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H
head.
See drive head.
hertz (Hz).
A unit of frequency equal to one cycle per
second.
High Voltage Differential (HVD).
A logic signaling
system that enables data communication between a
supported server and another device, such as the 3580
Ultrium 2 Tape Drive. 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.
host .
The controlling or highest-level system in a data
communication configuration. Synonymous with server.
HVD.
High voltage differential.
Hz.
Hertz.
I
IBM Ultrium 2 Tape Drive.
Located within the IBM
3580 Tape Drive, a data-storage device that controls the
movement of the magnetic tape in an LTO Ultrium
Tape Cartridge. The drive houses the mechanism (drive
head) that reads and writes data to the tape. For
Models L23 and H23 of the IBM 3580 Tape Drive, the
native data capacity is 200 GB per cartridge; with 2:1
compression, its capacity is up to 400 GB.
ID.
Identifier.
insert.
Pertaining to the 3580 Ultrium 2 Tape Drive, to
place a tape cartridge into the tape drive.
install.
To set up for use or service. The act of adding
a product, feature, or function to a system or device
either by a singular change or by the addition of
multiple components or devices.
Internet.
The worldwide collection of interconnected
networks that use the Internet suite of protocols and
permit public access.
interposer.
An adapter-like device that allows a
connector of one size and style to connect to a mating
connector of a different type and style.
K
kg.
Kilogram.
kilogram (kg).
One thousand grams (approximately
2.2 pounds).
L
label.
A slip of paper with an adhesive backing that
can be written on and affixed to a tape cartridge as a
means of identification or description.
label area.
On the LTO Ultrium Tape Cartridge, a
recessed area next to the write-protect switch where a
label may be affixed.
LCD.
See liquid crystal display.
leader pin.
Within the LTO Ultrium Tape Cartridge, a
small metal column attached to the end of the magnetic
tape. During tape processing the leader pin is grasped
by a threading mechanism, which pulls the pin and the
tape out of the cartridge, across the drive head, and
onto a takeup reel. The head can then read or write
data from or to the tape.
LED.
Light-emitting diode.
light-emitting diode (LED).
A semiconductor chip
that gives off visible or infrared light when activated.
Used to illuminate the single-character display on the
3580 Ultrium 2 Tape Drive.
Linear Tape-Open (LTO).
A type of tape storage
technology developed by the IBM Corporation,
Hewlett-Packard, and Seagate. LTO technology is an
“open format” technology, which means that its users
will have multiple sources of product and media. The
“open” nature of LTO technology enables compatibility
between different vendors’ offerings by ensuring that
vendors comply with verification standards. The LTO
technology is implemented in two formats: the Accelis
format focuses on fast access; the Ultrium format
focuses on high capacity. The Ultrium format is the
preferred format when capacity (rather than fast access)
is the key storage consideration. An Ultrium 2 cartridge
has a compressed data capacity of up to 400 GB (at 2:1
compression) and a native data capacity of up to 200
GB. The Ultrium format is designed with a
4-generation road map that provides for up to 1.6 TB
per cartridge (at 2:1 compression) in Generation 4, with
a compressed transfer rate of up to 320 MB per second.
liquid crystal display (LCD).
A low-power display
technology used in computers and other I/O devices.
load.
Following insertion of a tape cartridge into a
tape drive, the act (performed by the tape drive) of
positioning the tape for reading or writing by the drive
head.
load and unload cycle.
The act of inserting a cartridge
into a tape drive, loading the tape to load point,
rewinding the tape into the cartridge, and ejecting the
cartridge from the drive.
Low Voltage Differential (LVD).
A low-noise,
low-power, and low-amplitude electrical signaling
Glossary
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