How do I restore grub Arch?

This is what I usually do:

1. Boot from a Arch ISO (CD/USB).
2. mount the partition.
3. arch-chroot into the partition.
4. configure network (if necessary)
5. make sure the packages grub and os-prober are installed: pacman -Sy grub os-prober (will need network)
6. go to the /boot/grub directory.
7. grub-mkconfig > grub.

How do I reinstall grub bootloader?

Reinstall the GRUB boot loader by following these steps:

1. Place your SLES/SLED 10 CD 1 or DVD in the drive and boot up to the CD or DVD. …
2. Enter the command “fdisk -l”. …
3. Enter the command “mount /dev/sda2 /mnt”. …
4. Enter the command “grub-install –root-directory=/mnt /dev/sda”.