In an interview with Eurogamer, id Software Creative Director, Tim Willits confirmed that their FPS, Rage will come on 3 discs for the Xbox 360 and on one disc on the PS3, with the PS3 version requiring an 8GB install.
For the Xbox 360 version, two of the discs will contain the story mode of Rage, while the third will contain the multiplayer portion of the game. Tim recommends installing them on the hard drive, but if you are tight on space, after you play through the first half of the game, you can uninstall the first disc and install the second disc for the second half.
Tim also praised Sony for allowing them to do an install on the PS3 hard drive because it allowed them to install the textures to the highest degree and making the process easier to handle.
Rage is set to release on October 4 in the US and on October 7 in Europe and UK.