External Hard Drive Not Showing Up after dragging it to Terminal? So from the left side of the Finder I accidentally dragged my external hard drive and now it doesn't appear there. I would like to see it there, I know it's reading it because I did an ls /Volumes and it's there. How do I put the drive back in the Sidebar?

Note 1: I tried to command+shift+G and went to /Volumes and tried to drag it in place that won't work, what do I do?

Note 2: It's not "Choose Preferences from the Finder menu, click on Sidebar, and check the box for it". The problem is with one particular external drive, I dragged it out of Finder and can't put it back.
I had the exact same issue. Here's the solution: open a Terminal and do the following:

open /Volumes/[Your external hard drive]


This will open up a Finder window which shows your Volumes, including the external drive. Just select and drag the drive back to the left panel, under Devices.