Computer Memory


What is Computer Memory?

In computer, memory is referred to a tool that’s utilized to store data for immediate use during a PC. It regularly refers to semiconductor memory, explicitly metal–oxide–semiconductor (MOS) memory, where information is put away inside MOS memory cells on a silicon incorporated circuit chip. The term “memory” is regularly synonymous with the term, “primary storage”. PC memory works at a rapid, for instance, irregular access memory (RAM), as a qualification from capacity that gives moderate to-get to data, however, it offers higher limits. If necessary, the substance of the PC memory can be moved to optional capacity; an extremely basic method for doing this is through a memory the executives system called “virtual memory”. An obsolete equivalent word for memory is store.

What does it mean?

The term “memory”, signifying “primary storage” or “main memory”, is frequently connected with addressable semiconductor memory, for example incorporated circuits comprising of silicon-based MOS transistors, utilized for instance as essential stockpiling yet in addition different purposes in PCs and other advanced electronic gadgets. There are two principal sorts of semiconductor memory, unstable and non-unpredictable. Instances of non-unstable memory are streak memory (utilized as optional memory) and ROM, PROM, EPROM and EEPROM memory (utilized for putting away firmware, for example, BIOS). Instances of unpredictable memory are essential stockpiling, which is normally unique irregular access memory (DRAM), and quick CPU reserve memory, which is commonly static arbitrary access memory (SRAM) that is quick yet vitality devouring, offering lower memory areal thickness than DRAM.

Most semiconductor memory is sorted out into memory cells or bistable flip-flounders, each putting away one piece (0 or 1). Streak memory association incorporates both one piece for every memory cell and different bits per cell (called MLC, Multiple Level Cell). The memory cells are assembled into expressions of fixed word length, for instance, 1, 2, 4, 8, 16, 32, 64 or 128 piece. Each word can be gotten to by a twofold location of N bit, making it conceivable to store 2 brought by N words up in the memory. This suggests processor enrolls regularly are not considered as memory, since they just store single word and do exclude a tending to the system.

Common secondary storage devices are hard disk drives and solid-state drives.

Computer Memory

Memory is much the same as the human mind. It is utilized to store information and guidelines. PC memory is the extra room in the PC, where information is to be handled and guidelines required for preparing are put away. The memory is partitioned into a huge number of little parts called cells. Every area or cell has a remarkable location, which differs from zero to memory size less one. For instance, in the event that the PC has 64k words, at that point this memory unit has 64 * 1024 = 65536 memory areas. The location of these areas shifts from 0 to 65535.

Memory is principal of three sorts −

  • Cache Memory
  • Primary/Main Memory
  • Secondary Memory

Cache Memory

Cache memory is an exceptionally fast semiconductor memory which can accelerate the CPU. It goes about as a cushion between the CPU and the fundamental memory. It is utilized to hold those pieces of information and program which are most every now and again utilized by the CPU. The pieces of information and projects are moved from the plate to reserve memory by the working framework, from where the CPU can get to them.


The benefits of store memory are as per the following −

  • Cache memory is quicker than the primary memory.
  • It consumes less access time when contrasted with principle memory.
  • It stores the program that can be executed inside a brief timeframe.
  • Also, It stores information for temporary use.


The disadvantages of cache memory are as per the following −

  • Cache memory has restricted limits.
  • It is over the top expensive.

Primary Memory (Main Memory)

Primary memory holds just that information and directions on which the PC is as of now working. It has a restricted limit and information is lost when force is turned off. It is commonly comprised of semiconductor devices. These recollections are not as quick as registers. The information and guidance required to be handled lives in the primary memory. It is partitioned into two subcategories RAM and ROM.

Qualities of Main Memory

  • These are semiconductor recollections.
  • It is known as the fundamental memory.
  • Typically unpredictable memory.
  • Information is lost on the off chance that force is turned off.
  • It is the working memory of the computer.
  • Faster than secondary memories.
  • A computer can’t run without the primary memory.

Secondary Memory

This kind of memory is otherwise called external memory or non-volatile. It is slower than the primary memory. These are utilized for putting away information/data for all time. CPU straightforwardly doesn’t get to these memories; rather they are gotten to through info yield schedules. The substance of optional recollections is first moved to the principle memory, and afterward, the CPU can get to it. For instance, plate, CD-ROM, DVD, and so forth. The size of secondary memory varies according to the different classification of computers.

Features of Secondary Memory

  • These are magnetic and optical memories.
  • It is known as the backup memory.
  • It is a kind of non-volatile memory.
  • Information is forever put away regardless of whether power is turned off.
  • It is utilized for the capacity of information in a PC.
  • A computer may run without the auxiliary memory.
  • Slower than primary memory.



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