Research any topic before you write.

Find related topics. | Discover entities. | See connections. | Build a topical map.

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.

Data separator, Magnetic storage & Frequency modulation

Use the mouse wheel or two fingers (on touchscreens) to zoom in and out of the map.

Research this topic

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.

Explore this topic

Start with a few of the strongest sections from the source topic. These are research directions, not a list of keywords you must use.

Data separator

Integrated circuitClock recoveryWestern Digital FD1771IC manufacturingPhase-locked loop
5 related topics

Magnetic storage

Hard drivesMagnetic tapeRead/write head
3 related topics

Frequency modulation

Drive controller
1 related topics

MFM coding

NOR
1 related topics

Topics to explore

Browse the full topic structure. Each item opens a new analysis centered on that subject.

Overview

Magnetic storage

Frequency modulation

MFM coding

  • NOR Logical NOR

Data separator

Overall format

Advanced semantic analysis

Deeper signals for content research, entity SEO and topical coverage. The plain-language headings explain what each technical view is useful for.

Map overview Semantic statistics

Modified frequency modulation

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

How this topic connects Entity context

See the strongest relationship patterns around the current topic before diving into the raw triples.

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

Use these terms to understand the vocabulary surrounding the topic, not as a checklist for keyword stuffing.

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

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

Related concept clusters Concept neighborhoods

These clusters group vocabulary that occurs around closely connected concepts in the source material.

    Connections between topic areas Semantic bridges

    Bridges can reveal useful research angles that are easy to miss in a flat list of related terms.

    Min side: 3
    For writers, content strategists, SEOs, marketers and creators — from quick topic research to advanced semantic analysis.