dual boot on c't desinfect 2013 stick?

[Rava]

How to load/run porteus from a USB stick that already has c't 's desinfect 2013 on it?

It formatted the USB stick into 3 partitions: the first two being vfat, the last being ext4, and loads by using grub2...

Porteus would fit on any of these partitions.
The ext4 sure is good for the rootcopy folder.

here is its original grub config file:

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if loadfont /boot/grub/font.pf2 ; then
	insmod efi_gop
	insmod efi_uga
fi

set menu_color_normal=white/black
set menu_color_highlight=black/light-gray
set default=0

menuentry "Desinfec't 2013 starten" {
	linux	/casper/vmlinuz file=/cdrom/preseed/ubuntu.seed boot=casper persistent quiet splash memtest=4 -- debian-installer/language=de console-setup/layoutcode?=de
	initrd	/casper/initrd.lz
}

[tome]

Change:

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set default=0

to

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set timeout=5
set default=0

You can change 0 and timeout value (0 - the first menuentry will be loaded if no key pressed within 5 seconds)

Add at the end:

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menuentry "Porteus my" {
search --no-floppy  --file --set=root /......./boot/syslinux/vmlinuz
linux /....../boot/syslinux/vmlinuz   your-chatcodes
initrd /...../boot/syslinux/initrd.xz
}

Replace ........ with your own path - omit /mnt/sdxY, C:, (hd0,1) and similar
You can also use --fs-uuid instead of --file but add then your UUID.
If your chatcode contains = (from, load) then add ' after = and ' at last, ie

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load='my;test'

For noload= you need probably additional semicolons ie:

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noload=';my;test;'