They have it's called DVD, they have even replaced that with Blu-Ray..
I'm sorry I could not resist
rAge has the large installs and multi disks due to the mega textures they using. Microsoft recently released a new update for the 360 that allows the current DVD 9 disks to carry up to an additional 1 gig of data.
But yes you are right it seems that more and more games will start using multiple disks on the 360. Can't say I'm phased by it though.





