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Hard sectoring

Hard sectoring in magnetic[?] or optical disk storage is sectoring that uses a physical mark on the disk, from which mark sector locations are referenced.

Hard sectoring may be done, for example, by punching an index hole in a floppy disk. When the presence of the index hole is recognized by an optical reader, a reference signal is generated. All sector locations can be referenced from this signal.

Source: from Federal Standard 1037C

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