On a related note, this thread appeared on the Korg forums a while ago. Rather than repairing floppy drives, it concerns replacing floppy units with a 'floppy emulator' and its advantages.
http://www.korgforums.com/forum/phpBB2/viewtopic.php?t=59378&highlight=floppy+substituteMaybe it could work on other brands as well.