Hi Ray, the drive fitted to the KN5000 is quite unique and was used in Technics Kn5, Yamaha, Korg and various other musical instruments. it is not easy to replace because the Drivers used are unique to that disk drive, the one used in the KN 6000/6500 is more likely to be an "Alps " unit, I will do some more digging on what units you can use, Technics Keyboards and Organs have used a lot of different Disk Drives over their time but not many are interchangable
RegardsJohn.