firmware.
The proprietary code that is usually
delivered as part of an operating system.
Firmware is more efficient than software
that is loaded from an alterable medium,
and is more adaptable to change than
pure hardware circuitry. An example of
firmware is the Basic Input/Output
System (BIOS) in read-only memory
(ROM) on a PC motherboard.
G
GB. See gigabyte.
Generation 1.
The informal name for the Ultrium tape
drive, which is the predecessor of the tape
drive (Generation 2). The Generation 1
drive has a native storage capacity of up
to 100 GB per cartridge and a native
sustained data transfer rate of 15 MB per
second.
Generation 2.
The informal name for the Ultrium 2 Tape
Drive, which is the second-generation
version of the Ultrium tape drive
(Generation 1). The Generation 2 drive
has a native storage capacity of up to 200
GB per cartridge and a native sustained
data transfer rate of 35 MB per second.
Generation 3.
The informal name for the Ultrium 3 Tape
Drive, which is the third-generation
version of the Ultrium tape drive
(Generation 1, 2). The Generation 3 drive
has a native storage capacity of up to 400
GB per cartridge and a native sustained
data transfer rate of 80 MB per second.
Generation 4.
The informal name for the Ultrium 4 Tape
Drive, which is the fourth-generation
version of the Ultrium tape drive
(Generation 1, 2, 3). The Generation 4
drive has a native storage capacity of up
to 800 GB per cartridge and a native
sustained data transfer rate of 120 MB per
second.
Generation 5.
The informal name for the Ultrium 5 Tape
Drive, which is the fifth-generation
version of the Ultrium tape drive
(Generation 1, 2, 3, 4). The Generation 5
drive has a native storage capacity of up
to 1500 GB per cartridge and a native
sustained data transfer rate of 140 MB per
second.
Generation 6.
The informal name for the Ultrium 6 Tape
Drive, which is the sixth-generation
version of the Ultrium tape drive
(Generation 1, 2, 3, 4, 5). The Generation 6
drive has a native storage capacity of up
to 2500 GB per cartridge and a native
sustained data transfer rate of 160 MB per
second.
Generation 7.
The informal name for the
seventh-generation version of the Ultrium
Tape Drive. The Generation 7 drive has a
native storage capacity of up to 6000 GB
per cartridge and a native sustained data
transfer rate of 300 MB per second.
gigabyte.
1,000,000,000 bytes.
ground.
An object that makes an electrical
connection with the earth.
H
hardware.
The physical equipment or devices that
form a computer.
head. See drive head.
Head Resistance Measurements test.
Part of the Test Head diagnostic, a
procedure that determines whether the
tape drive's head works correctly. The test
measures the head's ability to withstand
cracks and other defects.
host. The controlling or highest-level system in
a data communication configuration.
Synonymous with server.
I
ID. Identifier.
in. See inch.
inch. A unit of length equal to 1/36 yard or
25.4 mm.
input/output (I/O)
Data that is provided to a computer or
data that results from computer
processing.
Glossary 59
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