Time Machine: Cannot find backup (external hard drive)

Hello and thank you in advance for your help.
I have a MacBook Pro and am running OS 10.6.8 (Snow Leopard). I use TM to back up to a 500 GB LaCIe external hard drive, which has worked fine for over a year of ~monthly back-ups. The back-up porcess typically takes some time, but less than an hour or so. While backing up this week, it just halted....and was still backing up 24 hours later. I quit the back-up, dismounted and remounted the LaCie, tried again, but it still got stuck in the backup process overnight. After searching the forums, I used the disk utility to re-partition the LaCie to ensure it had only one partition. When I re-started TIme Machine, I got the message "Your Time Machine backup disk can't be found." It shows up in finder, but when I tried to find it in the TM Preferences, it's not there, so I cannot select it. I dismounted the LaCie, rebooted, and remounted the LaCie, but that didn't fix anything. Help, please?

Part 1 of my problem is fixed. I decided to run the disk repair and then re-do the partiton process, but this time, I kept the default name assigned to the partition by disk utility ("Untilted-1"). Now TM sees it, and is backing up. Part 2 remains to be seen. I expect it will take 24+ hours anyway, BC I reformatted the LaCie, and this is essentailly the first backup on a re-formatted hard drive.

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