Dell Dimension E521 Uživatelský manuál stáhnout pdf (Strana 146)

146 Glossary

bus — A communication pathway between the

components in your computer.

bus speed — The speed, given in MHz, that indicates how

fast a bus can transfer information.

byte — The basic data unit used by your computer. A byte

is usually equal to 8 bits.

C — Celsius — A temperature measurement scale where

0° is the freezing point and 100° is the boiling point of

water.

cache — A special high-speed storage mechanism which

can be either a reserved section of main memory or an

independent high-speed storage device. The cache

enhances the efficiency of many processor operations.

L1 cache — Primary cache stored inside the processor.

L2 cache — Secondary cache which can either be external

to the processor or incorporated into the processor

architecture.

carnet — An international customs document that

facilitates temporary imports into foreign countries. Also

known as a merchandise passport.

CD-R — CD recordable — A recordable version of a CD.

Data can be recorded only once onto a CD-R. Once

recorded, the data cannot be erased or written over.

CD-RW — CD rewritable — A rewritable version of a

CD. Data can be written to a CD-RW disc, and then

erased and written over (rewritten).

CD-RW drive — A drive that can read CDs and write to

CD-RW (rewritable CDs) and CD-R (recordable CDs)

discs. You can write to CD-RW discs multiple times, but

you can write to CD-R discs only once.

CD-RW/DVD drive — A drive, sometimes referred to as a

combo drive, that can read CDs and DVDs and write to

CD-RW (rewritable CDs) and CD-R (recordable CDs)

discs. You can write to CD-RW discs multiple times, but

you can write to CD-R discs only once.

clock speed — The speed, given in MHz, that indicates

how fast computer components that are connected to the

system bus operate.

COA — Certificate of Authenticity — The Windows

alpha-numeric code located on a sticker on your computer.

Also referred to as the Product Key or Product ID.

Control Panel — A Windows utility that allows you to

modify operating system and hardware settings, such as

display settings.

controller — A chip that controls the transfer of data

between the processor and memory or between the

processor and devices.

CRIMM — continuity rambus in-line memory module

— A special module that has no memory chips and is used

to fill unused RIMM slots.

cursor — The marker on a display or screen that shows

where the next keyboard, touch pad, or mouse action will

occur. It often is a blinking solid line, an underline

character, or a small arrow.

DDR SDRAM — double-data-rate SDRAM — A type of

SDRAM that doubles the data burst cycle, improving

system performance.

DDR2 SDRAM — double-data-rate 2 SDRAM — A type

of DDR SDRAM that uses a 4-bit prefetch and other

architectural changes to boost memory speed to over

400 MHz.

device — Hardware such as a disk drive, printer, or keyboard

that is installed in or connected to your computer.

device driver — See driver.

DIMM — dual in-line memory module — A circuit board

with memory chips that connects to a memory module on

the system board.

DIN connector — A round, six-pin connector that

conforms to DIN (Deutsche Industrie-Norm) standards;

it is typically used to connect PS/2 keyboard or mouse

cable connectors.

disk striping — A technique for spreading data over

multiple disk drives. Disk striping can speed up operations

that retrieve data from disk storage. Computers that use

disk striping generally allow the user to select the data

unit size or stripe width.

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