Multi-CD USB stick

Well I'm not sure the title speaks for itself...
Live CDs are great and USB sticks have amazing capacities (I'm curious how it'll sound in a couple of years...)
I've bought a 6Gb USB "stick", actually it's a HD in a credit-card format.
The idea is to bring on it and be able to boot:

• Knoppix DVD v5.1.1
  • and memtest
  • and DOS (from balder.img) That one fails on my laptop :-(
• FCCU CD v11.0
• DBAN v1.0.7
• Etch installer from boot.img.gz

So I use a single syslinux with a huge configuration file.
Sometimes there are some clashes between the files of the various systems so we've to rename some when possible and choose between some when not possible.

• syslinux.cfg and isolinux.cfg => merge all and rename some of the targets if needed
• boot.* => choose one image (I took the Debian spiral from Etch installer) and one text (I list shortly the main targets)
• F1..F10 help screens => choose or mix

From Etch: this is really the basis of the install, with its syslinux

• debian-testing-i386-netinst.iso renamed as: debian.iso
• disk.lbl
• f1.txt .. f10.txt
• initrd26.gz
• initrdg.gz
• initrd.gz
• ldlinux.sys (install it properly as a bootable USB stick!)
• linux
• linux26
• splash.rle

From DBAN (dban-1.0.7_i386.ima):

• dbanlog
• dbanseed
• *.txt => dbaninfo/
• initrd.gz renamed as: initrddb.gz
• kernel.bzi

From Knoppix DVD:

• knoppix/
• balder.img
• linux renamed as: linux-kn
• memtest
• minirt.gz

From FCCU:

• knoppix/ renamed as: fccu/
• linux renamed as: lin-fccu
• minirt.gz renamed as: minifccu.gz (cf note)

Note: For FCCU as we had to rename the directory and as v11 is incompatible with knoppix dvd v5.1.1 I had to change minifccu.gz:

gunzip minifccu.gz
mount -o loop minifccu /mnt/disk

Edit /mnt/disk/linuxrc and prepend the module list by the new path: (but keep the rest!)

MODULE_DIRS="/cdrom/fccu/modules /cdrom/KNOPPIX/modules ...