Dell Latitude D620 User Manual page 167

Glossary: Dell Latitude D620 User's Guide
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
SAS serial attached SCSI A faster, serial version of the SCSI interface (as opposed to the original
SCSI parallel architecture).
SATA serial ATA A faster, serial version of the ATA (IDE) interface.
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