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).
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
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
unit
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,
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
executed
performs
a
preplanned
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.
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.
Glossary
G-9
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