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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: A Modified Space Vector Modulation for DC-Side Current Ripple Reduction in High-Frequency Link Matrix ConverterInfluential work since 2022
  3. Pick up a classic book: Vacuum tubes in wireless communicationThe most-reprinted book on the subject
  4. Read the landmark paper: Advancing frequency locking: Modified FPGA-Guided direct modulation spectroscopy for laser stabilizationCited 8 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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