Time Machine Shows Duplicated Drives and May Not Backup

I have a Time Capsule with a Western Digital My Studio Drive attached by USB. Often it works well, but sometimes it appears to see a duplicated WD Drive with no backup on it, and fails.
The most obvious symptom is (and I wish I could attach a jpeg!) if you open the 'Select Disk' dialog, you see the following disks listed:
HA Time Machine WD Drive
home
net
HA Time Machine WD Drive
HA Time Capsule
HA Time Capsule
None
Where home and net are from, I have no idea. But you can see the duplication. And that can lead to error.
I have tried selecting 'none' and starting again, I still get this extended list. I have tried setting up the Time Capsule from scratch to no avail. Obviously I have rebooted!
Any answers?

Knitbuyer:
Welcome to the forum. You said that you have a 2GB USB Drive attached. I am assuming that is one of those Jump/Flash drives. If that is the case then they cannot be used as a backup device for TM. First, 2GB is too small to act as a back up for a HD that an average user has is over 50GB to back up. Second, try and connect an external HD USB/Firewire and it will show up in TM preferences.
Axel F.

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