Disklavier

Hello all
  I have an older upright lavier mx80 series.  I have discovered all 
the the midi files that are available and would love to play them on 
my piano.  I have been able to convert the midi files over to .fil 
files and have made the pianodir on the disk but my player still 
tells me I have an unformatted disk.  I am using 2hd disks, is this 
the problem?  Do I need the double density disks?  I have been able 
to do what I have so far due to this site.  Thanks a million
Jeff