Computer - Memory

Memory is like a human brain. It is used for storing data and instructions. Computer memory is a memory space of the computer, where the data is to be processed and the desired storage location of the process instruction. The memory is divided into a large number of small parts called cells. Each location has a unique address or cell varies from zero to the memory size minus 1. For example, if your computer has 64K words, then the storage unit has 64 * 1024 = 65536 memory location. Address these places, from 0 to 65535.

Three main types of memory is

Cache
Main memory / main memory
Auxiliary storage

Cache
Cache memory is a semiconductor memory of a very high speed, which can speed up the CPU. It is as a buffer between the CPU and main memory. It is used to store data and programs, which are those parts of the CPU of the most frequently used. Each part of the data and procedures from the disk is transferred to the cache memory by the operating system, CPU can access them from there.

Main memory (main memory)

The main memory to store data and instructions only working properly which computer. It has a capacity limit, and when the power is turned OFF data loss. It generally consists of a semiconductor device. These memories are not as fast as registers. Data and instructions to be processed resides in main memory. It is divided into two sub-RAM and a ROM.

Auxiliary storage

This type of memory is also called external memory or non-volatile. It is slower than main memory. These are used to permanently store data / information. CPU does not access directly the opposite of these memories, they are accessed through the input and output process. Two memory contents is first transferred to the main memory, the CPU can then access it. For example: disk, CD-ROM, DVD and so on.