Erasing the drive should have done it, as all data and indexes for TM should have been wiped.
arrectly (GUID, Journaled)? Where are you seeing the message and what is it exactly?
Fishrrman's "oh, no, there he goes again!" advice:
Forget Time Machine.
Try either CarbonCopyCloner or SuperDuper instead.
Both have 30 day trials, trying them costs you nothing.
If you don't like the cloned backup, just erase it and go back to TM.
But I'll reckon that if you try it, you'll like it...!