A thumb drive question, please . . .
After years of no problems, my 10.15.5 Mac has seemingly given up on small Sandisk drives -- they no longer work and don't appear in the Finder. In fact, that whole lower bit of the Finder's list at the left of the Desktop about attachments is no longer shown! Just blank.
Further strangeness: When a drive is inserted, it does appear in the Disk Utility -- and when it's taken out there's a notice about how it wasn't removed correctly.
Do hope someone recognises the problem,
Fortes
iMac 21.5″, macOS 10.15