At Eurogamer Expo, the creative director for Rage confirmed that the game will release on three discs for the Xbox 360, and for PS3 owners, require an 8 GB install.
The three-disc release wasn't exactly a surprise. At QuakeCon, Joel reported that the game would require 21 to 22 GB of hard drive space if you installed it to your 360. That hinted at a multidisc form for sure. The 8 GB installation on the PS3 had been rumored. 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.