H
hertz
(Hz)
Unit
of
frequency.
One
hertz
equals
one
cycle
per
second.
hex
Hexadecimal.
High
Voltage
Differential
(HVD)
A
logic
signaling
system
that
enables
data
communication
between
a
supported
host
and
the
library.
HVD
signaling
uses
a
paired
plus
and
minus
signal
level
to
reduce
the
effects
of
noise
on
the
SCSI
bus.
Any
noise
injected
into
the
signal
is
present
in
both
a
plus
and
minus
state,
and
is
thereby
canceled.
Synonymous
with
differential
.
HVD
SCSI
Bus
High
Voltage
Differential
Hz
Hertz
(cycles
per
second).
I
IBM
Ultrium
Tape
Drive
Located
within
the
library,
a
data-storage
device
that
controls
the
movement
of
the
magnetic
tape
in
an
IBM
LTO
Ultrium
Tape
Cartridge.
The
drive
houses
the
mechanism
(drive
head)
that
reads
and
writes
data
to
the
tape.
ID
Identifier.
identifier
(ID)
(1)
In
programming
languages,
a
lexical
unit
that
names
a
language
object;
for
example,
the
names
of
variables,
arrays,
records,
labels,
or
procedures.
An
identifier
usually
consists
of
a
letter
optionally
followed
by
letters,
digits,
or
other
characters.
(2)
One
or
more
characters
used
to
identify
or
name
data
element
and
possibly
to
indicate
certain
properties
of
that
data
element.
(3)
A
sequence
of
bits
or
characters
that
identifies
a
program,
device,
or
system
to
another
program,
device,
or
system.
IML
Initial
microprogram
load.
initial
microprogram
load
(IML)
The
action
of
loading
a
microprogram
from
an
external
storage
to
writable
control
storage.
initiator
The
component
that
executes
a
command.
The
initiator
can
be
the
host
system
or
the
tape
control
unit.
INST
Installation.
interface
A
shared
boundary.
An
interface
might
be
a
hardware
component
to
link
two
devices
or
it
might
be
a
portion
of
storage
or
registers
accessed
by
two
or
more
computer
programs.
interposer
The
part
used
to
convert
a
68-pin
connector
to
a
50-pin
D-shell
connector.
intervention
required
Manual
action
is
needed.
INTRO
Introduction.
I/O
Input/output.
IOP
Input/output
processor.
Glossary
G-7
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