External HDs NOT showing in finder on Mac Mini Server

On my brand new mac mini server. for the life of me, I can't work out why my 3 external firewire plus the thunderbolt drive we use as the actual drive we all connect to one the network, just will not show either on the desktop OR in the left column of the finder?
I have gone into finder preferences and selected External disks and no joy. am I missing something? In fact, I'm fairly sure that at least the thunderbolt HD was showing when I first got it a week ago with teh mac mini.?
Superduper and disk utility CAN see them and this is the ONLY way I can do a safe eject currently as I have no other way to eject.
What might be happening do you think?

Hi Antonio, did you ever try this?
https://discussions.apple.com/message/21061564#21061564

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