Hard Drive Corrupt After Failed Software Update

Hi everyone,
I have an iBook that was recently down for about a month due to a failing DC in board. After replacing the board and restarting, I had a month worth of updates in software update. I installed the two that didn't require a restart -- I think they were the latest iTunes and Quicktime updates. Something went wrong in the middle of the install and after waiting with the OS locked and the hard drive spinning for a couple hours I finally did a hard restart.
Now upon startup I get to the grey Apple logo and the indicator spins while the hard drive goes back and forth between clicking and spinning. Apple Hardware Test says everything's fine, Disk First Aid gets to "Checking Catalog file" and then errors out:
Invalid key length
Volume check failed
I'm wondering what my best option is to restore the disk since I know my actual data is still there. Also, I haven't tried using target disk mode for anything -- is that worth a try? Thanks.

Matt:
"Invalid key length" is a directory error which cannot be repaired by Disk Utility. You will need to use a utility like Tech Tool Pro or Disk Warrior. Otherwise, you will need to reformat, erase and reinstall. If you do not have your data backed up you can try using Firewire Target Disk Mode with the assistance of a second firewire Mac.
cornelius

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