Dell PowerEdge 1400, User Manual

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support.dell.com Glossary 7
can optionally use a FAT file system
structure.
&
Abbreviation for Federal Communications
Commission.
A type of EEPROM chip that can be repro-
grammed from a utility on diskette while
still installed in a computer; most EE-
PROM chips can only be rewritten with
special programming equipment.
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 un-
format a disk if you have not yet used the
disk for file storage.
Abbreviation for foot/feet.
&"
Abbreviation for file transfer protocol.
Abbreviation for gram(s).
)
Abbreviation for gravities.
)
Abbreviation for gigabyte(s). A
gigabyte equals 1024 megabytes or
1,073,741,824 bytes.
See coprocessor.
See video mode.
A type of data redundancy that uses a set
of physical drives to store data and a sin-
gle, 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 mir-
roring, RAID 4, and RAID 5.
)#
Acronym for graphical user interface.
Abbreviation for hexadecimal. A base-16
numbering system, often used in pro-
gramming 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
between 640 KB and 1 MB—is from
A0000h to FFFFFh.
A metal plate with metal pegs or ribs that
help dissipate heat. Some microproces-
sors include a heat sink.
+(
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 man-
ager, upper memory area, and XMM.
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.