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170 Glossary
PS/2 — personal system/2 — A type of connector for attaching a PS/2-compatible
keyboard, mouse, or keypad.
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.
book.book Page 170 Tuesday, July 3, 2007 12:31 PM