Problem with daisy chaining HDDs and Time Machine

I have purchased 2 WD My Passport Studio FireWire 2TB HDDs which I have daisy chained to my MacBook Pro. One I have assigned to be the Time Machine backup the other as an additional data drive. Both are formatted for Mac OS Extended (Journaled). I setup Time Machine to backup both the internal and external drive. When I set it up everything looked OK in Time Machine Preferences, but the daisy chained data drive displayed on the desktop with the Time Machine backup logo and the backup drive displayed as a standard FireWire data drive. However the backup worked successfully and backed everything up to the correct backup drive.
I have since established the following:
1. If both drives are daisy chained and then plugged in, the data drive shows up with the backup icon and the backup drive shows as a data drive, but Time Machine backs up to the correct drive. This is the case regardless of what order the drives are daisy chained.
2. If the backup drive is plugged in on its own it shows up correctly with the backup drive icon. If the data drive is then daisy chained to the backup drive both drives show up as backup drives. Time Machine backs up to the correct backup drive.
3. If the data drive is plugged in on its own it shows up incorrectly as the backup drive. If the backup drive is then daisy chained to the data drive the backup drive shows as a normal FireWire data drive. But Time Machine still backs up to the correct drive. Exactly the same as case 1 but the drives have been daisy chained after connecting to the MacBook Pro and the result is the same.
4. However if the data drive is plugged in on its own, showing up as the backup drive, Time Machine backs up to the data drive incorrectly.
The first three points are just annoying as the drive icons do not display correctly, although it does indicate to me that Time Machine is confused. But what I don't like is the fact that I can't just use the external data drive without the backup drive being present.
How do I overcome this problem?

Launch Disk Utility and select one of the volumes in question. Click the Info button in the toolbar. In the Information window that opens, note the Universal Unique Identifier. Do the same with the other volume. Are the identifiers the same?

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