Locked Hard Drive / Can't Change Privileges or Permissions!

My non-bootup internal hard drive (a RAID array) is locked. I don't know how it happened for sure, but I can't view any of my files or change any of the disk's privileges or permissions.
Disk utility can't un-mount the disk, but says in the "Disk Check" that everything is okay. The option to repair permissions in Disk Utility is grayed out because OS X is not installed on this volume.
I have tried using terminal to CHOWN and CHMOD the volume, but for both commands it says "Operation not permitted." When I CMD-Click the mounted drive, this appears in the info pane:
Sharing & Permissions:
Name Privilege
(Me) Custom
admin Custom
(Me) Custom
admin Custom
everyone Custom
I can't change any of the "custom" settings, whether I unlock the padlock or not. All I can change is "Ignore ownership," which does nothing to help...
I already archived my OS and re-installed 10.5, then upgraded to 10.5.7 and still no luck. I'M TOTALLY STUMPED! Any ideas?

Okay, it looks like I've solved the problem. After LOTS of searching, I found a discussion that led to the solution... I first ran this command in terminal:
ls -alO /Volumes
This command revealed that the "user immutable flag" was set (the text "uchg" appeared with the problematic drive) and permissions looked odd. The following commands fixed both problems:
chflags nouchg '/Volumes/<drive name>'
sudo chmod 1775 '/Volumes/<drive name>'
For anyone else who needs help with this issue, here's the URL that helped me:
http://forums.macosxhints.com/showthread.php?t=90894
(Posts 4-10 were great!)

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