Oui je dis bien parfaite ! Et non sans raisons… Cette clé USB va vous permettre de booter : * Ultimate Boot CD * L’installeur de FreeBSD * Le live CD Ubuntu * La netinstall de Debian Enfin bref n’importe quel CD Bootable. Moi j’ai surtout mis les distrib que j’utilise le plus. Chef, la recette ! Alors petit bidouilleur en herbe, rien de bien complexe :
On se fait un beau dossier avec tout ca dedans, on créer un dossier iso, on y range ses isos à booter puis on installe le bootloader sur la clé USB. 
◎ grubinst On édite le fichier menu.lst```
# This is a sample menu.lst file. You should make some changes to it.
The old install method of booting via the stage-files has been removed.
Please install GRLDR boot strap code to MBR with the bootlace.com
utility under DOS/Win9x or Linux.
color blue/green yellow/red white/magenta white/magenta timeout 30 default /default
title Demarrer Ghost fallback 1 find –set-root /iso/ghost.iso map /ubcd.iso (0xff) || map –mem /iso/ghost.iso (0xff) map –hook chainloader (0xff) savedefault –wait=2
title Demarrer UBCD fallback 2 find –set-root /iso/ubcd411.iso map /ubcd.iso (0xff) || map –mem /iso/ubcd411.iso (0xff) map –hook chainloader (0xff) savedefault –wait=2
title FreeBSD 8.0 amd64 (boot only) fallback 3 find –set-root /iso/8.0-RELEASE-amd64-bootonly.iso map /ubcd.iso (0xff) || map –mem /iso/8.0-RELEASE-amd64-bootonly.iso (0xff) map –hook chainloader (0xff) savedefault –wait=2
title Ubuntu 10.04 alternate amd64 fallback 4 find –set-root /iso/lucid-alternate-amd64.iso map /ubcd.iso (0xff) || map –mem /iso/lucid-alternate-amd64.iso (0xff) map –hook chainloader (0xff) savedefault –wait=2
title Ubuntu 9.10 server i386 fallback 5 find –set-root /iso/ubuntu-9.10-server-i386.iso map /ubcd.iso (0xff) || map –mem /iso/ubuntu-9.10-server-i386.iso (0xff) map –hook chainloader (0xff) savedefault –wait=2
title FreeBSD 7.3 amd 64 (boot only) fallback 6 find –set-root /iso/FreeBSD-7.3-RELEASE-amd64-bootonly.iso map /ubcd.iso (0xff) || map –mem /iso/FreeBSD-7.3-RELEASE-amd64-bootonly.iso (0xff) map –hook chainloader (0xff) savedefault –wait=2
title Demarrer Debian 5 amd64 netinst fallback 7 find –set-root /iso/debian-504-amd64-netinst.iso map /ubcd.iso (0xff) || map –mem /iso/debian-504-amd64-netinst.iso (0xff) map –hook chainloader (0xff) savedefault –wait=2
title Redemarrer reboot
title Eteindre halt