External FW drive only on LAN for Administrator

I can log into the computer where the fw drive is attached but the external drive is only visible for mounting if I log in as an administrator. I've tried with Ignore Ownership and with ownership.

If you are the owner of the computer, you should be the Adminstrator. Upgrade your account to Admin.

Problem solved with Sharepoints

Yes. I can login as Admin. The problem was that only Admin had could see the external drives. I created a "share" with Sharepoints & problem is solved. Thanks for the input.