Help help!!  Disk Utility reported can't repair my HD

Hello all I used Disk Utility (version 10.5.5) that comes with Mac OS X 10.4.6 to check my hard drive. The diagnostic returned a message that my drive needed to be repair. So I booted up with installation disc and did the repair.
One of the log says there is an error in red font "Invalid leaf record count"
and the repair results were as the following:
1HFS Volume repaired
1 Volume Could not be repaired.
What does "Invalid leaf record count" mean?? And why 1 volume in my drive can't be repaired? How do I repair it?
I only have 1 volume on my HD, I didn't partition my drive. So, what is causing the problem? Should I be ignored? What's the benefit of partitioning my drive?

Sometimes the file directory is corrupted or damage beyond Mac OS X's Disk Utility can repair, but don't panic just yet. Get a copy of Disk Warrior, boot from it and run it, it will build a brand new file directory and replace the old one, that should solve your problems, a lot of us here "swears" by Disk Warrior, in fact I had your similar problem, ran DW and problem solved.
As for disk partition, it is not really necessary in modern OS like the Mac OS X, one of the reason people partition disks (a long time ago) because in the older days of the older Mac OS, it is unable to read a large hard drive beyond a certain size, i.e. if you place a 250Gb (of course then there is no 250 yet) inside your Mac, your Mac probably can only read it is 120Gb large, so that's why you need to partition the drive into 2 or 3 to read.
People also partition drives to run and boot multiple OS, this is especially true maybe for tech guys etc, who may have OS X, various versions, and OS 9 running in different partitions.
Cheers

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