source: http://forum.eeeuser.com/viewtopic.php?id=18715

ext2 => ext3 (can be done while mounted):
tune2fs -c 0 -i 30 -j /dev/sda1

ext3 => ext2 (need to boot from another source, like a usb flash drive)

umount /dev/sda1
/sbin/tune2fs -O ^has_journal /dev/sda1
/sbin/e2fsck -y /dev/sda1
mount -t ext2 /dev/sda1 /mount/point
rm -f .journal

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