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166 Glossary
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expansion card — A circuit board that installs in an
expansion slot on the system board in some computers,
expanding the capabilities of the computer. Examples
include video, modem, and sound cards.
expansion slot — A connector on the system board (in
some computers) where you insert an expansion card,
connecting it to the system bus.
ExpressCard — A removable I/O card adhering to the
PCMCIA standard. Modems and network adapters are
common types of ExpressCards. ExpressCards support
both the PCI Express and USB 2.0 standard.
Express Service Code — A numeric code located on a
sticker on your Dell™ computer. Use the Express Service
Code when contacting Dell for assistance. Express Service
Code service may not be available in some countries.
extended display mode — A display setting that allows
you to use a second monitor as an extension of your
display. Also referred to as dual display mode.
extended PC Card — A PC Card that extends beyond the
edge of the PC Card slot when installed.
F
Fahrenheit — A temperature measurement scale
where 32° is the freezing point and 212° is the boiling
point of water.
FCC — Federal Communications Commission — A U.S.
agency responsible for enforcing communications-related
regulations that state how much radiation computers and
other electronic equipment can emit.
floppy — An electromagnetic form of storage media. Also
known as a floppy diskette or a floppy disk.
floppy drive — A disk drive that can read and write to
floppy disks.
folder — A term used to describe space on a disk or drive
where files are organized and grouped. Files in a folder can
be viewed and ordered in various ways, such as
alphabetically, by date, and by size.
format — The process that prepares a drive or disk for file
storage. When a drive or disk is formatted, the existing
information on it is lost.
FSB — front side bus — The data path and physical
interface between the processor and RAM.
FTP — file transfer protocol — A standard Internet
protocol used to exchange files between computers
connected to the Internet.
G
G — gravity — A measurement of weight and force.
GB — gigabyte — A measurement of data storage that
equals 1024 MB (1,073,741,824 bytes). When used to
refer to hard drive storage, the term is often rounded to
1,000,000,000 bytes.
GHz — gigahertz — A measurement of frequency that
equals one thousand million Hz, or one thousand MHz.
The speeds for computer processors, buses, and interfaces
are often measured in GHz.
graphics mode — A video mode that can be defined as x
horizontal pixels by y vertical pixels by z colors. Graphics
modes can display an unlimited variety of shapes and
fonts.
GUI — graphical user interface — Software that interacts
with the user by means of menus, windows, and icons.
Most programs that operate on the Windows operating
systems are GUIs.
H
hard drive — A drive that reads and writes data on a hard
disk. The terms hard drive and hard disk are often used
interchangeably.
heat sink — A metal plate on some processors that helps
dissipate heat.
help file — A file that contains descriptive or
instructional information about a product. Some help
files are associated with a particular program, such as Help
in Microsoft Word. Other help files function as stand-
alone reference sources. Help files typically have a
filename extension of .hlp or .chm.
hibernate mode — A power management mode that saves
everything in memory to a reserved space on the hard
drive and then turns off the computer. When you restart
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