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Modified frequency modulation

Modified frequency modulation (MFM) is a run-length limited (RLL) line code used to encode data on most floppy disks and some hard disk drives. It was first introduced on hard disks in 1970 with the IBM 3330 and then in floppy disk drives beginning with the IBM 53FD in 1976.

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Data separator, Magnetic storage & Frequency modulation

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Explore the main themes, entities and connections around Modified frequency modulation. Start with the topic map, then use the sections below for research and deeper semantic analysis.

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Data separator

5 related topics

Magnetic storage

3 related topics

Frequency modulation

1 related topics

MFM coding

1 related topics

Topics to explore

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Overview

Magnetic storage

Frequency modulation

MFM coding

  • NOR Logical NOR

Data separator

Overall format

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Modified frequency modulation

Nodes26
Edges25
Triples13
Avg. degree1.92
Density0.076923
Components1

How this topic connects Entity context

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Modified frequency modulation

Top relations

related to MFM coding · 7
Modified frequency modulation → FM, MFM, Modified, NOR, On, The, Unlike FM
related to MMFM · 6
Modified frequency modulation → In, M2FM, MFM, MMFM, M²FM, RLL

Important terminology Word statistics

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Important terminology

data mfm clock encoding fm disk used magnetic frequency modulation bit code bits original signal first media one drives disks

Entity relationships Subject–Predicate–Object triples

Extracted RDF-like relationships with confidence and source. The table includes structured facts and lower-confidence contextual relations.
SubjectPredicateObjectConfidenceSrc
Modified frequency modulationrelated to MFM codingModified0.60section
Modified frequency modulationrelated to MFM codingUnlike FM0.60section
Modified frequency modulationrelated to MFM codingOn0.60section
Modified frequency modulationrelated to MFM codingMFM0.60section
Modified frequency modulationrelated to MFM codingFM0.60section
Modified frequency modulationrelated to MFM codingThe0.60section
Modified frequency modulationrelated to MFM codingNOR0.60section
Modified frequency modulationrelated to MMFMMMFM0.60section
Modified frequency modulationrelated to MMFMM²FM0.60section
Modified frequency modulationrelated to MMFMM2FM0.60section
Modified frequency modulationrelated to MMFMMFM0.60section
Modified frequency modulationrelated to MMFMRLL0.60section

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