Disklavier

Hello, 
We have a disklavier with an aftermarket yamaha system fitted, it has a yamaha control module RF PPC3    i got some floppys to download the files on here from  i wonder if i got the wrong type, these are DSDD 2DD 720KB    when i try to download  it says   format the disk,  when i do this  it says   cant format this disk type,  i tried on windows 7 and xp,  i then noticed an original pianosoft disk i have says FD 2DD   is this a different sort,  i also tried a hd disk   this did let me format it   and i downloaded the song files  but it wont play in the machine, Getting a bit lost with file types ! Thanks in advance for help.