blaydcor said:
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Actually there has been some debate over this. Not in relation to this game. Rage developer Carmack said that they would use as few discs for rage as possible. A natural reason ofcourse, would be because it breaks up the game.. However ! A different reason was given. He said that royalty fees increased a lot when you used multiple discs. (atleast if you use 3+)
I'm not sure if it's the same for rpg games but it's a viable concern. It wouldn't affect microsoft published games since they don't have to pay royalty.
Anyways you can read for yourself here:
"id's post-apocalyptic open-world shooter Rage (PC, PS3, 360, Mac) will look worse on Xbox 360 due to the compression needed to fit the game's assets on two DVDs, programmer John Carmack revealed at tonight's QuakeCon keynote.
According to Carmack, the royalty fees to include a third disc in the Xbox 360 version would be so high that it simply isn't a feasible solution, with the programmer hoping for Microsoft to make a concession. He stressed that the issue is merely a storage problem and has nothing to do with the power of the Xbox 360 hardware, while adding that the PlayStation 3's Blu-ray format is Sony's one leg up on the competition."
http://www.shacknews.com/onearticle.x/53976
EDIT: for your first sentence. Well it depends on how many extra assets they would need and if they would have to be placed on all discs or only one.