BUT... predating that was a "Macintosh Hard Disk
20" that was not scsi.
Rather is was some drive (don't know what kind, but MFM seems sensible
enough) that used a special adaptor board that enabled it to plug into
the disk drive port on a bunch of the older macs. It was all enclosed
(drive, power supply, adaptor board) in one nice zero footprint beige
case (back when beige meant brown, and not grey like "beige" computers of
today).
In spite of the now long-extant senility, I seem to recall that these
interfaces through the serial port, not the floppy port.
Regards,
-dq