the most you can get free is 14-15 gigs. the rest is preloaded software that actually runs the system and some of the space is kept for temporary files so it loads the games faster. its the same shit when you buy a computer or hard drive, it says 120 gigs but you only get 115 or whatever. i bought a 500 gig hard drive and it only came with 486. also it keeps the system updates and backwards compatiable stuff on it too.