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Save the file and quite quit the editor. To see if that will work at boot time, try with:
mount -a
If that gives you errors, there is a good chance that this line was not added properly and your machine may not reboot and get stuck mounting the drives!
Note that the hda-dismount diskmount command had already added lines to mount my OS drive which had two partitions (root or /, and home). Save file and close.
4) Save file and reboot machine.