My OS is EC and I'm the Admin. I'm using a desktop. I hv permanently plugged in 2 external portable hardisk, one for TM and another as 2nd backup. I hv created another account User but unchecked "Allow user to administer this computer". Once in the User a/c, he is able to see and can access to TM and 2nd backup disk. That means the user will able to change anything that is personal to me. The user is one of my family members and he need to save files for his work. Hence Guest User is not an option as once he log out, all data will be gone. Best I can do is unchecked external disk from viewing in the Finder preference. But he merely have to check back and access. How do I disable the portable disk from the User having access permanently?