Well, all of the Prime games's cutscenes are done in-game, so there's no memory-hogging CGI cinematic sequences that take up the bulk of the space.

Plus, Prime 1 & 2 were GC games and were designed for the GC's disks which held 1.5 GB max, and Prime 3 was just about the same as the others length-wise... so if the size of each Prime game is <1.5GB on average, and the Wii utilizes standard DVDs which hold 4.7GB... even if the first 2 games maximized the GC disks (which they didn't come anywhere near to), the absolute most you're looking at is 4.5 GB, which is a perfect fit on a standard DVD.

FFXIII on the other hand will contain hours of CGI cutscenes that basically stream off the disc just like a movie does, and they require a massive ammount of memory.  Since it's being designed primarily for the PS3's Blu-Ray discs which hold much more than the 360's dual layered DVDs, they'll have to be broken up into separate discs for the 360 version.

Hope that clears things up for you.

He loves Sony...

i think its more of in Soviet Russia road forks YOU!!!!!!

"What won't be on the disc(s) for either version will be the native Japanese language track, unless you're buying the Japanese version"

I don't think japanese dub fans are going to be impressed when they find out that the japanese language track won't be included on the playstation 3 version. Kitase did say that the playstation 3 version would be able to hold another language track thanks to bluray. But not on the xbox 360 version, due to lack to space dvd offers. Kitase also said that the playstation 3 version won't be affected by the xbox 360. If so, why no japanese track? If its not because of the xbox 360, then what?