After upgrading from Lion to Mountain Lion, my MBP does not show icons for external drives on the desktop any more. In the Finder preferences, “External disks” is checked under “Show these items on the desktop”. Any ideas?
Aha! Just after posting my own frustration with this problem, and how none of the solutions provided here were working for me, I noticed one stray white pixel at the top left of my screen. Turns out it was the edge of the text name of a missing drive icon.
It appears that some drives are mounting with their icon at the screen origin (or possibly even further offscreen).
Try using "Clean Up By Name" to bring the drive icon back onto the screen. If that fails, this might work:
- Click anywhere on the desktop.
- Type the first few characters of the name of the missing drive.
- Hold the Shift ⇧ key and click on another icon.
- Drag the second icon around and see if the missing one is coming along for the ride.
I had a similar problem. After upgrading to Mountain Lion on my iMac, Finder would display my external hard drive icons on the desktop, but would not list them in any Finder windows, including upload windows opened by websites (ie blogs, Facebook).
After viewing Xavi's Youtube link (thank-you Xavi! http://www.youtube.com/watch?v=E8tqZSBs-4k), I discovered that Mountain Lion hides a number of items from appearing in your Finder window and sidebar by default.
Just go to Finder>Preferences>General and look for the 'New Finder Windows Show:' option, and choose 'All my Files'.
Also, you'll want to go to the Finder>Preferences>Sidebar tab and make sure that your external drives are check marked, not ticked (-). Hope this helps!