See http://tldp.org/HOWTO/Bootdisk-HOWTO/cd-roms.html

• Copy the floppy files to $SRCDIR:

  mount -t vfat -o ro /dev/fd0 /mnt/floppy
  cd $SRCDIR
  cp -p /mnt/floppy/* .
  

• Copy the floppy image with:

  dd if=/dev/fd0 of=boot/boot.img bs=10k count=144
  

• Create CD image with:

  mkisofs -r -b boot/boot.img -c boot/boot.catalog -o ../bootcd.iso .
  

• Burn CD

Under Linux:

• Making ISO image:

  % mkisofs -R -o cdroot.iso $CDROOT
  

• Burning ISO image:

  % cdrecord -v speed=1 dev=/dev/cdwriter -data cdroot.iso
  

• Checking out ISO image:

  # mount -o loop -t iso9660 -r cdroot.iso /mnt