Hi all,  In regard to the 720 kb floppy diskettes, I recommend
to download the utility WinImage v8 (621 kb).  The address is
  http://www.winimage.com/download.htm 

In the Disk Menu, select "format disk" and you will have all types
of formats for floppy disk, standard and non-standard.  This function
works okay in the demo version.

Good luck!
Gustavo Colmenares - Proyecto Pianola
Caracas
http://kuainasi.ciens.ucv.ve/pianola