I dunno, but the game is alot larger than the previous ones, with all the extra features and fitting all one one normal discs seems a bit strange though. Dual layered discs, sounds like u can get twice the amount of info on so im guessing thats what its all about..
I don't know....the GTA: San Andreas looks and feels just like any other PS2 disc I have...but I'm not sure if there's something else going on there...
I think that story is on something different, Dual-layered disks have been around for a while, thats how they can fit some long movies on a single disk