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  If you're planning to share or sell your programs, you must decide which
  diskette format you'll use to distribute your software. Initially, most
  software vendors used single-sided 5-1/4-inch diskettes with eight sectors
  per track, because this format was the lowest common denominator that
  could be read by all versions of DOS. Later, as single-sided diskette
  drives became virtually extinct, software publishers adopted the
  double-sided 5-1/4-inch diskette format as an acceptable medium.

  If you sell software for both PCs and PS/2s, however, you must contend
  with 3-1/2-inch as well as 5-1/4-inch diskette formats. In this case, you
  should probably stick to the 720 KB format for 3-1/2-inch disks. You
  should also offer a choice of diskette sizes, because both 5-1/4-inch and
  3-1/2-inch formats are in widespread use and will be for some time to
  come.