Restricting access to external hard drive?

Sorry if this has been answered before, I searched but didn't find anything.
My employers have one computer that has 6 or 7 users, 3 of whom are administrators. How can they restrict access to a Maxstore One Touch External HDD so that only the admins can do anything with/to it from the computer?
They would prefer that no one except the admins can even look at files on that drive but the main desire is that no one else can delete files or write to that volume. Can anyone help us out with this?

Thanks,
Sharaye

 

Yeah, that's about what I told them.
Thanks.