use mkisofs to create a bootable iso

hi all,
i am making a multiboot cd to have as a sys rescue cd (super grub disk system rescue cd and clonezilla) i have edited sgd’s menu.lst to be able to boot all 3 but when i do mkisofs -l system\ rescue\ disk\ >myiso.iso i get a lot of filename to long and when i run it with qemu it says thene is o MBR to boot from
can anyone help m create a iso for this ?

Have you checked: man mkisofs

There are gui apps like isomaster or AcetoneISO to help make up .iso’s