[sgroup] S770 floppy drive

My S770 needs a little love, I need to figure out why the MSX mouse I have won't work and it has been suggested that it could be issues with the connections INSIDE. So I figure if I am gonna open it up I would test everything else first and see when other work it might need. I usually use my SCSI Jaz disk to save and load samples, but floppy can be convieneient sometimes. I noticed that no matter what I do I can't get the internal floppy to read or write to a floppy disk. I am pretty sure I read somewhere that the 770 will read and write to 1.4Mb disks. Is this true and what type of floppy drive do I need to replace the one inside the 770? Can I use any drive or is it Roland Specific? Thanks