Hard sectoring is a relic of floppy disks. Here a small punched out hole in the floppy disk and in the floppy disk case provided the initial marking of the sectors
.signal. The hard sectoring technique is no longer used today. Today's media, hard disks, DVDs and floppy disks are soft-sectored, i.e. magnetic. The earlier 8" floppy disks had a whole row of index holes on their periphery.