Cannot unmount volume

I was doing a maintenance on my system yesterday. I used DiskWarrior to do a rebuild on all the volumes. All was okay, except for my Mac HD 5 volume. I got this message when I tried to run DW 3.0.2 on this volume:
Repairing disk for “Mac HD 5”
Repair attempted on 1 volume
0 HFS volumes repaired
1 volume could not be repaired
Repairing disk failed with error Could not unmount disk (-10000)
When I used Disk Utility, verify disk volume, it said all was OK. But when I tried to verify permissions, it stopped about 1/4 of the way through. And then gave me a message "lost connection to volume, cannot unmount". Or to that effect.
I then tried TechTool Pro 4.1.1. I did a disk check, and all was okay. But when I tried to do a Volume check, I got this message from TTP:
Volume Structures
Tuesday, July 25, 2006 9:48:01 AM Canada/Eastern
Unable to unmount volume
Volume: MAC HD 5
Mount Point: /dev/disk0s3
Format: HFS+ (Mac OS Extended)
Journaling: Enabled
Case-sensitive: No
Created: 02/17/06 09:13:14 PM
Modified: 07/25/06 09:27:36 AM
Capacity: 79.88 GB
Used: 78.72 GB
Available: 1.16 GB
Files: 170,733
Folders: 41,464
Writable: Yes
Ejectable: No
Removable: No
There are a variety of invisible files, settings, and parameters that the Macintosh file system uses to locate files, free disk space, and for other maintenance and management routines. Damage to these critical data structures can result in lost or damaged files and may even necessitate a complete reformat of the volume.
Completed
Unable to unmount volume
TTP didn't actually complete a volume check. I hit start volume check. And it would just indicate it was complete, without actually every doing a full check.
Hopefully, there is a way of fixing this, without have to reformat the volume.
Also, I cannot startup from this volume. Tried, just got the grey Apple screen.
Thanks in advance.
G4 AGP 1.2Ghz upgrade, 896MB ram, LaCie DVD RW   Mac OS X (10.3.9)   StarTech USB 2.0 card, 30GB, 80GB, 120GB HDs

Thanks dot. But I figured it out already. The problem was that the "automount volume folder" was deleted from the Mac HD 5 volume (have no idea how). These are invisible files, so I used Tinkertool to make them visible. That's how I realized that the automount file was missing. All the other volumes contained automount files for ALL the volumes (including for Mac HD 5). Except for Mac HD 5. This volume was missing it's own automount file. So I just copied the file over from one of the other volumes. And voila, Mac HD 5 is now bootable, and can be unmounted for volume maintenance.
Everything is working as it was.
G4 AGP 1.2Ghz upgrade, 896MB ram, LaCie DVD RW Mac OS X (10.3.9) StarTech USB 2.0 card, 30GB, 80GB, 120GB HDs

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