The main problem with the KN7 is if the files are in a folder it does not matter if you use an SD or floppy the system used by Technics does not enable you to open folders only files of a pre- arranged format ie:- cmp or in this case tm.
As far as the fact most modern PC and laptops do not have 3.5" drives,all but the very latest and most expensive Keyboards still tend to use floppies, either directly or that software is supplied on disk,also as most pro keyboard players tend to get their pound of flesh out of their kit,those of us in that boat floppy drives are essential and many makers supply USB connectable drives which work very well (tested them out on my daughter's laptop) and they are not too expensive on Ebay and the like.
Best regards John.