Dell POWEREDGE 4300 - Page 143

Glossary 7
Microsoft Windows NT
®
operating sys-
tem can optionally use a FAT file system
structure.
)&&
Abbreviation for Federal Communications
Commission.
IODVKPHPRU\
A type of EEPROM chip that can be re-
programmed from a utility on diskette
while still installed in a computer; most
EEPROM chips can only be rewritten with
special programming equipment.
IRUPDW
To prepare a hard-disk drive or diskette for
storing files. An unconditional format de-
letes all data stored on the disk. The
format command in MS-DOS 5.0 or higher
includes an option that allows you to unfor-
mat a disk if you have not yet used the disk
for file storage.
IW
Abbreviation for foot/feet.
)73
Abbreviation for file transfer protocol.
J
Abbreviation for gram(s).
*
Abbreviation for gravities.
*%
Abbreviation for gigabyte(s). A gigabyte
equals 1024 megabytes or 1,073,741,824
bytes.
JUDSKLFVFRSURFHVVRU
See coprocessor.
JUDSKLFVPRGH
See video mode.
JXDUGLQJ
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 con-
figurations 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 informa-
tion. If this is a problem, mirroring or
duplexing is a better choice. See also
mirroring, RAID 4, and RAID 5.
*8,
Acronym for graphical user interface.
K
Abbreviation for hexadecimal. A base-
16 numbering system, often used in
programming to identify addresses in the
computer’s RAM and I/O memory ad-
dresses for devices. The sequence of
decimal numbers from 0 through 16, for
example, is expressed in hexadecimal no-
tation as: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B,
C, D, E, F, 10. In text, hexadecimal num-
bers 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 be-
tween 640 KB and 1 MB—is from A0000h
to FFFFFh.
KHDWVLQN
A metal plate with metal pegs or ribs
that help dissipate heat. Some micro-
processors include a heat sink.
+0$
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.
KRVWDGDSWHU
A host adapter implements communica-
tion 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 ex-
pansion bus to your system, you must
install the appropriate host adapter.
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