I have had to repair grub2 four times in two days. I am wondering if it a problem for everyone or just me? I realized swapping drives caused the first one but the other three I'm confused about.

I powered on the computer.

Welcome to GRUB!
Error: Unknown Filesystem
grub rescue>

I am able to repair it with:

Run Live Cd open Terminal
Replace Y & Z with your hd.
If you are unsure use Gparted to find out your hd info.

Code:
mount /dev/sdYZ /mnt
mount --bind /dev /mnt/dev
mount --bind /dev/pts /mnt/dev/pts
mount --bind /proc /mnt/proc
mount --bind /sys /mnt/sys
chroot /mnt
grub-install /dev/sdY
update-grub
exit
umount /mnt/dev/pts
umount /mnt/dev
umount /mnt/proc
umount /mnt/sys
umount /mnt
Any Idea?