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The Yamaha Music Disc Recorder MDR-1 was a floppy disk unit which could be attached to the FX/FS organs and digitally record and play back Electone and Clavinova performances.

Two models were produced:

• MDR-1A for the FX-1, and
• MDR-1B for the FX-10, FX-20, FS-20, FS-100, FS-30, FS-200, FS-50, FS-300, FS-70 and FS-500.

It used 3-inch compact floppy disks which could store 200 KB per side, at a maximum of nine programs.

It measured 190(W) x 273(D) x 109(H) mm and weighed 4.5 kg.

It was later followed by the MDR-10.

• Yamaha Black Boxes | Yamaha MDR1 music disk recorder