burning x-box games
 

is it possible to burn x-box games using multiple cd-r's or cd-rw's, and actually play them on a mod-chipped x-box

a single game on multiple cd-rs? Not really. Only one that i've seen work was halo. 1 disc for muliplayer, the other for single.

If you wrote specific software to chop those games down its technically possible. You'd still have the problem that most Xboxes hate CDRs though.