setup, Reading setup, enviromental conditions, etc. as significant variables to this test.

>_<

Takuro: so where are the Datas???