OK… now I see two scenarios
Some days ago I imported a folder from import dialog /run/media/drivex
The drive was listed at the legt side nearby Other location tab.
Today only skulls are shown as the drive mapping is invalid.
Now I can find the device as proposed unser /mnt/drivex.
I can remember that the first device was listed as sdd1 whereas the current one was sdc1.
Maybe some drive information is still not cleaned up. I did a umount every time.
Thks for the time to clarify my troubles
S.F