I have two different Sony DVD players. I have authored many succesful DVD's using Studio 8, but have had a couple instances where a DVD I authored didn't play on the stand alone player and had a error of 13:75 or something like it show up on the screen. My newer of the two players additionally says "dirty disc" as well.

First of all, what are theses 13x errors anyways? Is there a directory/list of them somewhere? Why is this happening to brand new disks? Am I using cruddy discs? (Memorex DVD +r 4X)