On Mar 6 2024, at 11:02 am, David Kastrup <dak@gnu.org> wrote:
Just got myself a Ketron MS-40 arranger and its floppy drive had been
replaced by a "Lion's Tracs Megafloppy" drive.

From the context here:
http://www.eunet.bg/eunetweb/lucho/project.html#others
it appears that Lion's Tracs may have been a MIDI file recorder which used floppy disks, so perhaps someone scavenged a working floppy from a Lion's Tracs to replace a damaged drive in the MS-40.

-- Chris