master file
A file that is used as an authority in a job and that is relatively permanent, even though its
contents might change. Synonymous with main file.
Maximum Transmission Unit (MTU)
The size of the largest packet that a network protocol can transmit.
MB Megabyte (expressed as data rate in MB/s or MB/second).
media capacity
The amount of data that can be contained on a storage medium, expressed in bytes of data.
media-type identifier
Pertaining to the bar code on the bar code label of the IBM Ultrium Tape Cartridge, a 2-character
code, L1, that represents information about the cartridge. L identifies the cartridge as one that can
be read by devices that incorporate LTO technology; 1 indicates that it is the first generation of its
type.
mega One million of.
meter In the Metric System, the basic unit of length; equal to approximately 39.37 inches.
MIB Management Information Base. Information repository that is used by SNMP.
micro One millionth of.
microcode
(1) One or more micro instructions. (2) A code, representing the instructions of an instruction set,
which is implemented in a part of storage that is not program-addressable. (3) To design, write,
and test one or more micro instructions. (4) See also microprogram.
microdiagnostic routine
A program that runs under the control of a supervisor, usually to identify field replaceable units.
microdiagnostic utility
A program that is run by the customer engineer to test the machine.
microinstruction
A basic or elementary machine instruction.
microprogram
A group of microinstructions that when run performs a planned function.
The term microprogram represents a dynamic arrangement or selection of one or more groups of
microinstructions for execution to perform a particular function. The term microcode represents
microinstructions that are used in a product as an alternative to hard-wired circuitry to
implement certain functions of a processor or other system component.
MIM Media information message.
mm Millimeter.
modifier
That which changes the meaning.
mount a device
To assign an I/O device with a request to the operator.
MP Microprocessor.
ms Millisecond.
MSG Message.
multipath
Pertaining to using more than one path.
Glossary 247
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