HEADACHE!!! How to fix the unknown user on my external hard disks?

I applied 10.5.1 update and now my Volumes permissions are screwed!
Read thru similar problems in these discussion forums and not sure what the folks are writing about. Too technical for me. I basically know that if I can't correct the permission, I can't write or change stuff I need to do with the external HD.
I have an (unknown) Read & Write in my external HD's Get Info. I'm unable to remove it. If I tried to add a new name, my Finder will relaunch.
HELP?!!! Really need a step-by-step guide to fix this problem.

1. Launch System Preferences and select Sharing pref.
2. Select File Sharing and you'll see *Shared Folders:* and Users: boxes.
3. Drag affected Volume to the *Shared Folders:* box and you'll see the users permissions in the Users: box.
4. From the Users: box, you can add or remove users and correct their permissions.
Works for me. Didn't have to use Terminal which was too complex for me.

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