you know when you blow on newer mac discs???

[puzzleguy]

It may be the imprint of a rubber gripper that feeds it into the dvd duplicator , or an imprint from when they put the screen on it for the litho ( picture ) ive seen this on stuff like tv picture tubes as well as other plastic and glass items --- Not sure if Im right , but this sounds like a pretty good guess-- Id say if the disc plays ok, why do you care ? they may of also changed the company that they buy their raw dvd blanks from--- You worry to much !