Users Guide
Abbreviation for foot/feet.
FTP
Abbreviation for file transfer protocol.
g
Abbreviation for gram(s).
G
Abbreviation for gravities.
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
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