# File test/backup/DSK.rb, line 278
  def <=>(other)
    return -1 unless other.kind_of?DSKTrackSector
    return track_no<=>other.track_no unless track_no==other.track_no
    return sector_no<=>other.sector_no unless sector_no==other.sector_no
    return offset<=>other.offset
  end