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Glossary
5.375 x 8.375 ver 2.3.2
L2 (level two) cache — Memory cache installed on the
motherboard to help improve processing speed. It is slower than
L1 cache and faster than main memory. See also cache, CPU
cache, L1 cache.
LAN (local area network) — A group of computers or other
devices dispersed over a relatively limited area and connected by
a communications link that enables any device to interact with
any other on the network.
liquid crystal display (LCD) — A type of display that uses a
liquid substance between two transparent electrode panels. When
an electric current passes through the electrodes, the molecules in
the liquid form a crystalline pattern that polarizes the light
passing through it. A filter over the electrodes permits only non-
polarized light to pass to the surface of the display, creating light
and dark pixels.
load — To move information from a storage device (such as a hard
disk) into memory for processing.
local area network — See LAN.
logical drive — A section of a disk that is recognized by the
operating system as a separate disk drive. A system’s logical
drives may differ from its physical drives. For example, a single
hard disk drive may be partitioned into two or more logical
drives.
M
megabyte (MB) — A unit of data equal to 1,048,576 bytes
(1024 x 1024 bytes). See also bytes.
memory — Typically refers to the computer’s main memory,
where programs are run and data is temporarily stored and
processed. Memory can be volatile and hold data temporarily,
such as RAM, or it can be nonvolatile and hold data permanently,
such as ROM. A computer’s main memory is RAM. See RAM,
ROM.
microprocessor — See central processing unit (CPU).