can someone explain how to burn cdi!!!!!

i just got finished downloading my first dc game... "Marvel vs. Capcom2", extracted with winrar and became a cdi file"720mb" got on discjuggler ####ted to burn it like my "utopia cd loader"(which worked just fine) and after a couple of min. it spit out the cd with only a extreamly small proption used...?! asking for another cd! i figured it was becuase i was using a 700mb cd, but i've seen people fit a full game in one... so is there somthing i must do to make the game smaller or to add any other files to reduce the file size, or do i just have to buy a bigger size cd..?... will some please drop their two cents and help me out...thank you

AIM: emceefree78 or BaRCoDe2884 should be on both