Time Machine Change Disk - Getting original backups

I wanted to look at another disk which I had been using for backup before getting a Time Machine. When I switched back, I answered too many questions and ended up disconnecting the Time Machine and did a reboot.
When I finally reconnected to the Time Machine (and the internet), I found out I am doing a full backup and the original backups.backupdb does not show up on this Time Machine, even though the space is claimed.
What do I need to do to start backing up only the changed disks to the original backups.backupdb?
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Juan Terrazas1 wrote:
What I wonder is if I delete the TM plist then where is TM Preferences reading its information?
No, the only place that's kept is in plist in the /Library folder at the top level of the drive.
Sometimes there's a file with the same name in a user library, but it doesn't have that info. That's why it looks like either the file didn't get deleted, or the wrong one was deleted, or System Preferences was still running, with the info in memory.
Is there another plist file that I should delete?
No.
But let's be clear; do you mean the disk is still shown as your Time Machine drive on the Preferences panel (after Name):
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or that it shows up in the list of items you can select when you click +Select Disk:+
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