Disk Utility
How do I get rid of a drive showing up in Disk Utility that was plugged in my Mac but no longer there. I was testing some old external drives but unplugged it and now still showing up.
iMac 21.5" 4K, macOS 10.14
Try restarting and doing a PRAM reset (Command+Option+P+R). Do it twice then restart normally and check Disk Utility.