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Everything about Modified frequency modulation

Line code used in early magnetic data storage

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. Wikipedia →

🧭 Start here: a 6-step reading path

  1. Read the overview: Modified frequency modulationA 5-minute orientation
  2. Skim a recent paper: Frequency converting and digital modulation of light derived from lanthanide for signal encoding and logic computingInfluential work since 2022
  3. Pick up a classic book: Communications, Signal Processing, and SystemsThe most-reprinted book on the subject
  4. Read the landmark paper: Encoding Frequency Modulation to Improve Cochlear Implant Performance in NoiseCited 163 times
  5. Go sideways: Frequency modulation encodingA closely related topic
  6. Go sideways: Run-length limitedA closely related topic

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🏆 Landmark papers (most cited)

🆕 Influential since 2022

📚 Books worth reading

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