I bought a new external hard drive for backups, but time machine won't do a full back up.  I think it is remembering backing up onto previous external hard drives, which I don't own anymore.  How do I do a new full backup?

I bought a new external hard drive for backups, but time machine won't do a full back up. 
I think it is remembering backing up onto previous external hard drives, which I don't own anymore.  How do I do a new full backup?
When I bought the new (used) iMac, I also bought an external hard drive for backups.  It worked fine, but my husband stole it.
Then I bought a new external hard drive (Seagate) and it worked fine for three weeks, then died.
So I just got a new external hard drive, which was put together from an internal hard drive and a hard drive enclosure. 
Time machine did the first backup today, and it should have taken 9 hours like it did on the previous first time full back up.  Instead, it took 30 minutes.  That can't be right.  I want to start over and do a full backup to make sure everything gets onto my new external hard drive, but I can't figure out how to do that.  Please help.

Triple-click anywhere in the line below to select it:
tmutil compare -E
Copy the selected text to the Clipboard (command-C).
Launch the Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window (command-V).
The command will take at least a few minutes to run. Eventually some lines of output will appear below what you entered.
Each line that begins with a plus sign (“+”) represents a file that has been added to the source volume since the last snapshot was taken. These files have not been backed up yet.
Each line that begins with an exclamation point (“!”) represents a file that has changed on the source volume. These files have been backed up, but not in their present state.
Each line that begins with a minus sign (“-“) represents a file that has been removed from the source volume.
At the end of the output, you’ll get some lines like the following:
Added:
Removed:
Changed:
These lines show the total amount of data added, removed, or changed on the source(s) since the last snapshot.

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