You can also burn a CD via the command line. First, make your image file, if necessary, which I'll call "my_image.img" by running the following command. Note that "/home/user/whatever" is a dummy value, you will need to substitute the real name
mkisofs -r -o my_image.img /home/user/whatever
Burn it to CD by running this command:
cdrecord -v speed=8 dev=0,0,0 -data my_image.img
Of course, you would want to adjust the speed parameter to match your equipment. Personally I would not run at the max speed of your CD, the chances of burning coasters increases dramatically. Burning is a one time deal, and burning at 8X or 16X is not really an issue. Have fun -- J.W.