That isn't what he wants. He wants calibre or the drivers to remove any empty directories from the device. The problem is there is no way to know if calibre/the driver was responsible for the directory in the first place. It might be practical to do it for a driver than scans the devices file system, but for one like the Kobo driver that doesn't, it would add a lot of overhead to do it. I might consider it for a separate plugin, but not as part of the core driver function.
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