Unformat floppydisk emulator

I suggest you contact the seller in this link to see if this will work for you.
Roland MC50 MC 50 Floppy to SD USB FlexiDrive Floppy Emulator

Your questions,what does it mean?
If you use PA50SD,of course you don't need floppy emulator.
If you use PA50 with floppy emulator,you need to format the flashdisk with special softwares (SFD 1.23 etc) that usually included when you buy the emulator.

The floppies in most of the music instruments are NOT quite compatible with the USB floppie emulators.

The floppy drives of this age often required strapping to select the unit number and other setups. Newer drives were not compatible. Make sure the drive selected light remains on when power is on. If not, check the drive selections jumpers for the drive.

It is VERY easy to not have gotten the cables back and seated completely for the floppy disk. ALSO it is very easy to damage the ribbon cables on floppy drives by pulling at the edges of the ribbon to pull connectors off. One MUST distrbute the force all across the cable as it is easy o damage the connections in the connector for the wires near the edge. It is also easy to damage the pins on floppy drive connectors. You will need to reopen the unit and check the cables INCLUDING the little power cable to the drive. If you have damaged the ribbon cable you can either replace it or possibly get another connector and put it on the cable right next to the one with the problem and crimp it in a vise... These are an insulation displacement type so you need to get it on straight and ALSO verify the index is the right direction before crimping. For your problem think cables, cables, cables...

This ONLY applies if you have a floppy or hard drive in your unit...

SOME of these synths hang up during boot if the floppy or hard disk isn't recognized as working...

Also verify your power adapter is producing the right voltage and is the original.

This sounds like it MIGHT be a floppy drive problem rather than a full memory... REMEMBER to ONLY try recording a file no bigger than what the floppy will hold which is 720Kb.

NOTE: The disks used in this are not the COMMON 3.5 inch floppies, but the older 2DD 720K floppies. They have only one hole on corners where the new 1.44 Mb ones have two holes.

To USE the 1.44 Mb flopies do this: Use an opaque tape to cover the hole that does NOT have the write protect slider. THEN most omportantly DEGAUSS the disk with a degausser. THEN Reformat the disk in the CVP 65.

The pre-formatted 1.44 disk when formated at the 720Kb used by the CVP 65 will have ARTIFACTS between tracks since the higher density also have half the track spacing and the formatting doesn't always clean enough width leaving artifacts between the tracks when formatted as 720Kb These ARTIFACTS can cause trouble.

The 720Kb disks are ESSENTIALLY unavailable anymore.

Either the floppy format of the Triton is not PC compatible or maybe you don't have a floppy drive on your computer? If the latter, buy a USB floppy drive... about $20

Have you tried formatting the disc using your MPC 200XL?

try getting a cleaning floppy disk  (the head might be dirty)
hope this helps