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What is 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? Give full of it.

If Hard Disk is called the heart of the computer, nothing will go wrong. In today’s post 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 just Disk Drive.

What is Hard Disk? Let us explain you with a simple example. Suppose you have a house and you have a special cupboard in your house where you keep all the things that run your house safely.

Without that cupboard, your household items will not be safe and you will not be able to get them to use the next day. In the same way hard disk is.

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

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

You must have understood that what is the use of Hard Disk? Meaning how does it work?

What is Hard Disk – Complete information about 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 device that looks like a square flattened black box in the computer, it is actually a hard disk.

Due to Hard Disk, we are able to retrieve back all the data, apps and programs saved by us. Meaning even after turning off 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 devices in our computer. One is 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 the computer or laptop is on. It does not store anything, but works to speed up 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 well, that is, expands the memory.

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

You will remember that years ago we used to use Floppy Disk to store data as Secondary Memory Device. Just put the hard disk in the same way, these are also exactly the same device.

The difference is that Floppy was an external device that we used to take out from 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.

Although we can also take out the hard disk comfortably. It uses Magnet like Floppy Disk to read and store data.

Now let us tell you in brief how the hard disk works.

How do hard drives work?

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

So after knowing about what is Hard Disk and how it works, now know its types. How many types are there?

Types of Hard Disk – Types Of Hard Disk

By the way, the history of Hard Disk has become very old now. The world’s first hard disk was made in 1956 by the IBM company. Hard Disk was invented by Reynold, B Jonson who was an American who worked at IBM.

Since then, a lot of changes have come in the hard disk. Talking about the recent times, Hard Disk can be mainly divided into four parts i.e. types. These four types have their own different abilities and qualities.


Although Hard Disk was discovered only in 1956. But it took a long time to develop. PATA i.e. Parallel Advanced Technology Attachment was the oldest hard disk. It used to connect to the computer with the help of ATA interface.

It was widely used between 1985 and 1987. Its data transfer rate used to be very slow i.e. about 133 MB / s.

You can just assume that it was a decent tool for that time, which was at least better than Floppy.


It means Serial Advanced Technology Attachment. This is a little advance from PATA Hard Disks. Their Data Transfer Rate and Speed ​​are much better than them. Thin thin cables are used in this.

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


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

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

4. SSD

Its full name is Solid State Drive, which comes in the latest Disk Drive. They are made up of a combination of Flash Memory Chips and Flash Controllers. These are much faster than HDD i.e. old hard disk drives.

You can guess their capacity from their data access speed. They are very small in size and very less weight than hard disks. This is also a great advantage of them. But its high price works to make us a little disappointed.

Hopefully, what is Hard Disk and how many types are there, you must have understood easily. Now just compare HDD and SSD, let’s see which one is better and why. How are both ahead of each other or why are they behind.

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

As we have told you that HDD is bigger in size than SSD. Talking about today’s time, there are hard disks with capacity up to 1TB. Obviously, you can store a lot of data in them. Because the storage of 1 TB is not less.

1 Tab means 1024 GB, which has a lot of capacity. Apart from this, you also get cheap ones. SSDs tend to lag behind in this respect as they are much more expensive than HDDs. By the way, in terms of size, they give a lot of comfort.

They are very light and lightweight. Magnet is used for data storage process in HDD. HDD are much weaker than SSD in terms of speed. This is the reason why computers with hard disk drives take a lot of time to start up.

Unlike these, Integrated Circuits are used for data storage in SSD. They are very fast and the speed of your computer becomes very fast. Nowadays SSDs of different capacities are available in the market. By using SSD, your computer becomes very fast.

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

Devendra Singh

Hello, I am Devendra, Founder and Author of Computermash. Here you will get all information and tutorials related to computer, education, blogging.

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