Modified Frequency Modulation
<storage> (MFM, Modified FM, or sometimes "Multiple Frequency
Modulation") A modification to the original frequency modulation scheme for
encoding data on magnetic disks. MFM allows more than 1 symbol per flux
transition (up to 3), giving greater density of data. It is used with a data
rate of between 250-500 kbit/s on industry standard 3.5" and 5.25" low and high
density diskettes, and up to 5 Mbit/s on ST-506 hard disks. Except for 1.44 MB
floppy disks, this encoding is obsolete.
Other data encoding schemes include GCR, FM, RLL. See also: PRML.
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