Definition of Memory:

Memory is an available space to store data.

Data:

Data is RAW facts and figures.

Memory:

It is available space to store data.

Purpose of Memory:

    The purpose of memory is to store data, and we use it whenever we need it.

Types of Memory:

(1)

Primary Memory
(2)

Secondary Memory
1. Primary Memory:

    Its nature is volatile means data is erased when electric power fails or the system is shut down.

i.    RAM (Random Access Memory):

  • It is limited memory
  • It is internal memory

Whenever processors perform any type of processing, the data perform is linked in RAM.

ii.    ROM (Read-only Memory):

  • Its nature is non-volatile.
  • It is the active memory of the computer.

In this part of memory, there are system files, which are most 
important for the system.

2. Secondary Memory:
    Secondary Memory is also called axillary memory or external memory.

  • Its nature is non-volatile.
  • Permanent storage memory.

Devices of Secondary Memory:

i.    Hard Disk:

  • It is a circular metallic plate.
  • Comparatively thick in size.
  • It can store a huge amount of data and faster access speed.

ii.    Flash Memory:

  • It is a partial memory.
  • We can store a huge amount of data.

iii.    Magnetic Tab:

    It is the oldest technique to store data permanently, in which data is stored in terms of blocks.

iv.    Optical Memory:

    It is an electronic Storge medium that uses a laser beam to store and retrieve data.

e.g. CD: Compact Disk          DVD: Digtal Vase Disk

Unit of memory:

Bit:       (Binary Digit) (Base Unit)

Byte:    (8 Bit=1 Byte)

K.B      (1K.B = 1024 Bytes)

M.B:    (1024 K.B = 1 M.B)

G.B:     (1024 M.B = 1 G.B)

T.B:     (1024 G.B = 1 T.B)