Difference between primary Memory and secondary Memory

Difference between primary Memory and secondary Memory:: We know the Memory of a computer as two categories, such as primary Memory and Secondary Memory. We know the primary Memory as the main memory of the machine.

 It helps the users to give recent data very fast. We know the secondary Memory of the computer as the auxiliary memory.  Here, the computer stores all the data permanently. 

But when you want to make your doubts clear, you need to understand the difference between primary Memory and Secondary Memory.

The fundamental or critical difference between primary and secondary memory is that you can directly access the primary Memory by CPU. Still, you can’t directly access the secondary Memory to the CPU.

In this article, we will discuss some more differences between Primary and Secondary Memory. The comparison chart shows you the critical difference between these two.

Difference between primary Memory and secondary Memory

Difference between primary Memory and secondary Memory
Difference between primary Memory and secondary Memory

∆Definition of Primary Memory

This Memory is the main memory of the computer system. The instructions that currently need to be executed directly copied to the primary Memory. CPU can directly access the information from the primary Memory. 

When you want to access the data from primary Memory, the process becomes very faster. It is because this Memory is internal Memory.  The Processor can also access the data from primary Memory using the data bus.

Primary Memory is volatile. It means that the data in primary Memory does not exist if the user doesn’t save it. As a result, sometimes, a power failure occurs. Semiconductors are used to make the primary Memory. The cost of primary Memory is very high. The size of the Memory is small.

Important link – Difference between rows and columns

Types of primary Memory

Primary Memory is of two types that are RAM (Random Access Memory) and RM (Read Only Memory).

RAM helps to both read and write Memory. The primary Memory collects the data which needs to be stored and needs very recent, which can be quickly accessed by the CPU. It is very volatile and loses the information when the power gets switched off. So it usually is static or dynamic.

ROM means a read-only memory. This Memory has instructions that help to boot up the system. It is a non-volatile memory. It means that it retains its content even after the power is switched off. 

There are three types of ROM, which are PROM, EPROM, and EEPROM.

∆Definition of Secondary Memory

Secondary Memory means an auxiliary memory of the computer. Here the data has to be permanently stored. Therefore, it should be kept in secondary Memory. 

In this case, the CPU cannot directly access the data in secondary memory. You need to copy the data initially to the primary Memory.CPU can process it quickly. Then you need to access the data from secondary Memory. But the time is a semiconductor.

It means the content of the secondary Memory will exist even after the power is switched off. The magnetic Memory or optical Memory makes the secondary Memory.

 It is available at cheaper rates if we are going to compare it to the primary Memory. This is because the secondary Memory collects and stores the data which the CPU wants to keep permanently.

You can get secondary Memory available in bulk, and it is more significant than primary Memory. A user can operate the computer efficiently, but it cannot work without secondary Memory because it is an external Memory. This Memory is non-volatile.

Examples of external or auxiliary Memory are hard disk, floppy disk, CD, DVD, etc.

Difference between primary Memory and secondary Memory

CPU or Processor can access the primary memory easily. CPU cannot access the secondary memory directly.
We know it as the main memory. We know secondary memory as the auxiliary memory.
This memory is volatile. This memory is non-volatile.
The primary memory stores the data or information which the CPU needs again and again. That memory is known as cache memory. The secondary memory collects and stores the data which the CPU wants to keep permanently.
Here, the semiconductors are used to make primary memory. Here, the magnetic and optical material is used to make secondary memory.
You can access any data from primary memory very fast. In this case, the speed of access is much lower.
It is small in size. It is large. 
The cost of primary memory is very high. The secondary memory has a low price.
It is the internal memory. It is external memory.
Here, the data bus controls the whole memory. In the case of secondary memory, it needs input-output channels.


Primary Memory is costly, and you can get it available in a limited size on a computer. While secondary Memory is much cheaper than primary memory, it is present in bulk on the computer. A computer can even work without secondary Memory, but it can’t work without primary Memory.

FAQS on the Difference between primary memory and secondary memory

Question – What is the distinction among RAM and ROM?

Answer – Primary memory refers to random access memory (RAM), while secondary memory refers to hard drives, solid-state drives, removable “USB” drives, CDs, and DVDs.

Question – What is primary memory?

Answer – Primary memory is the computer memory that the CPU accesses directly. This includes several types of memory, such as the CPU cache, the system ROM, etc. RAM, or random access memory, consists of memory modules that temporarily store data while the computer is running.

Question – What is secondary memory?

Answer – Secondary memory refers to data storage devices such as hard disks and solid-state drives. It can also include removable media such as USB sticks, CDs, and DVDs. For example, a computer has a 1 TB hard drive but only 16 GB of RAM.

Question – What are the different types of secondary memory?

Answer – There are three main types of secondary memory in computer systems: solid-state drives, such as USB drives; optical drives, such as CDs, DVDs, and Blu-ray discs; and magnetic drives, such as hard drives.

Question – Is the ROM a secondary memory?

Answer – ROM data continues to exist in memory even when the computer is turned off or turned off. In this sense, it is similar to secondary memory and is used for long-term storage

Leave a Comment