How do i deny access to an External Hard Drive while using user switching

Hello,
I have a QuickSilver running Tiger (Leopard upgrade coming when RAM arrives) and have 4 users ( fast user switching enabled). I would like to deny all access to the external hard drives except for the my account on the box.
I have already have gone into the info Sharing & Permissions and only allowed myself to have access, others have "no access" however when I switch user (using fast user switching) they assume ownership of the drives and have access.
Just so you understand the overall direction I would like to go. I'm a photographer and my images are loaded on various external hard drives which is plugged in to the desktop. Family uses the desktop and do not want them to access my work on the external hard drive, however I do need to connect via my laptop to edit images via ethernet which I would obviously enter the admin username and password for the desktop when challenged.
Any ideas???
dsh
P.S. I also changed the permissions via unix to 700 but guess what it doesn't matter! It still assumed the other users ownership upon switch. Does anyone have a proven solution?

D. Fraser wrote:
When you Get Info on the Drives, who is the owner of the Drives? What exactly are the permissions? Do all of the other users use an admin account? You might have to chmod the root user of the drive to your admin account, change the user to no-access, and everyone to no-access.
how does one "chmod the root user of the drive to your admin account"?
can that be done with terminal inside an administrator account, or does root need to be enabled and logged into?
-db

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