Time Machine backup disk - accidentally selected Do Not Use

I had an issue I was trying to correct- I selected the backup volume, to which I had previously backed up to, and choose "Do Not Use."
Now, when I choose the "browse other backups" option from the Time Machine menu, it does not show the original back up volume at all.
I deleted the Time Machine plist file - but, the volume is still not showing up. It is a TM volume - etc.
Does anyone know where that excluded volume information may be stored?

SOLVED:
I tried a number of things based on various posts. This is what worked for me:
On the iMac with the attached TM volume:
Added the Time Machine volume as a shared folder in System Preferences - Sharing
Changed permissions for Everyone to Read/Write - I think this would have worked by itself
On the Macbook Air (whose drive I back up):
Mounted the Time Machine via the Finder prior to attempting to select it (Note: I did not force mounting via “Connect to Server” - although I can)
Selected the Time Machine volume from the TM preferences pane
Backup is working very well - and very fast. What I don’t know how to determine - which protocol is being used between the Air and iMac. It may be the new SMB version - it is unusually fast.
Setup:
TM Volume is on a new iMac running Mavericks 10.9.1
On the iMac - File Sharing is turned on in System Prefs
The iMac Sharing Options only has AFP checked - SMB is not checked - however, it shows one user connected - and one is connected under AFP
The TM Volume is on on an attached Firewire Seagate 3 TB drive - connected via a Thunderbolt firewire adapter - and is daisy changed - it is the second drive - the first is a Seagate too
The iMac host is connected via Ethernet to a central router
The Mac Air is connected via Wifi to an Airport Extreme - which is connected to the central router
The Mac Air is running 10.9.1
Prior to the TM volume not showing up - this setup worked, at least once, after I updated both systems to 10.9.1
What had no impact on the solution:
Changing the iMac Computer Name to pure alphanumeric - no spaces - no special characters, etc.
Mounting the TM Volume via Connect to Server
The TM volume was already formatted per requirements - no changes made

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MattLat wrote:
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John Seal wrote:
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