Firewire 800 2 External Hard Drives, 1 w/800, other w/400

Backstory:
My current External Hard Drive has both USB & Firewire 400. I've just purchased another, larger, that has both 400 & 800. The original I'll call the 400 is set w/Time Machine. I'd like to switch that to the new 1, "800", but still keep the old connected as a secondary back up device for specific items.
All that being said, how do I go about doing this?
With the 400 already installed on my computer, it IS visible on my Desktop as it should be. When I attempted to start the new 1, 800, it does not show.
Due note, I was unaware only 1 firewire item shows at a time. Should I be concerned about my computer, or is this common? Both show properly in my "System Profiler", but ONLY 1 AT A TIME.

Strange. I have seen posts claiming certain Macs don't recognize 2 firewire ports at the same time.
That is nonsense. I have two FireWire drive connected to two separate ports. Please provide a link to such a post.
When I unmounted my 400 (old), then it showed in the profiler, but still not on the desktop.
If the 800 drive's volume does not mount when the other drive is disconnected, there is something wrong with the drive.
Connect the 800 drive by itself (no 400 drive connected). Run Disk Utility. Does the drive show up in the sidebar? If so, is there a volume indented under the drive in the sidebar? If not, you may need to go to the Erase tab (or Partition tab) and format the drive. If there is an existing volume, select it in the sidebar and click the Mount button in the toolbar.
So the first step is getting the 800 drive to be recognized properly by itself.

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