Hi,
I think you need to read the manual to see what sort of file-system the keyboard uses.
What computer and operating system are you using?
I don't see an answer to this. Did I just miss it?
This seems relevant.
"PianoSoft floppy disks from Yamaha, and floppy disks formatted in the Disklavier cannot be seen by your computer because nothing is written on boot sector of the disk.
However, you can format disks on your computer that can be read by the Disklavier.
Starting with the MarkIIXG models, any IBM formatted 1.44 MB diskette will do.
However, for those models (MX100A/B, MX80, Wagon Grand, and MarkII) that can only read a 720k double density disk,
formatting can be an adventure with newer computer operating systems like Windows 2000, NT and XP.
I suggest that you obtain or keep an older laptop or desktop computer with a Windows 98 or older operating system that support DOS."
Does the Disklavier have internal storage?
Sounds like you need to format some floppies in your pc, I'm guess FAT or FAT32,
then copy whatever you want on to them from the Disklavier.
If it doesn't have internal storage I don't know what you can do.
It is possible to write MBR to a disc without altering its partitions and contents, but I'm thinking there's risk involved.