mine has 120gb hd, and it holds apporx. 50 odd games + divx.
If you want good racing games (realistic) try Sega GT, u get GTRs, supras etc and can mod em, very similar to GT3, aslo try Mercedes World Racing, this game sounds shit but is awesome once cracked, u get all the Mercs imaginable all the AMGS, u can turn off traction control and cut the loudest, smokiest and longest nuts than any other game on the market, the handling is realistic as and the levels are massive, V8 race driver is mint too