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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encoding is obsolete.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.
(2002-06-24)
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Nearby terms:
modem « MODEM7 « moderator « Modified Frequency Modulation » modifier » M O drive » MODSIM
This article was derived from the Free Online Dictionary of Computers and is available under ther terms of the GNU Free Documentation License.
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