System memory is a storage media which stores data in form of binary digit (bit by Bit) into the system. The function of this part is to store different kinds of Files, Folders, and Programs, so they can be used further is future.
There are two types of memory used in a computer depending their method of stage and performance of data store:-
- Primary / Main Memory
- Secondary / Mass Memory.
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Primary Memory:-
Primary Memory is required to run different kinds of system files. Primary Memory is most for every computer system, so this way it also called as Main Memory. Primary memory holds only those data and instructions on which computer is currently working. It has limited capacity and data is lost when power is switched off.
Primary storage, also known as main storage or memory, is the area in a computer in which data is stored for quick access by the computer’s processor. The terms random access memory (RAM) and memory are often as synonyms for primary or main storage.
Primary memory is computer memory that a processor or computer accesses first or directly. It allows a processor to access running execution applications and services that are temporarily stored in a specific memory location. Primary memory is also known as primary storage or main memory. Mainly RAM and ROM comes under this.
RAM (Random Access Memory):-
RAM (random access memory) is the place in a computing device where the operating system (OS), application programs and data in current use are kept so they can be quickly reached by the device’s processor. RAM is much faster to read from and write to than other kinds of storage in a computer, such as a hard disk drive (HDD), solid-state drive (SSD) or optical drive. Data remains in RAM as long as the computer is running. When the computer is turned off, RAM loses its data. When the computer is turned on again, the OS and other files are once again loaded into RAM, usually from an HDD or SSD.
RAM is the internal memory of the CPU for storing data, program and program result. It is read and writes memory which stores data until the machine is working. As soon as the machine is switched off the data is erased. RAM is volatile; its means the data stored in it is lost when we switch off the computer or if there is a power failure.
RAM is two types:-
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SRAM (Static RAM):-
The word Static indicates that the memory retains its contents as long as power is being supplied. However, data is lost when the power gets down due to volatile nature. SRAM chaps used a matrix of 6 Transistors and no capacitors. Transistors do not require power to prevent leakage, so SRAM need not have to be refreshed on a regular basis. Because of the extra space in the matrix, SRAM uses more chips than DRAM for the same amount of storage space, thus making the manufacturing costs higher. So SRAM is used as cache memory and has very fast access.
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DRAM (Dynamic RAM):-
DRAM, unlike SRAM, must be continually refreshed in order to maintain the data. This is done by placing the memory on refresh circuit that rewrites the data several hundred times per second. DRAM is used for most system memory because it is cheap and small. All DRAM’s are made up of memory cells which are composed of one capacitor and one transistor.