I never burned a DVD DL before, but i have a .dmg thats 6gb and needs to be burned. after i selected the .dmg and pressed burn in disk utility but the software wouldn't allow me to burn the file. i got a message saying not enough space in the disk. but i know there is, its a blank dl disk. i get the feeling it didn't recognize the dvd as a dual layer dvd. what do i do, so that disk utility can burn the file.