I have an external Time Machine drive that I want to reformat. I can't remember the password. How can I do this. Disk Utility won't let me. Thanks.

I have an iMac that had drive problems last winter. Took the iMac to the Apple Store and they reinstalled everything and now it works again. Only thing is that my external Time Machine drive is screwed up now. Its 1.5 TB.
I had the Time Machine drive partioned into two parts. One partion was for an emergency bootup using carbon copy cloner. That partion I can open and mounts on my desktop. The other partion was Time Machine. It once upon a time opened and mounted without a password.
It requests a password to unlock even though I never had it password protected before the iMac drive problems. And so now it won't mount the drive.
I can go to Disk Utilities and I can see Time Machine with both partions. The Carbon Copy partion is mounted. The Time Machine partion is not mounted. For this reason I can't select it and erase it.
What the heck am I supposed ot do now to erase it and start over. Any help would be appreciated. I really don't want to go and buy another drive.
Kevin

Triple-click anywhere in the line below to select it:
{ diskutil list; echo; diskutil cs list; } | open -f -a TextEdit
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).
A TextEdit window will open with the output of the command. Post the contents of that window, if any — the text, please, not a screenshot. The title of the window doesn't matter, and you don't need to post that.
If any personal information appears in the output, anonymize before posting, but don’t remove the context.

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