The Roland D20 is a classic electronic synthesiser with a built-in floppy drive, used for saving MIDI sequences and samples.
Weirdly, it seems to use precisely the same format as the Brother word processors: a thoroughly non-IBM-compatible custom GCR system.
FluxEngine pretends to support this, but it has had almost no testing, the only disk image I have seen for it was mostly corrupt, and very little is known about the format, so I have no idea whether it's correct or not.
Please get in touch if you know anything about it.
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To read:
fluxengine read rolandd20 -s drive:0 -o rolandd20.img