Operating instructions

Quick Launch menu A toolbar that enables you to launch commonly-used
programs with a single click.
QVGA Video display mode of 320 × 240.
RAID (redundant array of inexpensive devices) A way of creating a fault-
tolerant storage system. There are six levels. Level 0 uses byte-level striping and
provides no fault tolerance. Level 1 uses mirroring or duplexing. Level 2 uses
bit-level striping. Level 3 stores error-correcting information (such as parity) on
a separate disk, and uses data striping on the remaining drives. Level 4 is level 3
with block-level striping. Level 5 uses block level and parity data striping.
RAID-5 volume A striped set with parity. See also RAID (redundant array of
inexpensive devices).
RAM (random access memory) Memory that can be accessed at random,that
is, in which any memory address can be written to or read from without touch-
ing the preceding address. This term is often used to mean a computer’s main
memory.
RAMDAC (random access memory digital-to-analog converter) The circuitry
used on video cards that support analog monitors to convert the digital video
data to analog.
raster The horizontal pattern of lines that form an image on the moni-
tor screen.
RDRAM (Rambus DRAM) A patented RAM technology that uses accelerated
clocks to provide very high-speed memory.
read-only attribute A file attribute that does not allow a file to be altered or
modified. This is helpful when protecting system files that should not be edited.
real-time The processing of transactions as they occur rather than batching
them. Pertains to an application in which response to input is fast enough to af
-
fect subsequent inputs and guide the process, and in which records are updated
immediately. The lag from input time to output time must be sufficiently small
for acceptable timeliness. Timeliness is a function of the total system: missile
guidance requires output within a few milliseconds of input, scheduling of
steamships requires response time in days. Real-time systems respond in milli
-
seconds, interactive systems in seconds, and batch systems in hours or days.
56 MIKE MEYERS A+ CERTIFICATION PASSPORT
Passport / Mike Meyers‘ A+ Certification Passport / Meyers / 226308-3 / Glossary
P:\010Comp\Passport\308-3\gloss.vp
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