Dell Latitude ATG D620 User Manual page 204

Glossary: Dell Latitude ATG D620 User's Guide
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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.
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