Weird Disk Repair warning for backup drive

I used to run Time Machine and Silver Keeper (Lacie software that came with my 2TB backup drive). Both backed up to separate partitions. Yesterday I decided to stick with Time Machine only. So I deleted the Silver Keeper's partition and then extended Time Machine's partition for all of the drive. I used Disk Utility to do this.
This morning, when I turned my computer on, I got this error after starting up:
"Disk Repair
The disk "2TB-TM" was not repairable by this computer. It is being made available to you with limited functionality. You must back up your data and reformat the disk as soon as possible."
Well, I was able see the drive on the Desktop and access all the backup files--until running Disk Utility. TechTool Deluxe does not see the drive. But Disk Utility does see the drive. But the Verify/Repair Permissions is greyed-out. When I click the Verify and Repair Disk buttons, I get this error (in bold red letters):
Invalid record count
Volume check failed.
Error: Filesystem verify or repair failed.
I can reformat this drive as it recommends. But I'd rather not if it's a simple fix. Any suggestions?

Eric Basir wrote:
OK, I'll reformat. I'm assuming that will fix the problem and my drive will be back to its normal self. I also assume that I messed it up with that repartitioning. Do I need to worry about my drive being broken or replaced?
that's hard to say now. reformat and see what happens.

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