[charlie_ps2]

Then I'm sorry for your problem, but the answer to the yellow/blue question is in my post and in English!

Basically the post says that from the point of view of burning speed, the yellow/green ones burn the best at higher speed (4x on cheap burners, 8x on best burners). The blue ones require a slower speed of 1x or 2x for best results on a good burner.

The quality of the disk is the protective layer. I should say that the disk is most vulnerable at the top where there is little material between the label and the data layer.