SSD vs. HDD: What’s the Difference?

kiem tra o cung laptop la ssd hay hdd

What’s the difference between SSDs and HDDs? Solid state drives and hard disk drives are similar in their physical specifications, but they store data very differently. There are advantages and disadvantages to each type of drive, and deciding on which type is right for you comes down to how you use your computer. If you have to pick just one, though, how do you choose? Let’s get into the differences between SSDs and HDDs, and walk you through the advantages and disadvantages of each to help you decide.

What Is an HDD?

HDD also is known as fixed disk uses magnetic tape for the storage of data. HDD stores the data magnetically by using the rotating disks. HDD is a non-volatile storage medium meaning it can retain the data which is stored even when the system is switched off. HDD has moving mechanical parts. HDD consists of a mechanical component and an electrical component. The drives are made of aluminum with a magnetic layer covering. The rotation speed of the drives can vary as per the HDD model.However, HDDs have around 4200 to 15000 rotations per minute. The transmission of data, processing of the command is handled by the electronic component of HDD. The rotation of drives enables the reading and writing operations.

What Is an SSD?

SSD uses flash memory without using any moving parts to store the data in the system. So, in other words, it can be considered as a flash storage platform but a non-volatile one. SSD is a new-age technology. SSD does not have any moving parts or revolving disks. The absence of moving parts results in no noise or vibrations.SSD data will still be retained when the system is powered off. SSD utilizes a grid of electrical cells to transmit data. SSD enables data transmission at a quicker rate with speeds significantly more than a traditional drive. This increases the overall performance of the system.SSD is mini in size and hence occupies less space in a laptop. The most important aspect is the terrific speed, accompanied by quick loading and processing times which makes it an apt choice for entertainment or gaming lovers.SSD provides a dynamic boost to windows boot up and opening and running of any applications and files (even complex ones). Quick actions are at the forefront of SSD technology. SSD is very expensive (though the prices have come down in recent times).

Difference Between HDD and SDD

Hard Disk DriveSolid State Drive
HDD has longer Read and Write time.SSD has a shorter Read and Write time.
HDD has higher latency.SSD has a lower latency.
HDD supports fewer I/O operations per second (IOPS).SSD supports more I/O operations per second(IOPS).
Over a longer time, and with larger files stored on an HDD, there is a high chance of fragmentation.Fragmentation doesn’t occur on an SSD drive.
HDD is available in various different capacities.An SSD drive offers limited storage capacities.
HDD stands for Hard Disk Drive.SSD stands for Solid State Drive.
HDD offers a slower speed for reading and writing data.SSD is faster at reading and writing data.
An HDD weighs more.SDD drives are lighter than HDD drives as they don’t have the rotating disks spindle, and mirror.
The performance of HDD drives worsens because of the fragmentation.SSD drive performance is never impacted by fragmentation.
The moving parts of HDDs make them vulnerable to crashes and damage because of vibration.SSD drives can tolerate vibration up to 2000Hz, that is more than HDD.
HDD contains moving mechanical parts, like the arm.SSD does not contain mechanical parts, only electronic parts like ICs.
HDD drive is older and more traditional.SSD is a newer type of storage drive.
HDD can produce noise due to mechanical movements.SSD does not produce noise.
HDD are usually 3.5″ and 2.5″ size for desktop and laptops.SDD is available in 2.5 inch, 1.8″ and 1.0″, increasing the available space in a computer, especially desktop or server.
The HDD has moving part and magnetic platters. With more uses they are prone to fail.The SDD drive has no moving parts. With more uses they are less likely to fail.

Advantages of HDD

  • It provides a large storage capacity.
  • The stored items are not lost, even if the computer is shut down.
  • It is fixed inside the computer so it can’t be lost.
  • Computers can communicate with them easily.
  • It can store data like text documents, images, videos, etc.
  • HDD device can store operating system files and software related files.
  • It sizes very small, and it is portable in use.
  • They are cheaper compared to SSD.

Advantages of SSD

  • SSD drive offers access speed of 35 to 100 micro-second. So it is able to deliver 100 times the performance of HDDs
  • SSDs have lightweight components or moving parts, as they are more mobile-friendly and are much better suited for constant traveling.
  • SSD drives are resistant and highly durable
  • SDD uses flash memory to store data, which provides better reliability

Disadvantages of HDD

  • If hard disk crashes, the computer will not work.
  • You will lose your important data if the HDD drive crashes/ damages.
  • In the case of hard disk failure, it is difficult to perform the data recovery.
  • Regular “head” can crash, which damages the surface of the disk.
  • The hard disk is fixed inside the computer, so you can’t transfer to another computer.

Disadvantages of SSD

  • Upfront cost of for SDD is much higher than HDDs
  • SSDs have a limited number of times data can be written, erased, and rewritten to a portion of the drive.
  • The maximum capacity of an SSD is limited. Though, advancements in flash memory are consistently increasing the storage capacity of SSDs.

Leave a Reply