The 360 would be able to do double layer DVD and get 9Gb in a game.
Blu-ray single layer is 25Gb or 50Gb dual - both use compression it's essential to faster load times.
The Ps3 can use it's HDD to buffer data from the optical drive for faster random access (the 360 cant as it's not standard).
Keep in mind only a total of .5Gb RAM in either machine , means that to use all that data it has to be streamed through gradually, only 1/50th of a single layer blu-ray disk can be in memory at one time.
The ratio of real memory to Optical storage has improved though we have ~10* more RAM, while the blu-ray disk is ~6* larger than dvd.
Some type of games will never need more than a CD or DVD while those with many levels may well need 25Gb or even 50Gb will be interesting to see it.
On PS2 - in SSX tricky for example they had On disk interviews with all the actors in the game , so if developers wanted to they can include the making of and so as extras or even talk about design etc - most movies these have have this sort of extra material why not games too i for one find this sort of thing quite interesting even though it has no direct impact on the gameplay.
PS3 number 1 fan
