I see now in broshure about Hard Disc:

An optional internal hard drive can
be installed (Type SATA 2/3_ 2.5” ) to expand storage capability,backup important files and
file management.

Also ins Accecory i see that we can to expanded 500 Giga HD..
http://www.ketron.it/en/products/28-tastiere-elettroniche/sd9
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Style Producer
Ketron Event, Ketron Audya 76, Audya 5, SD9, SD1,Yamaha Genos, Korg Pa3x, microarranger, Roland Fantom G6, V-Synth XT, XV-5080, SH201, D-50, Novation KS4, Dave Smith Evolver