As far as I know, you have to recompile the kernel to get Joliet to be accepted. You should do ls -la /boot to see if you have .config or config or something like it.
If you do, then cat /boot/.config | less | grep JOLIET (I think this works...or just look through everything... cat /usr/src/.config | less).
See if Joliet is compiled into the kernel. Joliet is under filesystems in the .config file, I think.
Well, good luck.