My external drive mounts but doesn't show in Finder anymore?

I was accessing my iMac external backup drive over the network from my laptop and it suddenly greyed out.  Going to my iMac I discoverd that the drive was mounted according to Disk Utility and my backup utility could find it but it doesn't show on my desktop or the sidebar of the Finder window.  I can access it thru the Go to Folder menu item.  I can then drag items to it but can't save items to it directly since it doesn't show up in Finder. I have checked Finder preferences, restarted the iMac, dismounted (in Disk Utility) and remounted it.  I've also eliminated it in Sharing system preferences.  No luck on all counts.  I connected it to the laptop and it behaves the same way.  Doing a Google search turned up the possiblity that it has become "invisible" but I'm confused as to how to change this attribute.  I'm hoping there is a simple Terminal command I can use.
Looking for some help here!

Yes I did Eric.  Then just found the answer.  Volume became hidden and I used a Terminal command.
Thank you for reading my question and suggesting a solution!

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