apt-get install gdisk sgdisk --zap-all /dev/sdb sgdisk --new=1:0:0 --typecode=1:ef00 /dev/sdb mkfs.vfat -F32 -n GRUB2EFI /dev/sdb1 mount -t vfat /dev/sdb1 /mnt -o uid=1000,gid=1000,umask=022 * copy files + bootia32.efi rsync -auv /home/ghusson/Téléchargements/loopmount/ /mnt * debian : .disk grub-install --removable --boot-directory=/mnt/boot --efi-directory=/mnt/efi/boot/ /dev/sdb