How to restrict External Drive access in other user accounts

I just purchased an external HD and moved my iTunes and iPhoto libraries to it. No problem there.
My Mac mini has four user accounts and I'd like to set the permissions on the external HD so that only I can write to it from my account. I'm attempting to do this through 'Get Info' on the external drive, then setting Sharing & Permissions to 'Read and Write' for myself and 'Read only' for the other three accounts. But it seems that when I set one of these it gets set for all four accounts.
Am I doing something wrong trying to set the permissions this way, or, is there a better way to do it?
Thanks,
Andy

I didn't realize you could set the privileges for other user accounts in the 'Get Info' box from my account. I added the names of the other three accounts and set them to 'Read Only' but I am still able to delete files from the drive when I'm logged into those accounts.
What I'm trying to do is set it up so that either (1) they can't accidentally delete files from the external disk or (2) they can't even see the disk at all from those accounts. I would have thought that 'Read Only' would not allow them to delete files, but with the privilege set to 'Read Only' I'm still able to delete files from the disk.
Maybe I'm missing a step? Or maybe there's another way to do it?
Thanks,
Andy

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