Reviving this old thread.
I have an Akai S-612 with MD-280 Quick Disk drive. The drive is not working but I'm reasonably sure the interface/controller board is working (powers up another QD drive scavenged from a Yamaha FB-01 -- but this drive needs a belt replacement)
Give me a day or two and I can upload pictures of the 10 pin connector and the controller board.
If we can get this working then it would also help Roland S-10 and Famicom Disk System owners.
Disk format, sector and track info: http://wiki.nesdev.com/w/index.php/Fami ... isk_System
I'm about 90% sure the FDS used the same format as the samplers. As far as I am aware no one has dumped/imaged one of the sampler Quick Disks to PC using one of the pirate FDS dumpers.