Create the folder/directory, but with no contents.
Connect to Calibre
Go to device settings
untick that folder/directory (new ones are ticked by default)
Now exit calibre
You can now put 1000s of files / subdirectories in that new empty one and Calibre won't scan them.
So when getting a new device with maybe 32G to 1000 G SD card, first create the empty top level directories and then connect to Calibre before adding the content.
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