Hi & thanks for the reply.
The icon is of the same drive mounted (if you look at the names) but with a locked icon. I will try to explain what is happening a bit better...:
1. logged in as user with those 2 drives mounted (I have a script that automounts the drives)
2. Switch to another user.
3. Log back into original user & it attempts to auto mount the drives & you get as per the screen grab with locked icons from the previous session.
I hope I have explained this correctly!