Could Ms created its own disk with bigger size then 9 gigs???

Would it be possible/smart for MS to creat its own disk format(kind of like gamecube disk) for games. Not using dvd,hd dvd, or blu-ray formant but have a add-on for those movies?

of course they could, althout creating a whole new type of media for a video game hasnt worked out so well so far (gamecube and psp are clear examples)

 in any case the current xbox360 would not be able to read a new type of disk; we would have to wait for the next xbox

It would be VERY interesting however, if ms decides to make some games hd-dvd, so you would need the hd-dvd player to play them (blue dragon for example, 1 hd-dvd or several dvds: being able to chose would be nice). Im not even sure if thats possible with the current hd-dvd player, but it certainly would be nice