What is a Hard Disk and How Does It Work?

As we all know that computers or laptops are made up of many parts, without which they cannot work. One of those parts is the hard disk inside the computer. In this article, we will tell you what is Hard Disk, how it works, what are its uses and how many types are there? We are going to give it its full


Nothing will go wrong if Hard Disk is called the heart of the computer. In today’s post of What Is Hard Disk In Hindi, you are going to know everything about hard disk. It is also called HDD, HDD means Hard Disk Drive. In common language, we also call it simply Disk Drive.

What is a Hard Disk? Let us explain a simple example. Suppose you have a house and there is a special cupboard in your house where you keep all the things that make up your home safe.

Without that cupboard, your household items will not be safe and you will not be able to get them for use on the second day. This is how Hard Disk occurs.

Hard Disk is the part of the computer where all the files saved in the computer like Audios, Videos, Images, Documents, Softwares and Proggrams, etc. are safe.

After shutting down the computer, when we turn it on again, we get all these things again only because of Hard Disk. Hard Disk works to store and protect all these files simultaneously.

You must have understood that what does Hard Disk work for? How does it work

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What is Hard Disk – Complete information of hard disk

Hard Disk is an Electro Magnetic Data Storage Device that reads and stores digital information with the help of disks or platters. You must have seen a square flattened black box-like device in the computer, it is actually a hard disk.

Due to Hard Disk, we are able to retrieve all the data, apps and programs we have saved back. Meaning that even after shutting down the computer, they remain safe in it and we can use them again anytime.

A device that stores our digital data and keeps it safe to use is called Hard Disk. There are 2 types of Memory Device in our Computer. One is the Primary Memory Device and the other is Secondary Memory.

Primary Memory Device is our RAM i.e. Random Access Memory which is temporary memory. It works as long as Computer or Laptop On remains. It does not store anything but works to trigger that program.

This increases the speed of the computer and the computer does not hang again and again. Because it provides enough memory for the program to run properly, that is, it expands the memory.

The second is Secondary Memory Device which is Hard Disk. This data is protected for a long time, so it is called Permanent Memory or Non Volatile Storage Device.

You will remember that years ago we used Floppy Disk to store data as Secondary Memory Device. Just put Hard Disk in some similar way, these are also similar devices.

The difference is that Floppy was an external device that we used to take out of the computer after saving the data. In contrast, Hard Disk is an internal device that is connected to the motherboard with the help of cables inside the computer.

However, we can also take out Hard Disk comfortably. It uses Magnet to read and store data just like Floppy Disk.

Now let us tell you in a nutshell how hard disk works,

How do hard drives work?

Data is stored on hard drives in binary code, using 0s and 1s. The information extends over the disk’s magnetic layer and is read or written by the read heads that “float” above the surface due to the air layer created by the ultra-fast rotation of the disk.

So after knowing about what Hard Disk is and how it works, now we know its types. What is it like.

Types of Hard Disk – Types of Hard Disk

By the way, the history of Hard Disk is now quite old. The world’s first Hard Disk was created in 1956 by an IBM company. Hard Disk was invented by Reynold, B Jonson, who was an American working at IBM.

Since then, there have been many changes in Hard Disk. Speaking of recent times, Hard Disk can be divided mainly into four parts. These four types have their different abilities and qualities.


However, Hard Disk was discovered only in 1956. But it took a long time to develop. PATA ie Parallel Advanced Technology Attachment was the oldest hard disk. It connected to the computer with the help of ATA interface.

It was used extensively between 1985 and 1987. Its data transfer rate was very slow i.e. around 133 MB / s.

You just think that according to that time it was a good device which was at least better than Floppy.


This means Serial Advanced Technology Attachment. This is a little Advance from PATA Hard disks. Their data transfer rate and speed is much better than them. It uses thin thin Cables.

Their data transfer rate can be up to about 500 MB / s or even more. You just understand that SATA Hard Disks have been made with a lot of improvement in PATA Hard Disks, then obviously it will be better than them.


That is, understand what is the Small Computer System Interface Hard Disk and how it works. The data transfer rate speed of such hard disks is very high. It is much better than both the above types.

These hard disks use the Small Computer Interface to connect with the computer. Their data transfer rate is up to 700 MB / s, so obviously it is more fast and Advance.

4. SSD

Its full name is Solid State Drive, which comes in the most recent Disk Drive. They are produced by combining Flash Memory Chips and Flash Controllers. These HDDs are much faster than the old Hard Disk Drives.

You can get an idea of ​​their capability with their Data Access Speed. They are much smaller in size and less weight than the hard disks. This is also a very big benefit for them. But its high price works to give us a little disappointment.

Hope you understand easily what is Hard Disk and how many types are there. Now compare HDD and SSD to see which are better and why are better. How the two are ahead of each other or why they are behind.

What is the difference between SSD and HDD? (Solid State Drive vs Hard Disk Drives Comparison in Hindi)

As we have told you that HDDs are bigger in size than SSDs. Speaking of today’s time, hard disks with capacities up to 1TB come. Obviously, you can store a lot more data in them. Because 1 TB of storage is not less.

1 Tab means 1024 GB, which is very high capacity. Apart from this, you also get cheaper. SSDs seem a bit backward in this case because they are much more expensive than HDDs. By the way, in terms of size, they are quite relaxed.

They are very light and lightweight. Magnet is used for data storage process in HDD. HDDs are much weaker than SSDs in terms of speed. This is the reason that computers with Hard Disk Drive take a lot of time to start.

Unlike these, Integrated Circuits are used for data storing in SSDs. They are very fast and the speed of your computer becomes very fast. Different Capacity SSDs are available in the market nowadays. Using SSD makes your computer fast to a great extent.

So what is the difference between HDD and SSD? We have tried to provide you complete information about Hard Disk here broadly.

Here you know what is Hard Disk – What Is Hard Disk in Hindi and how Hard Disk works. Hope you have liked the information given by us.  

If you have any question, then you can ask by commenting in the comment box. Do like and share the post, thanks.


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