Dell PowerEdge 4400 User Manual
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RAID 10 is a mirroring technique in which data is duplicated across two identical RAID 0 arrays or hard-disk drives. All data on a physical drive in
one array is duplicated, or mirrored, on a drive in the second array. Mirroring offers complete redundancy of data for greater data security. See
also
,
RAM
Acronym for random-access memory. The computer's primary temporary storage area for program instructions and data. Each location in RAM is
identified by a number called a memory address. Any information stored in RAM is lost when you turn off your computer.
RAMDAC
Acronym for random-access memory digital-to-analog converter.
RCA
Acronym for Resource Configuration Add-in.
RCU
Acronym for Resource Configuration Utility.
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:
l
Its read-only attribute is enabled.
l
It resides on a physically write-protected diskette.
l
It is located on a network in a directory to which the system administrator has assigned read-only rights to you.
real mode
An operating mode supported by 80286 or higher microprocessors, real mode imitates the architecture of an 8086 microprocessor. Designed to
run in real mode, MS-DOS (unassisted by additional software techniques) can address only 640 KB of conventional memory.
refresh rate
The frequency, measured in Hz, at which the screen's horizontal lines are recharged. A monitor's refresh rate is also referred to as its vertical
frequency.
REN
Abbreviation for ringer equivalence number.
RFI
Abbreviation for radio frequency interference.
RGB
Abbreviation for red/green/blue.
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.
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.
S
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 to one SCSI interface.