當然先要  fdisk 一下 /dev/sdb

#### make boot USB
mke2fs -j -L /boot /dev/sdb1
mount /dev/sdb1 /mnt/tmp/boot/
cd /mnt/tmp/boot/
cp -a ~tjm/boot/service/* .
sync
grub-install –recheck –root-directory=/mnt/tmp /dev/sdb
cd ..
umount /dev/sdb1