bus.
A
facility
for
transferring
data
between
several
devices
located
between
two
end
points,
only
one
device
being
able
to
transmit
at
a
given
moment.
byte.
A
string
consisting
of
a
certain
number
of
bits
(usually
8)
that
are
treated
as
a
unit
and
represent
a
character.
A
fundamental
data
unit.
C
capacity.
The
amount
of
data
that
can
be
contained
on
storage
media
and
expressed
in
bytes
of
data.
cartridge
manual
rewind
tool.
A
device
that
can
be
fitted
into
the
reel
of
a
cartridge
and
used
to
rewind
tape
into
or
out
of
the
cartridge.
cartridge
storage
slot.
Individual
slot
located
within
a
magazine
that
is
used
to
house
tape
cartridges.
caution
(notice)
.
A
word
to
call
attention
to
possible
personal
harm
to
people.
Contrast
with
attention
and
danger
.
CE.
Customer
engineer;
field
engineer;
service
representative.
centimeter
(cm).
One
one-hundredth
of
a
meter
(0.01
m).
Approximately
0.39
inch.
channel
command
.
An
instruction
that
directs
a
data
channel,
control
unit,
or
device
to
perform
an
operation
or
set
of
operations.
char.
Character.
CHK.
Check.
cleaning
cartridge.
A
tape
cartridge
that
is
used
to
clean
the
heads
of
a
tape
drive.
Contrast
with
data
cartridge
.
command.
A
control
signal
that
initiates
an
action
or
the
start
of
a
sequence
of
actions.
compact
disc
(CD).
A
disc,
usually
4.75
inches
in
diameter,
from
which
data
is
read
optically
by
means
of
a
laser.
compression.
The
process
of
eliminating
gaps,
empty
fields,
redundancies,
and
unnecessary
data
to
shorten
the
length
of
records
or
blocks.
concurrent.
Refers
to
diagnostic
procedures
that
can
be
run
on
one
control
unit
while
the
rest
of
the
subsystem
remains
available
for
customer
applications.
contingent
connection.
A
connection
between
a
channel
path
and
a
drive
caused
when
a
unit
check
occurs
during
an
I/O
operation.
controller.
A
device
that
provides
the
interface
between
a
system
and
one
or
more
tape
drives.
CP.
Circuit
protector.
ctrl.
Control.
CU.
Control
unit.
D
danger
(notice).
A
word
to
call
attention
to
possible
lethal
harm
to
people.
Contrast
with
attention
and
caution
.
data.
Any
representations
such
as
characters
or
analog
quantities
to
which
meaning
is
or
might
be
assigned.
data
buffer.
The
storage
buffer
in
the
control
unit.
This
buffer
is
used
to
increase
the
data
transfer
rate
between
the
control
unit
and
the
channel.
data
cartridge.
A
tape
cartridge
dedicated
to
storing
data.
Contrast
with
cleaning
cartridge
.
data
check.
A
synchronous
or
asynchronous
indication
of
a
condition
caused
by
invalid
data
or
incorrect
positioning
of
data.
dc.
Direct
current.
degauss.
To
make
a
magnetic
tape
nonmagnetic
by
means
of
electrical
coils
carrying
currents
that
neutralize
the
magnetism
of
the
tape.
degausser.
A
device
that
makes
magnetic
tape
nonmagnetic.
degradation
.
A
decrease
in
quality
of
output
or
throughput
or
an
increase
in
machine
error
rate.
degraded.
Decreased
in
quality
of
output
or
throughput
or
increased
machine
error
rate.
deserialize.
To
change
from
serial-by-bit
to
parallel-by-byte.
detented.
A
part
being
held
in
position
with
a
catch
or
lever.
device.
Any
hardware
component
or
peripheral,
such
as
a
tape
drive
or
tape
library,
that
can
receive
and
send
data.
device
driver.
A
file
that
contains
the
code
needed
to
use
an
attached
device.
DIAG
.
Diagnostic
section
of
maintenance
information
manual.
differential.
See
High
Voltage
Differential
(HVD)
.
direct
access
storage.
A
storage
device
in
which
the
access
time
is
independent
of
the
location
of
the
data.
download.
(1)
To
transfer
programs
or
data
from
a
computer
to
a
connected
device,
typically
a
personal
F-2
TS3310
Tape
Library
Setup
and
Operator
Guide
Summary of Contents for System Storage TS3310
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