Three discs will demand 18.3GB of space should you opt for it. Final Fantasy XIII releases March 9th in the US and EU for Xbox 360 and PS3.
The report comes from, who points out the obvious bad news for Xbox 360 Arcade owners. While technically it should fit on a 20GB, it won't because of needed cache space (6GB) for the console to function.
Disc 1: 5.9GB Disc 2: 5.8GB Disc 3: 6.6GB
Disc 2: 5.8GB
Disc 3: 6.6GB
Final Fantasy XIII releases for both Xbox 360 and PS3 here in the West. Are you one to install Xbox 360 titles to spare yourself noisy disc drives, or preserve games?