I would be careful, because I had a bad disk drive on my KN5000 ,and it would not accept standard drives. I sent the keyboard to a firm that manufactured drives, and they were trying to clone the Technics line. After several weeks they sent the keyboard back saying could not duplicate it.
It was no problem to get a case to fit. The problem was that it would not read correctly due to some propriatory code.
Bernie
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact