Convert ext2 to ext3
If you have installed Arch to an ext2 filesystem, it is a good idea to enable the journal and turn it into an ext3 filesystem. Journalling provides a range of benefits.
All you need is the command:
tune2fs -j DRIVE
Where DRIVE is /dev/discs/disc0/part1 or /dev/hda1 for example.
Note that once you have done that you then need to edit fstab accordingly and change
ext3 for the partition's filesystem.