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Glossary 207
read-only file
A read-only file is one that you are prohibited from
editing or deleting. A file can have read-only status if:
• Its read-only attribute is enabled.
• It resides on a physically write-protected diskette or
on a diskette in a write-protected drive.
• It is located on a network in a directory to which the
system administrator has assigned read-only rights
to you.
readme file
A text file included with a software package or hardware
product that contains information supplementing or
updating the documentation for the software or
hardware. Typically, readme files provide installation
information, describe new product enhancements or
corrections that have not yet been documented, and
list known problems or other things you need to be
aware of as you use the software or hardware.
real mode
An operating mode supported by 80286 or higher
microprocessors, real mode imitates the architecture of
an 8086 microprocessor.
refresh rate
The rate at which the monitor redraws the video image
on the monitor screen. More precisely, the refresh rate
is the frequency, measured in Hz, at which the 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. The
higher refresh rates are also noninterlaced.
RFI
Abbreviation for radio frequency interference.
RGB
Abbreviation for red/green/blue.
RIMM
Acronym for Rambus In-line Memory Module, which
is the Rambus equivalent of a DIMM module.
ROM
Acronym for read-only memory. Your computer
contains some programs essential to its operation in
ROM code. Unlike RAM, a ROM chip retains its
contents even after you turn off your computer.
Examples of code in ROM include the program that
initiates your computer's boot routine and the POST.
ROMB
Acronym for RAID on motherboard. When a RAID
controller is integrated into a computer’s system board,
the system has ROMB technology.
RPM
Abbreviation for revolutions per minute.
RTC
Abbreviation for real-time clock. Battery-powered
clock circuitry inside the computer that keeps the date
and time after you turn off the computer.
SAS
Acronym for Serial Attached SCSI.
SCA
Acronym for single connector attachment.
schema
A collection of class definitions that describes managed
objects in a particular environment. A CIM schema is
a collection of class definitions used to represent
managed objects that are common to every
management environment, which is why CIM is called
the Common Information Model.
SCSI
Acronym for small computer system interface. An I/O
bus interface with faster data transmission rates than
standard ports. You can connect up to seven devices
(15 for some newer SCSI types) to one SCSI interface.
SDMS
Abbreviation for SCSI device management system.
sec
Abbreviation for second(s).