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Hard sectoring

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Title: Hard sectoring  
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Subject: Disk II, Bit nibbler, Floppy disk variants, Floppy disk
Publisher: World Heritage Encyclopedia

Hard sectoring

These rectangles constitute the hard (factory originated) sectoring of a DVD-RAM disc

Hard sectoring in a magnetic or optical data storage device is a form of sectoring which uses a physical mark or hole in the recording medium to reference sector locations.

In older 8- and 514-inch floppy disks, hard sectoring was implemented by punching sector holes in the disk to mark the start of each sector. These were equally spaced holes, at a common radius. This was in addition to the index hole, situated between two sector holes, to mark the start of the entire track of sectors. When the index or sector hole was recognized by an optical sensor, a sector signal was generated. Timing electronics or software would use the faster timing of the index hole between sector holes, to generate an index

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