Memory & It’s Types

 

Memory & It’s Types

What is Memory- Memory should be explained as a physical device which is used to store files in a specific location of computer. The files should be anything (data, images, songs, videos, movies, programs). The files saved in the memory of computer should be in two methods.

1.    Temporary Basis

2.    Permanent Basis

Bit- The smallest unit located in a computer memory section is known as bit. This is also termed as the shortest form of Binary Digit.

The memory located in a computer is basically of two types:

(i)            Temporary Basis Memory: - As the name indicates it should be defined as a memory which is primarily used for the processing of the instructions and information’s, data, programs given by the computer and after processing it should be stored in the internal memory of computer also. The capacity of this memory is very less and speed is very fast. It is a volatile memory. The information should be lost by switching off the computer. It is based on metal oxide semi conductor that’s why it is also called as semi conductor memory. It is of two types:

(1.)          Volatile Memory: - Volatile memory is the memory which always requires regular power supply to store the data processed by it. If the power supply is turned off than the data should be lost forever. So it is also called as temporary memory. It is of two types:

(I)           Random Access Memory (RAM): - The data and information should be temporary stored in this memory before processing. It should be measured in Giga Byte. Examples of RAM are: DDR-1, DDR-2. There are two types of RAM:

RAM

(i)            Dynamic RAM (DRAM): - Power supply is regularly given to this memory but after a regular power supply the data stored in this memory for a specific time only and after the time finished the data should be lost. It needs less power and cheaper also in comparison to other memory.

(ii)         Static RAM (SRAM): - If the power supply is turned off than the data should be lost. It stores less data in comparison to DRAM but the speed of processing data is faster in comparison to DRAM and it is costlier than DRAM.

(ii) Permanent Basis Memory: - It is also defined as the Non Volatile Memory. It is a permanent memory. When the power supply is off it does not effect to the permanent memory. There is only one type of permanent memory.

(1.)        Read Only Memory (ROM): - As the name implies it is only read only memory in which written data or information should be remain permanent. ROM can be classified into three parts:

(I.)                   Programmable Read Only Memory: - It is a very special and unique type of ROM in which user can write data through a special operation and after the writing of data work is completed it should behaves like a normal RAM.

(II.)               Erasable PROM: - With the help of ultra violet rays old program written on the memory should be permanently erased and a new program written in place of the old program.

(III.)            Electrically Erasable PROM: - In this data should be erased with the help of very high voltage electric current/ pulse. It is mostly used in the research and scientific works and experiments.