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154 Glossary
PXE — pre-boot execution environment — A WfM
(Wired for Management) standard that allows networked
computers that do not have an operating system to be
configured and started remotely.
R
RAID — redundant array of independent disks — A
method of providing data redundancy. Some common
implementations of RAID include RAID 0, RAID 1,
RAID 5, RAID 10, and RAID 50.
RAM — random-access memory — The primary
temporary storage area for program instructions and data.
Any information stored in RAM is lost when you shut
down your computer.
readme file — A text file included with a software package
or hardware product. Typically, readme files provide
installation information and describe new product
enhancements or corrections that have not yet been
documented.
read-only — Data and/or files you can view but cannot
edit or delete. A file can have read-only status if:
• It resides on a physically write-protected floppy disk,
CD, or DVD.
• It is located on a network in a directory and the
system administrator has assigned rights only to
specific individuals.
refresh rate — The frequency, measured in Hz, at which
your screen's horizontal lines are recharged (sometimes
also referred to as its vertical frequency). The higher the
refresh rate, the less video flicker can be seen by the
human eye.
resolution — The sharpness and clarity of an image
produced by a printer or displayed on a monitor. The
higher the resolution, the sharper the image.
RFI — radio frequency interference — Interference that
is generated at typical radio frequencies, in the range of
10 kHz to 100,000 MHz. Radio frequencies are at the
lower end of the electromagnetic frequency spectrum and
are more likely to have interference than the higher
frequency radiations, such as infrared and light.
ROM — read-only memory — Memory that stores data
and programs that cannot be deleted or written to by the
computer. ROM, unlike RAM, retains its contents after
you shut down your computer. Some programs essential to
the operation of your computer reside in ROM.
RPM — revolutions per minute — The number of
rotations that occur per minute. Hard drive speed is often
measured in rpm.
RTC — real time clock — Battery-powered clock on the
system board that keeps the date and time after you shut
down the computer.
RTCRST — real-time clock reset — A jumper on the
system board of some computers that can often be used
for troubleshooting problems.
S
ScanDisk — A Microsoft utility that checks files, folders,
and the hard disk’s surface for errors. ScanDisk often runs
when you restart the computer after it has stopped
responding.
SDRAM — synchronous dynamic random-access memory
— A type of DRAM that is synchronized with the optimal
clock speed of the processor.
serial connector — An I/O port often used to connect
devices such as a handheld digital device or digital camera
to your computer.
Service Tag — A bar code label on your computer that
identifies your computer when you access Dell Support at
support.dell.com or when you call Dell for customer
service or technical support.
setup program — A program that is used to install and
configure hardware and software. The setup.exe or
install.exe program comes with most Windows software
packages. Setup program differs from the system setup
program.
shortcut — An icon that provides quick access to
frequently used programs, files, folders, and drives. When
you place a shortcut on your Windows desktop and
double-click the icon, you can open its corresponding
folder or file without having to find it first. Shortcut icons
do not change the location of files. If you delete a