I have multiple movies and they are located in dirs with their starting letter. Example:
Movies/A/Alien/Alien.mkv
I like to have all "A" movies on the same Disk so I should choose the split level "Automatically split only the top directory level".
Lets say all movies with "A", "B" and "C" fit on Disk 1. What happens if I add more "A" movies and they do not fit on Disk 1 anymore? Does it move all existing "A" movies to a different Disk that has enough space left or does it ignore the split level rule in this situation and create an additional "A" dir on a different Disk?