308 Glossary
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product. Typically, readme files provide installation information and describe new
product enhancements or corrections that have not yet been documented.
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EAD-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.
• It is located on a network in a directory and the system administrator has
assigned rights only to specific individuals.
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EFRESH 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.
R
ESOLUTION — 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 turn off 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.
RTC — real time clock — Battery-powered clock on the system board that keeps
the date and time after you turn off the computer.
RTCRST — real time clock reset — A jumper on the system board that can often
be used for troubleshooting problems.
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SCANDISK — A Microsoft utility that checks files, folders, and the hard drive's
surface for errors. ScanDisk often runs after a lockup occurs.
SDRAM — synchronous dynamic random-access memory — A type of DRAM
that is synchronized with the optimal clock speed of the microprocessor.
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ERIAL CONNECTOR — An I/O port often used to connect devices such as a
handheld digital device or digital camera to your computer.
S
ERVICE 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 or technical support.
S
ETUP PROGRAM — A program that is used to install and configure hardware
and software. The setup.exe or install.exe program comes with most Windows
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