Hard sectoring
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Hard sectoring in a magnetic or optical data storage device is an archaic form of sectoring that uses a physical mark or index hole in the recording medium, from which sector locations are referenced.
Hard sectoring was most notably implemented in older 8- and 5ΒΌ-inch floppy disks, by punching an index hole in the disk. When the presence of the index hole was recognized by an optical sensor, a reference signal was generated. All sector locations could be referenced from this signal.
