Drive fails verification, but Disk Utility on OS X disc shows no errors

Hi everyone,
After running Disk Utility locally to verify my disk, I received the following message:
Volume Header needs minor repair
Error: The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair
I know I can't repair the disk while I'm using it, so I restarted with my Mac OS X install disc and ran its Disk Utility to verify and repair the disk. However after running another check on the disk from the OS X disc, it told me that the drive seemed okay and didn't need repairs.
Huh... weird. So I went back into OS X and reran Disk Utility to check the disk again -- same error returned.
So I'm left with a disk with errors, but errors that I can't fix because the OS X disc refuses to acknowledge that they exist!
Is there another solution to this that I'm missing? I've also tried running fsck from single-user mode and it tells me the same thing as the OS X disc -- no errors. What's going on here? Can anyone shed some light on this?
Thanks so much,
Danny Stewart
Mac mini   Mac OS X (10.4.6)   Intel Core Duo, 1.66 GHz

Hi Mario,
Apologies for the delay in my response. Here is the output from the log file after running a fresh scan:
Jun 29 23:30:11: Disk Utility started.
Verifying volume “Danny's Mac”
Checking HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking volume bitmap.
Checking volume information.
Volume Header needs minor repair
d.",1)
Danny's Mac
Error: The underlying task reported failure on exit
Disk Utility stopped verifying “Danny's Mac” because the following error was encountered:
The underlying task reported failure on exit
1 HFS volume checked
Volume needs repair
I hope this helps to diagnose the problem, although it doesn't look particularly helpful. Anyway, thanks for the assistance!
Best,
Danny
Mac mini Mac OS X (10.4.6) Intel Core Duo, 1.66 GHz
Mac mini Mac OS X (10.4.6) Intel Core Duo, 1.66 GHz

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