Computer memory

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Computer memory : 
Memory is the basic unit of a computer where it can store data and instructions.Based on the above-mentioned functions,storage units are classified as shown below:

MEMORY : 

1.Primary Memory: Primary memory is the main memory,which is the basic unit of all computers.It has a very fast access time and a smaller storage capacity with respect to the secondary memory of the system.This computer memory is accessed directly by the CPU.It includes several types of memory,such as the processor cache and system ROM.However,in most of the cases,primary memory refers to system RAM.
    exp. RAM,ROM

RAM (Random Access Memory) : RAM is the place in a computer where the operating system,application programs and data in current use are kept.These programs and data in current use are kept.These programs can be quickly reached by the computer's processor. RAM
 is small,both in physical size and the amount of data it can hold then the hard disk.

ROM (Read Only Memory) : In this memory,we can only read the existing data stored previously but can't Write on it.The programs stored are not erased, when the system is switched-off.So,sometimes it is also called as non-volatile memory.It mainly contains the BIOS(Basic Input Output System),the bootstrap loader, the CMOS (Complementary Metal Oxide Semiconductor) setup and the power-On self Test(POST).
        This type of memory lets you store the data needed to start up the computer.ROM can be of two types: PROM (Programmable ROM) and EPROM (Erasable Programmable ROM).

       

exp. Optical Disk,Pen Drive,Hard Disk

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