It's difficult to see how to fix this. External devices are scanned
because people quite often use USB sticks or external drives with their
I'm not sure whether it is even possible for mediascanner to find out
that some other arbitrary process has asked for a filesystem to be
unmounted. If so, the daemon could back off. If not, I don't know what
else it could/should do.
For what it's worth, placing a file called .nomedia into a directory
prevents scanning of that directory (and all its subdirectories).
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mediascanner prevents unmounting usb device
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