Hi,
you shouldn't remove a attached usb storage device without unmounting it.
This can be done on the sources tab.
List of mounted USB drives. To safe unmount a drive, click on it and confirm at the dialog prompt.
You can try:
- disconnect all usb storage devices
- remove all entries from database
redis-cli del usbmounts
- delete all subdirectories in /mnt/MPD/USB/
rm -r /mnt/MPD/USB/*
- rebuild your library (sources page)
- attache new usb storage device
Frank