External Hard Drive not showing in Device List

I'm having a problem with an external HDD on my Macbook Air under Mavericks
My External drive is divided into four partitions - the problem is that one of them is refusing to show in the Sidebar "Device" list in Finder
The missing partition is showing in Disk Utility, Terminal and when clicking on the Machine Name under Finder (top level)
Disk Utility reports the disk as being OK. SuperDuper can see the disk as a target.
Any suggestions?

Matrox drive. Was fine under 10.8
Formatted as Mac OS Extended (Journaled) and is mounted as a drive under Finder Machine name and Disk Utility.
The one thing that I see under Disk Utility that differs to the other partitions is that Owners Enabled is set to Yes

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This procedure is a diagnostic test. It makes no changes to your data.
Please triple-click anywhere in the line below on this page to select it:
ls -@Oaen /V* | pbcopy
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
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