Working principle of hard drive. I thought it was complicated, but it’s not complicated at all

If the CPU is considered the central controller, where all commands are given to process information, the hard drive is considered as the data storage place of that central processor. Here, let’s GhienCongListen discover Working principle of hard drive How to better understand how your computer works. Let’s start.

Let’s learn about the working principle of hard drive

What is the working principle of HDD hard drive?

Reading and writing data on the hard drive is not too complicated, you can observe the illustration below.

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Reading and writing operations on the hard drive

The process of reading and writing data of the hard drive is based on two movements. It is the rotation of the magnetic disk and the movement of the poison. These two actions take place at the same time when performing a read or write process.

When the magnetic disk rotates, the rotating shaft is responsible for keeping it fixed and acting to make the magnetic disk rotate at a certain speed. When the magnetic disc has rotated evenly, the moving rod will move to and contact the surface of the magnetic disk. Start the process of reading or writing data.

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In the read / write head there is an electric field sensor that helps it read data at any position on the surface of the disk. Simultaneous data is read and written on every active disk.

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What is the working principle of SSD hard drive?

Unlike HDD, which must write all information on magnetic disks, SSDs always write information to memory plates stored on the circuit board and this is where data is stored on your computer. These memory plates are divided into pages, and the pages are stacked on top of each other and called blocks.

• Locate a block with enough “unused” pages.
• Make a list of the pages in that block that you still need.
• Empty all pages in that block.
• Rewrite the required pages with the new block.
• Fill in the blanks with new information on the remaining pages.

In other words, once you have used up all the free pages on your new SSD, it will have to go through this phase any time it wants to write new data. This is how flash memory works. However, it’s still faster than a standard HDD, and the speeds achieved with an SSD are definitely worth buying over an HDD.

How hard drives interact with the computer

You should remember that all reading and writing operations on the computer are controlled by the CPU. When the CPU or rather the user has a request to extract data, the hard drive will perform the reading or writing.

The next thing you should know is that computers interact with data regularly, so reading and writing data is continuous and extremely random. Therefore it can read and write anywhere on the disk surface.

When interacting with the computer, if the CPU requests to extract, those requests will be temporarily cached, from where the hard disk can simultaneously extract many different tasks at the same time, making it faster. The processing of the entire system is pushed up faster.

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Reference Wikipedia