Backing up to new external hard drive is not working

I just purchased a new 2TB FreeAgent external hard drive. I hooked it up to use as a time machine backup and in the preferences of Time Machine it said that the drive needed to be formatted. I then went to Disk Utility and erased the drive using the format "Mac OS Extended (Journaled)" and gave it a name. Once that was done I attempted to back up again through time machine but it started the "calculating changes..." at 23% and stayed there all night. I do not know if I need to reformat it differently or why it is not working.... any suggestions?

jwsand wrote:
I tried to hook up the external hard drive to a different computer (imac) and it worked without any problem.
Did you cancel the backup it was attempting to do, before disconnecting it? If not, did you eject it first?
Do you mean it ran backups? Or just that it was recognized? Those are very different.
The mac pro has 2 internal hard drives. One for the OS and the other for a tm backup.
Be sure that second drive is now excluded from TM Backups via TM Preferences > Options. If TM is trying to back up the internal disk's TM backups onto the new external, that might explain why it's confused (I know I am!)
I attempted to hook up this external drive to a second external tm back up
Do you mean you've "daisy chained" it, to yet another disk also containing TM backups?
and noted the different disk in the tm preferences.
Do the two disks have different names, and does TM Preferences show the new name? If not, the preferences file may be corrupt. In that case, do a "full reset" per #A4 in the Troubleshooting Tip.
Do you have any idea why this drive would not work on my mac pro but does work on my imac?
I'm not entirely sure that's true. Please clarify exactly what you're doing; what's connected where and how, and what's being backed-up.
On the Pro, you have 2 internals and how many externals? Which ones are being backed-up (ie, not on the exclusion list in TM Preferences > Options)?

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