Unknown drive has appeared in 'Import' screen?
Hello,
I have noticed when importing photographs that a new 'drive' has appeared in the Source list in addition to the usual 'Macintosh HD'. If I click on 'Import', under 'Source' it lists 'Macintosh HD', which appears to work fine, but it also had a new drive named with a random string of letters and numerals (see screen grab below). This 'drive' does not show any folders when I maximise it, although it appears to have the same capacity as my 120GB 'Macintosh HD' drive. Is there a way to delete this redundant drive?

I think these problems started occurring after recently running the disk cleanup utility on my MacBook Pro (running macOS Sierra version 10.12.3), so I am not sure if this has altered my setup somehow. I've tried reinstalling Lightroom but to no avail.
Any advice would be appreciated!
Thanks!
Paul