The hard drive (HDD) plays a very important role in the computer system. However, many people still do not understand what HDD is and what types of HDDs are, and how they work. Let’s learn about this type of hard drive right away in the article below of Ben Computer!

I. What is HDD?

What is HDD? HDD stands for the phrase Hard Disk Drive, ie a traditional hard drive. Its mechanism is a circular disk surface, to store data. This round disc has a magnetic coating, which scans data from the disc through the read-write unit on the plate when it rotates.

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What is hdd?

What is HDD, how does it work?

HDD is non-violate memory, so when there is no power connection, data will still be preserved. Currently, laptop HDDs have 2 common speeds, 5400RPM or 7200 RPM. There are a handful of HDDs that go up to 15,000 RPM.

II. Structure and working principle of HDD

1. Structure

What does hdd stand for?

Structure of HDD

The structure of an HDD hard drive includes: disk assembly, vertical head assembly, electrical circuit assembly, hard disk cover and magnetic disk.

  • Vertical head for reading and writing data.
  • The disc part includes the rotating shaft that creates the movement of the disc and the rotating motor.
  • The electrical circuit part includes: connector, power head, control circuit, data processing circuit, buffer memory and connection bridge.
  • The hard disk cover will include the base and the component cover.
  • The magnetic disk will be arranged to form a structure, which helps maintain data access.

2. Working principle

The principle of operation of the HDD is quite simple, thanks to the rotating mechanism of the magnetic disk and the vertical head. The magnetic disc will be made of aluminum, glass or ceramic, is magnetically coated and moves around a rotating motor.

Along with that is the combination with the control motherboard. From there can read and write data, decode information. This part will be the deciding factor on whether your operations on the computer are fast or slow.

3. Types of HDDs

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HDD is internal or external memory

There are HDD Internal and HDD External

The HDD will have an Internal HDD and an External HDD. Each type of HDD will have its own characteristics:

Most of these Internal HDDs have a capacity of 4TB, 3.5 inches in size. The data write speed of this hard drive is 530MB/s. The selling price of this type of hard drive ranges from 2 to 7 million VND.

The capacity of this type of HDD is usually 2 TB and is 2.5 inches in size. This hard drive provides power via USB and Thunderbolt ports.

III. Features of HDD

HDD has many advantages but still has some disadvantages.


– HDD has a large capacity, even up to more than 14TB. This level of capacity is 10 to 20 times that of a regular hard drive.

The price is quite affordable, so it will be suitable for popular computers.

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 Compare SSD and HDD

HDD has many advantages, so it is widely used


– Noise when operating, high heat.

– Vulnerable to shock damage to hard drive and data loss.

IV. Specifications on HDD

hard drive

Need to understand the specifications on HDD hard drive

There are many specifications on the HDD. You need to understand well to understand its principle and how it works. Here is an explanation of what the specifications on an HDD are.

  • Disk Capacity HDD: This is only the hard drive capacity.
  • Random Access Time HDD: This is a very important parameter, indicating random time to access, search for a random data.
  • Average Seek Time HDD: Only the average time to search the hard drive’s data.
  • Data access time HDD: This parameter indicates the data access time of the hard drive.
  • MTBF HDD (Mean Time Between Failures HDD): This parameter is simply understood as the life of the hard drive.

V. What is HDD speed measurement unit?

The most common HDD speed measurement units are 5400 RPM and 7200 RPM. The unit RPM stands for Revolutions per minute, which denotes the number of revolutions per minute. The higher the rotation speed, the faster the hard drive’s read and write times.

Nowadays, 7200 RPM HDD speed becomes common. The speed of 5400 RPM is not much, because it does not meet the requirements of fast processing speed of users.

Above, you have learned about hard drives What is HDD?. Along with that is information about the operating principle and technical parameters of this type of hard drive. If you have any questions about any problem, leave a comment below the article to be answered by Ben Computer!

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