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- Created 2012-03-15
refers to the physical devices used to store programs (sequences of instructions) or data (e.g. program
) on a temporary or permanent basis for use in a
device. The term
is used for the information in physical systems which function at high-speed (i.e.
), as a distinction from
, which are physical devices for
program and data storage
which are slow to access but offer higher memory capacity. Primary memory stored on secondary memory is called "
". An archaic synonym for memory is
The term "memory", meaning
is often associated with addressable
s, used for example as
but also other purposes in computers and other
There are two main types of semiconductor memory:
. Examples of
(sometimes used as secondary, sometimes primary computer memory) and
memory (used for
such as boot programs). Examples of
(typically dynamic RAM,
), and fast
memory (typically static RAM,
, which is fast but energy-consuming and offer lower memory capacity per area unit than DRAM).
Most semiconductor memory is organized into
or bistable flip-flops, each storing one
(0 or 1).
organization includes both one bit per memory cell and multiple bits per cell (called MLC, Multiple Level Cell). The memory cells are grouped into words of fixed
, for example 1, 2, 4, 8, 16, 32, 64 or 128 bit. Each word can be accessed by a binary address of
bit, making it possible to store 2 raised by
words in the memory. This implies that
s normally are not considered as memory, since they only store one word and do not include an addressing mechanism.
is often used to describe
such as tape,
disks and optical discs (
from Wikipedia (last updated: 30 November), licensed under
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