Haven’t made the jump to the Leopard of Snow just yet. Thank God!
Maybe apple will finally chew their food before swallowing.
Heard alot of problems with with external drives, I had the same and disk warrior did fix the problem but on 10.5.7. However with Snow Bunny who knows. Maybe run it a couple of times, sometimes it just stops on my machine and I have re-run the program
Had several friends loose access to external drives as well as speed after making the switch.
Before you go re-installing your entire systems, losing money, so you cant afford the next OS and the next Hardware device to go along with it, try moving all of you data off one drive to another, run disk utility or a raid utility. You might need to erase your drive but it beats re installing every application, thats if you have another hardrive?
https://www.alsoft.com/DIskWarrior/support.html
Good luck