Dell PowerEdge 4400 - Manual (Page 19)

GB
Abbreviation for gigabyte(s). A gigabyte equals 1024 megabytes or 1,073,741,824 bytes.
graphics coprocessor
See coprocessor .
graphics mode
See video mode .
guarding
A type of data redundancy that uses a set of physical drives to store data and a single, additional drive to store parity data. Data is protected from
the loss of a single drive. Guarding is sometimes preferred over mirroring because it is more cost-effective in systems with a very high storage
capacity. However, guarded configurations are significantly slower for applications that frequently write to the array, because each attempt to write
to the array requires multiple read and write commands to maintain the parity information. If this is a problem, mirroring or duplexing is a better
choice. See also
mirroring , RAID 4 , and RAID 5 .
GUI
Acronym for graphical user interface.
H
h
Abbreviation for hexadecimal. A base-16 numbering system, often used in programming to identify addresses in the computer's RAM and I/O
memory addresses for devices. The sequence of decimal numbers from 0 through 16, for example, is expressed in hexadecimal notation as: 0, 1,
2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10. In text, hexadecimal numbers are often followed by h or preceded by 0x. MS-DOS conventional memory
—
the first 640 KB of memory addresses —is from 00000h to 9FFFFh; the MS-DOS upper memory area—memory addresses between 640 KB and
1 MB —is from A0000h to FFFFFh.
heat sink
A metal plate with metal pegs or ribs that help dissipate heat. Some microprocessors include a heat sink.
HMA
Abbreviation for high memory area. The first 64 KB of extended memory above 1 MB. A memory manager that conforms to the XMS can make the
HMA a direct extension of conventional memory. See also
conventional memory , memory manager , upper memory area , and XMM .
host adapter
A host adapter implements communication between the computer's bus and the controller for a peripheral. (Hard-disk drive controller subsystems
include integrated host adapter circuitry.) To add a SCSI expansion bus to your system, you must install the appropriate host adapter.
HPFS
Abbreviation for the High Performance File System option in the Windows NT operating system.
Hz
Abbreviation for hertz.
I
I
2
0
Abbreviation for intelligent input/output.
IC
Abbreviation for integrated circuit.
ICMB
Abbreviation for inter-chassis management bus.