debian/config/mtoolsrc

   1 drive a: file="build/img720k"  cylinders=80 heads=2 sectors=9 mformat_only
   2 drive b: file="build/img1200k" cylinders=80 heads=2 sectors=15 mformat_only
   3 drive c: file="build/img1440k" cylinders=80 heads=2 sectors=18 mformat_only
   4 drive d: file="build/img1743k" cylinders=83 heads=2 sectors=21 mformat_only