Hard sectoring

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.

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

In older 8- and 5¹⁄₄-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 signal. Data read and write is faster in this technique than soft sectoring as no operations are to be performed regarding the starting and ending points of tracks.

Storage formats using hard sectoring

32 sector 8-inch floppy disks
10 sector and 16 sector 5¹⁄₄-inch floppy disks
Numerous magneto-optical formats
DVD-RAM

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References

This article incorporates public domain material from the General Services Administration document: "Federal Standard 1037C".

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