At Eurogamer Expo, the creative director for Rage confirmed that the game will release on three discs for the Xbox 360, and require an 8GB install for PS3 owners.
The three-disc release wasn't exactly a surprise. At QuakeCon, Joel reported that the game would require 21-22GB of hard drive space if you installed it to your 360. That hinted at a multidisc form for sure. The 8GB installation on the PS3 had been rumoured. id's Tim Willits confirmed it for Eurogamer's Digital Foundry, and complimented Sony for its help in managing the installation and permitting one of that size.
"Sony was great. Kudos to Sony for letting us do that," Willits said. "They don't allow every game to do that. So definitely, hats off. What we were able to do is install all the textures to the highest level."
Willits said that while id Software recommends installing the game to the hard drive on the 360, "you don't need to install all three discs. If you don't have the space available on your hard drive, don't stress. Install the first disc, the first chapter, the first half of the game, then when you're done, uninstall and install disc two."
Asked to explain what that meant, Willits said: "You can go back if you want to but there's really no reason to." Also: "You don't really need to install the multiplayer disc if you're really tight on hard disk space."
Rage: The Return of id Software [Eurogamer — h/t LulzJager]