Storage

Computer storage is the holding of data in an electromagnetic form for access by a computer processor.

FUNCTIONS OF COMPUTER STORAGE.
Computer storage is important to help users store programs and data to be used at a later time.It is also useful to keep current data while being processed by the processor until the information is saved in a storage media such as a hard disk or a diskette.Computer storage also stores instructions from a computer program.

TYPES OF COMPUTER STORAGE

Primary storage is known as the main memory of a computer, including RAM (Random-Access Memory)and ROM (Read-Only Memory). It is an internal memory (inside the CPU) that can be accessed directly
by the processor.
Secondary storage is the alternative storage in a
computer. It is an external storage that refers to various ways a computer can store program and data.

PRIMARY STORAGE
Primary storage is installed internally. Two main types of primary storage are RAM and ROM.
Data from RAM can be read or retrieved and written or stored during processing whereas data from ROM can just be read only.
RAM is volatile, which means the program and data will be lost when the
computer is turned off.
ROM is non-volatile which means it holds the programs and data even when the computer is turned off.
Many complex functions, such as translators for high-level languages and
operating systems are placed in primary storage.

volatile : The content is lost when a computer’s power is turned off.

Secondary storage is an alternative storage. It is very useful to store programs and data for future use. Secondary storage is required for two reasons.
1.The working memory of the CPU is limited in size and cannot always hold the amount of data required.
2.Data and programs in secondary storage do not disappear when the power is turned off.