Shared external hard drive - No users listed and can't add them

I have an external drive connected to my iMac that is set as a Shared Folder. I regularly access this drive from my iBook. I had unusual difficulties recently with this drive not showing up as an available volume when I connected to my iMac from the iBook, so I took a look at my File Sharing preferences.
When I select the external hard drive in the Shared Folders column, no Users appear to the right. When I try to add a User, there's no effect. I am able to go through the process of clicking on a User in the selection box, but when I click the Select button, nothing shows up in the Users column. I have removed this drive as a Shared Folder and then re-added it, but that hasn't changed the situation.
I have a second hard drive (the two external drives are Firewire, daisy-chained LaCie's) connected to the iMac that typically isn't shared. Just as a test, I added this drive as a Shared Folder, and automatically settings for System Administrator, Administrators, and Everyone populated the Users column. So, the two drives are behaving differently.
Also, if I add any folder on the first hard drive as a Shared Folder, the folder comes with Users assigned to it, and the Users settings can be modified as normal. So, it's only the root level of this one hard drive that is behaving differently.
I don't know if this strangeness has anything to do with the recent difficulties with connecting to this drive from my iBook. But regardless, I'm curious about any explanation, because it doesn't seem right.

sariputtas-imac-2:~ jpc$ ls -ladeO /Volumes/"Yellow Birch"
drwxrwxr-x@ 27 501 staff - 986 Feb 18 13:33 /Volumes/Yellow Birch
0: group:admin allow list,addfile,search,add_subdirectory,deletechild,readattr,writeattr,readextattr,writeextattr,readsecurity
1: user:jpc allow list,addfile,search,add_subdirectory,deletechild,readattr,writeattr,readextattr,writeextattr,readsecurity
And, by the way, this is the output for the terminal command on the second drive that does show its users and privileges normally in the File Sharing window.
sariputtas-imac-2:~ jpc$ ls -ladeO /Volumes/"Katsura-Backup"
drwxrwxr-x@ 21 root admin - 782 Feb 15 08:24 /Volumes/Katsura-Backup

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