I am customising Knoppix 3.4 and the minirt24.gz drove me crazy I gunzip it , then mount -o loop it, modified it, then gzip it, copy it to master/boot/isolinux, then

mkisofs -pad -l -r -J -v -V "LABEL" -no-emul-boot -boot-load-size 4 -boot-info-table -b boot/isolinux/isolinux.bin -c boot/isolinux/boot.cat -hide-rr-moved -o /mnt/hda2/knx1/knoppix.iso /mnt/hda2/knx1/master

I noticed everytime i mkisofs, the isolinux.bin also changed.

When I boot from the new cd, it loaded the linux24 and minirt24 without problem, then it do the "Looking for CDROM in ..." but can't find the KNOPPIX cd so it failed.

The weird thing is, if i use the original minirt24.gz and make the cd by exactly same way, it can boot. then I put the bootable cd in a cdburner, load the original session, then add a new session, just use my new minirt24.gz and isolinux.bin to replace the original one, this time it can find the Knoppix in /dev/scd0 and boot successful, and it's using my new version minirt24.gz. ( I found my new script worked ! )