help asap with sno cross

ok, i downloaded sno cross and dave mira, they are the same format, both have multiple mucis tracks. i use cd2nero to convert,.. ok, my cdi image is 690 mb. when i convert to nrg. it still says the same, but if i hit burn image, it only says its about 50 mins. worth of the cd. my prob is how do i burn with the extracted music tracks, cause it says it has about 800+mbs.
thankx in advance for any help