This is a nifty little app that splits files into many segments. Its multi platform and free! HJSplit can split a large file, ex 10 gigs to 640 mb parts to be burned onto cd. Afterwards, HJSplit or HJJoin can combine them with a compare and checksum check. Very nice. Get it here
and never have to worry about over burning an 6 gig img onto a 4 gig dvd like i once tried. :P