Dell TL2000 User Manual
Page 250
beginning
of
tape.
It
means
that
policy
is
determined
on
writes
at
LB
(logical
block)
zero
(the
first
block
in
the
partition).
Appending
to
a
tape
[or
overwriting
at
a
non-zero
LB]
does
not
change
the
policy
already
in
use
for
that
tape.
Border
Gateway
Protocol
(BGP).
BGP
is
the
core
routing
protocol
of
the
Internet.
It
works
by
maintaining
a
table
of
IP
networks
or
’prefixes’
which
designate
network
reachability
among
autonomous
systems
(AS).
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.
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
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.
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.
control
path
drive.
A
drive
that
communicates
messages
from
the
host
computer
to
the
library
in
which
the
drive
is
installed.
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.
DCS.
Designated
Cleaning
Slot
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.
Density
reporting.
This
setting
determines
whether
the
drive
shows
or
masks
encryption.
This
settings
H-2
Dell
PowerVault
TL2000
Tape
Library
and
TL4000
Tape
Library
User's
Guide