Scott,
I tried the defragment function in the 9000 pro (I have a Musitronics USB interface) and it worked; I had only a "little" problem in that afterwards some files (styles) were not recognized by the keyboard, like the defragmenting process had somehow modified their properties, at least from the point of view of the keyboard.
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.