The output of mkisofs can be fed directly into cdrecord if the CPU is fast enough (better than 400MHz). Note that the default installation requires cdrecord to be run as root.

The first step is to determine the image size:

# IMG_SIZE=$(mkisofs -R -q -print-size /home 2>&1 | sed -e "s/.* = //") # echo $IMG_SIZE

Then write the data CD:

  # [ "0$IMG_SIZE" -ne 0 ] &&
  $ mkisofs -r /home |
  $ cdrecord speed=8 dev=0,1,0 tsize=${IMG_SIZE}s -data -