Glossary
112 Quantum LTO-7 HH SAS User’s Guide
master file A file used as an authority in a given job and that is
relatively permanent, even though its contents may change.
Synonymous with main file.
MB Mega Byte (usually expressed as data rate in MB/s or MB/
second).
m
edia 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 Q
uantum 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 which 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 un
it of length; equal to
approximately 39.37 inches.
micro One millionth of.
microcode (1) One or more micro instructions. (2) A code,
representing the instructions of an instruction set, 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, usu
ally to identify field replaceable units.
microdiagnostic utility A program that is run by the customer
engin
eer to test the machine.
microinstruction A basic or elementary machine instruction.
microprogram A group of microinstructions that when executed
performs a pre
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 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.
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