After upgrading to Catalina, I can't add External Drives for scratch disk space in Photoshop. I read several threads on this subject and did the recommended fixes: adding Photoshop to my Mac Mini's (2018) Accessibility in Catalina's (v. 12.6) Security & Privacy, also added PS to Full Disk Access. I dragged the Photoshop 2022 system preferences folder from my user name > library > Preferences to the desktop and restarted Photoshop. None of this fixed my issue, which is that the external hard drives aren't showing up in Photoshop's scratch disk preferences panel. Those external drives are at 10 TB G-Drive Thunderbolt formatted as Mac OS Extended (Journaled) and a LaCie 10 TB Thunderbolt drive formated as Mac OS Extended (Journaled). I have never had this problem before Catalina, which is exactly what seems to be the catalyst for this phenomena's sudden appearence. What should I try next?
I've been using external hard drives as scratch disk since Photoshop 2. Never saw this issue until upgrading to Monterey 12.6. I can see them in the finder. I can launch files, but I'm not sure what you mean by non-removable.