Does TM backup external drives?

I have an external 30GB USB2/Firewire drive that I store my work files on. I also have an external USB2 200GB drive that is set up for TM only.
The 30GB external drive does not get backed up when is is connected via Firewire.
Can TM back up an external drive? If so, how?

"Open the TM preference pane and click on the Change Disk button. All the drives listed can be backed up by TM unless you put it in the Excluded list (access through the Options button.)"
Drive is visible in the TM prefs pane and is not on the excluded list.
But it is not being backed up by TM.
Going back in TM and the drive is greyed out and not selectable.
How do I get it on the back up list?
What I think I noticed was that when this drive was connected as a USB2, it was backed up. However, now that I am using the Firewire connection it is not.

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