Missing external partition

I have an external drive which has two partitions, both showing up in the finder when it is turned on. While trying to open a file from one of the partitions I thought I saw a puff like a cloud emanating from where the cursor was and when I returned to the finder, that particular partition was no longer showing. Both partitions are still visible on the desktop however.
Any ideas on how I can get the partition to show in the finder again?

If you mean the Finder window sidebar, Finder->Preferences->Sidebar->toggle the various settings. Alternatively, drag the Desktop icon back into the sidebar (that's a WAG, since I've turned off the sidebar in Finder windows).

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