I did that already and it makes no difference:Can you try what happens when you disable BackBlaze and then restart PSU?
Changed Drive letter to E:, Windows says it will continue to be used until restart, thus re-start, Backblaze tells me it does not work, since it cannot find F:. Thus I stop backblaze and do the remap in PSu, and tghen all as above:
E: gets remapped, 3310 folders, E: without count, F: with red dot, PSU restart (Backlbaze NOT running), only F with red dot, no E: drive...
Change drive letter to F:, restart PC, shut down backblaze, remap E: to F: in PSu, F: recognized, E: as red dot, restart PSu now F: with red dot, running your script, message that E: is missing, no message about F:
Note, I have two drives that PSU was always able to see, F: and G: