Changes

This constant clock pulse ensures that the floppy disk controller (FDC) always knows where each bit begins and ends. Essentially, for every bit of information written to the disk, there’s always one clock signal and, if the data is a 1, a data signal as well.

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This method dramatically reduces the number of transitions compared to FM. Additionally, when a 0 follows a 1, no transition is needed, further minimizing the number of magnetic changes.

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