I have a script that mounts an MP3 device, copies files and umounts. As
I have counted on the umount to hang until the data transfer is
complete. That has worked fine until recently. Now the umount finishes,
leaving much of the data uncopied.
Fedora 32, up-to-date at end-of-life.
Has some parameter been changed inadvertently? Or was I just lucky, and
my luck has run out? If so, is there a way to test for the real end of
transfer?