Cannot mount external drive on network when no user logged in

We have a few workstations on our network that have multiple accounts for users in order to preserve preferences, etc. An external hard drive attached to the each workstation, holds work done on that station by the different users. When all users are logged out, the external drive does not appear as a mountable device when trying to log into the workstation from another computer; only the internal drives are seen and mountable.
Is there a way to make the external drive visible and available for mounting over the network when no user is logged in? The external drive is set to ignore permissions for that drive in the get info window.
Additionally, when a user is logged in to the workstation and someone tries to log in over the network to access the external drive, the drive is sometimes available over the network and other times not. What causes this inconsistency?
thx, j

You really want to format it HFS+ wiyh GUID Partition scheme to ensure your data transfers correctly...
How to format your disks...
http://www.kenstone.net/fcphomepage/partitioningtiger.html
(On IntelMac the Drive it needs the GUID Partitioning scheme mentioned at the bottom.)
Not sure if that'll make it see it or not, but your data will be better. Besides, you should be able to install to that then & maybe boot from it to ease matters.

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