Glossary
This
glossary
defines
the
special
terms,
abbreviations,
and
acronyms
that
are
used
in
this
publication.
If
you
do
not
find
the
term
you
are
looking
for,
refer
to
the
index
or
to
the
Dictionary
of
Computing,
1994.
Numbers
2:1
compression.
The
relationship
between
the
quantity
of
data
that
can
be
stored
with
compression
as
compared
to
the
quantity
of
data
that
can
be
stored
without
compression.
In
2:1
compression,
twice
as
much
data
can
be
stored
with
compression
as
can
be
stored
without
compression.
A
A.
Ampere.
ac.
Alternating
current.
access
method.
A
technique
for
moving
data
between
main
storage
and
input
or
output
devices.
adapter
card.
A
circuit
board
that
adds
function
to
a
computer.
adj.
Adjustment.
AIX.
Advanced
Interactive
Executive.
IBM’s
implementation
of
the
UNIX
®
operating
system.
The
RS/6000
system,
among
others,
uses
AIX
as
it’s
operating
system.
alphanumeric.
Pertaining
to
a
character
set
that
contains
letters,
numerals,
and
usually
other
characters,
such
as
punctuation
marks.
alter.
To
change.
ambient
temperature.
The
temperature
of
air
or
other
media
in
a
designated
area,
particularly
the
area
surrounding
equipment.
ampere
(A).
A
unit
of
measure
for
electric
current
that
is
equivalent
to
a
flow
of
one
coulomb
per
second,
or
to
the
current
produced
by
one
volt
applied
across
a
resistance
of
one
ohm.
ANSI.
American
National
Standards
Institute.
archive.
To
collect
and
store
files
in
a
designated
place.
ASCII.
American
National
Standard
Code
for
Information
Interchange.
A
7
bit
coded
character
set
(8
bits
including
parity
check)
that
consists
of
control
characters
and
graphic
characters.
assigning
a
device
.
The
establishing
of
the
relationship
of
a
device
to
a
running
task,
process,
job,
or
program.
assignment.
The
naming
of
a
specific
device
to
perform
a
function.
asynchronous.
Pertaining
to
two
or
more
processes
that
do
not
depend
upon
the
occurrence
of
specific
events
such
as
common
timing
signals.
attention
(notice).
A
word
for
calling
attention
to
the
possibility
of
danger
to
a
program,
device,
or
system,
or
to
data.
Contrast
with
caution
and
danger
.
ATTN.
Attention.
B
backup.
To
make
additional
copies
of
documents
or
software
for
safekeeping.
bar
code.
A
code
representing
characters
by
sets
of
parallel
bars
of
varying
thickness
and
separation
which
are
read
optically
by
transverse
scanning.
bar
code
label.
Paper
bearing
a
bar
code
and
having
an
adhesive
backing.
The
bar
code
label
must
be
affixed
to
a
tape
cartridge
to
enable
the
library
to
identify
the
cartridge
and
its
volume
serial
number.
bar
code
reader.
A
laser
device
specialized
for
scanning
and
reading
bar
codes
and
converting
them
into
either
the
ASCII
or
EBCDIC
digital
character
code.
bezel.
Decorative
and
safety
cover.
bicolored.
Having
two
colors.
bit.
Either
of
the
digits
0
or
1
when
used
in
the
binary
numbering
system.
BM
or
bill
of
materials.
A
list
of
specific
types
and
amounts
of
direct
materials
expected
to
be
used
to
produce
a
given
job
or
quantity
of
output.
browser.
A
client
program
that
initiates
requests
to
a
Web
server
and
displays
the
information
that
the
server
returns.
buffer
.
A
routine
or
storage
used
to
compensate
for
a
difference
in
rate
of
flow
of
data
or
time
of
occurrence
of
events,
when
transferring
data
from
one
device
to
another.
©
Copyright
IBM
Corp.
2005
F-1
Summary of Contents for System Storage TS3310
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