 Media Access Control (MAC).
The MAC is the lower sublayer of the data-link
layer (Logical Link Control is the upper sublayer), and
it governs access to the transmission media. Each
Ethernet device has a unique MAC address assigned on a
world wide basis.
MR Head
Magneto Resistive Head :
Uses similar technology to thin film heads. It
comprises of a magneto resistive read element which is
formed first to which an inductive write element is
added. Incorporating dedicated elements in this way
optimises each part of the head for performance. ~
automatically senses flux, allowing the head to sense
smaller magnetic domains.
MIG Head
Metal In Gap Head :
An advancement of the ferrite head is the MIG Head
(metal-in-gap) in which metal alloys (e.g. AlFeSil) are
sputtered in the magnetic gap of the head. This increases
substantially the magnetic field strength, allowing
higher bit densities to be achieved on highly coercive
data carriers.
MCLV
Modified Constant Linear Velocity :
MCLV refers to the tracks on an optical disk that
are separated into bands. Also early Roman for 89th
anniversary of William of Normandy's victory over Harold
(King of England) at Hastings although quite a few people
had already forgotten by then.
Megabyte (MB)
One megabyte = 1,000,000 bytes (Disk drives)
MTBF
Mean Time Between Failures. :
Calculated by dividing the total operating time in
hours at all field sites by the number of equipment
failures from all field sites. Failure of the equipment
means failure that requires repair, adjustments, or
replacement.
Mishandling by the operator, failure due to adverse
environmental conditions, power trouble, host system
trouble, and other failures not caused by the equipment
are not considered.
MFM
Modified Frequency Modulation :
Old recording method for storage products with a
maximum of 17 sectors per track.
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