Dell Precision 670 - Manual (Page 197)

Glossary: Dell Precision Workstation 470 and 670 Computers User's Guide
file:///T|/htdocs/systems/ws670/EN/ug_en/glossary.htm[3/20/2013 9:32:02 AM]
PXE — pre-boot execution environment — A WfM (Wired for Management) standard that allows networked computers that do
not have an operating system to be configured and started remotely.
Q
quick init — An array initialized using the Quick Init option is available immediately, with no on-going background controller
activity. All data written to an array that has been quick initialized is protected.
R
RAID — redundant array of independent disks — A method of providing data redundancy.
RAID 0 — A single level array consisting of two or more equal-sized segments residing on different drives. RAID 0 distributes
data evenly across its respective drives in equal-sized sections called stripes. RAID 0 arrays are not redundant.
RAID 1 — A single level array consisting of two equal-sized segments residing on two different drives. Provides redundancy
by storing identical copies on two drives.
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.
rebuild — Background regeneration of redundant data on a RAID 1.
redundant — The ability of an array to maintain operability when one or more hardware failures occur. RAID 1 is redundant.
In the event of the drive failure
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
ScanDisk — A Microsoft utility that checks files, folders, and the hard disk's surface for errors. ScanDisk often runs when you
restart the computer after it has stopped responding.
SDRAM — synchronous dynamic random-access memory — A type of DRAM that is synchronized with the optimal clock speed