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Glossary 143
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.
CMOS — A type of electronic circuit. Computers use a small amount of battery-
powered CMOS memory to hold date, time, and system setup options.
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.
Consumer IR Port— A port on the front of the computer that allows certain software
applications to be controlled by the Dell Travel Remote in some systems. In other
systems, this port allows you to transfer data between the computer and infrared-
compatible devices without using a cable connection.
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.
D
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.
Dell Travel Remote— A small remote control stored in the portable computer’s
ExpressCard slot which provides simple functionality for enjoying multimedia
content.
book.book Page 143 Wednesday, December 12, 2007 10:32 AM