sometimes you have to accept that things just don't make sense and they are the way they are.

i nearly had bought the game but nah...

But you don't have 360, if I don't recall wrong :O

Normally cutscenes are the largest part of a game so probably the whole SP wouldn't fit in a single disc. You know those flashy (and mostly fucking annoying) effects during the cutscenes are probably the reason for a second disc :p

“Max is on 2 discs for 360, so Redbox will be renting disc 1 which contains half of the single player story and the full multiplayer game.”

http://www.vg247.com/2012/04/24/rockstar-max-payne-3-360-to-come-in-two-discs/

but the game isnt a x360 exclusive =O

But you don't have the problem of the two DVDs, right? :D

Multiplayer uses mostly same data as singleplayer. In most games over 90% of the data in multiplayer is exactly same as in singleplayer. Singleplayer and multiplayer are never separate, they always share same components. If you have same level in multiplayer and singleplayer, data is also exactly same.

For example, if singleplayer would separately be 10 G and multiplayer 4 G, whole game containing both could only be 10.5 G, not 14 G.

That means that if you had multiplayer on other disc game would have probably required three discs. Two for singleplayer and one for multiplayer.

Well, that probably clears it up then.

Eg.

SP: 12GB
MP: 5GB

 How do you fill two DVDs with that? You need to split the SP in two disc no matter how you try it... so SP and MP in separated disc is impossible.