Partitioned External Hard Drive - Permissions.

I have an external hard drive that is partitioned into two volumes. Recently one of the volumes has not been showing on the desktop. I tried repairing and verifying the drive with Dick Utility (this second partition is visible with a generic icon) and says everything is okay. I think this might be a permissions issue - this problem appeared shortly after changed volume permisions for differnt users. Problem is no user can see the drive (Admin or others). Is there any way to revert, delete or fix this so that I can access the second volume?
Running Mac OS X 10.4.11
Thanks for your Help.

Running Mac OS X 10.4.11
This is the Leopard forum.
For future reference, the Tiger forum is here:
https://discussions.apple.com/community/mac_os/mac_os_x_v10.4_tiger?categoryID=1 77

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