MFM encoding - ορισμός. Τι είναι το MFM encoding
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Τι (ποιος) είναι MFM encoding - ορισμός

ENCODING IN COMMUNICATION TECHNOLOGY
Delay encoding; Miller code; Miller encoding; MMFM; Miller coding; Modified Modified Frequency Modulation; M2FM; M²FM; Miller sub-carrier coding; Miller subcarrier coding; Miller encoded subcarrier; Miller encoded sub-carrier; Miller sub-carrier code; Miller subcarrier code; Delay coding; MFM (encoding); FM (encoding); Digital FM; Delay code; Modified modified frequency modulation; MMFM (encoding); FM line code; Modified modified FM; Modified squared FM; Modified squared frequency modulation; Intel MMFM; Intel M²FM; Intel M2FM; ISBC MMFM; ISBC M²FM; ISBC M2FM; ISIS MMFM; ISIS M²FM; ISIS M2FM; Intel Modified Modified Frequency Modulation; Intel Modified modified frequency modulation; Miller Code; Modified Frequency Modulation; MFM encoding; Data separator
  • A byte encoded using FM (above) and MFM (below). Dashed blue line denotes clock pulse (the signal level change in it is ignored), and dashed red line, data pulse (signal level change encodes 1, and absence thereof, 0).

Encoding (memory)         
  • Early LPT Mechanism
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MEMORY PROCESS
Encoding (Memory); Memory encoding; Computational models of memory encoding
Memory has the ability to encode, store and recall information. Memories give an organism the capability to learn and adapt from previous experiences as well as build relationships.
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 Except for 1.44 MB floppy disks, this encoding is obsolete.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)
Modified frequency modulation         
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.

Βικιπαίδεια

Modified frequency modulation

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.

MFM is a modification to the original frequency modulation encoding (FM) code specifically for use with magnetic storage. MFM allowed devices to double the speed data was written to the media as the code guaranteed only one polarity change per encoded data bit. For this reason, MFM disks are typically known as "double density" while the earlier FM became known as "single density".

MFM is used with a data rate of 250–500 kbit/s (500–1000 kbit/s encoded) on industry-standard 5+14-inch and 3+12-inch ordinary and high-density floppy diskettes. MFM was also used in early hard disk designs, before the advent of more efficient types of RLL codes. Outside of niche applications, MFM encoding is obsolete in magnetic recording.