To make it go away, you need to at least create the top-most “mount point” directory which PMS went looking in.
e.g.
If the previous disk was mounted as /mnt/disk3 and /mnt/disk3/movies is where all your movies were,
then,
- mkdir -p /mnt/disk3/movies # so PMS can see the top-most directory of where the library is.
- PMS now satisfied, A normal Scan files will look like the media has been removed and the media directory for that Library section is intact.
- Empty Trash
- Clean Bundles
It should all clear out.