Difference Between SSD and HDD

By BYJU'S Exam Prep

Updated on: September 25th, 2023

Difference Between SSD and HDD: The two primary storage alternatives to consider are solid-state drives (SSDs) and hard disc drives (HDDs). Comparing capacity and pricing isn’t the only factor to consider when selecting storage. The difference between SSD and HDD is based on the type of storage your computer utilizes having an impact on its performance, as well as its power consumption and dependability.

Physically, solid-state drives and hard disc drives are similar, yet the main difference between SSD and HDD depends on how they store data in completely different ways. Each type of drive has pros and cons and selecting which is best for you depends on how you use your computer. Here, we will discuss SSD, HDD, and the difference between SSC and HDD in the upcoming sections.

What is the Difference Between SSD and HDD?

SSD stands for Solid State Drive and HDD refers to Hard Disk Drive. I/O operations per second (IOPS) are limited on HDDs, but SSDs support higher I/O operations per second (IOPS). Here, we have provided the difference between SSD and HDD listed in the table below.

Key Difference Between SSD and HDD



SSD is a Solid State Drive.

HDD is a Hard Disk Drive.

SSD is faster at reading and writing data. 

HDD has a slower speed for reading and writing data.

SSD does not produce much noise.

HDD can produce noise due to mechanical movements.

The latency of SSD is lower. 

HDD has higher latency.

I/O operations per second are faster with SSDs. 

I/O operations per second are limited on HDDs.

SSD is available with limited storage capacity.

HDD is available in various storage capacities.

SSD is compact in size.

HDD is larger in size.

No moving parts are involved in SSD.

HDD has moving parts and magnetic platters.

What is an SSD?

Solid-state drives (SSDs) got their name from the solid-state electronics they employ within. All data is saved in integrated circuits in an SSD. This distinction from HDDs has a number of implications, particularly in terms of size and performance. Without the requirement for a spinning disc, SSDs can be as compact as a stick of gum or even a postage stamp. Their storage capacity (the amount of data they can hold) is variable. SSD is more expensive per gigabyte (GB) and a terabyte (TB) of storage than HDD.

A solid-state drive (SSD) is a non-volatile storage device that saves and retrieves data on solid-state flash memory on a continuous basis. However, instead of platters, this data is stored on interconnected flash memory chips, making them faster than HDDs. When compared to HDD, it performs better.

Advantages of SSD

The advantages of SSD are mentioned below.

  • SSD drives are robust and long-lasting.
  • SDDs store data in flash memory, which ensures greater reliability.
  • Because SSDs are more mobile-friendly and better suited for constant travel, they contain lightweight components or moving elements.

What is an HDD?

The full form of HDD is Hard Disk Drive. An HDD makes advantage of magnetism to store data on a revolving platter. For reading and writing data, it has a read/write head that floats above the rotating platter. An HDD can perform faster if the platters spin faster. An I/O controller and firmware are also included in the HDD, which instructs the hardware and communicates with the rest of the system. 

A hard disc drive (HDD) is a computer’s internal data storage device. It contains rotating discs that store data magnetically. HDDs are referred to be legacy technology because they have been around longer than SSDs. They are generally less expensive and suitable for data that is not frequently accessed, such as backups of images, videos, or business files. They come in two sizes: 2.5 inches (often used in laptops) and 3.5 inches (usually used in desktop PCs) (desktop computers). 

Advantages of HDD

The advantages of HDD are mentioned below.

  • A hard disc drive (HDD) may store operating system and software files. It has a great capacity for storing.
  • Even if the computer is turned off, the stored items are not lost.
  • It can’t be lost because it’s fixed on the computer.
  • Computers can easily converse with them.
  • It can store data such as written documents, photos, and videos, among other things.
  • It is quite tiny and portable when in use.
  • They are less expensive than SSDs.

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