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Sunday 2nd of October 2022

What is SSD? How SSD Works? Why is SSD better than HDD?


Solid-State Drives (SSDs) are a new generation of computer storage devices. SSDs use flash memory, which is much faster than a mechanical hard drive.

What is a Solid – State Drive?

Data was mostly stored on mechanical hard drives for decades. Traditional hard disk drives (HDDs) rely on moving elements to collect data, such as a read/write head that moves back and forth. As a result, hard disk drives are the most likely computer hardware component to fail. A solid-state drive (SSD) is a storage device that allows reading, writing, and storing data permanently without a constant power source.

The new solid-state drives operate in a very different manner. They make use of a NAND flash memory chip, which has no moving parts and provides near-instant access.

An SSD’s memory chips are similar to those found in random access memory (RAM). Files are saved on a grid of NAND flash cells rather than a magnetic platter. Each grid (also called blocks) can store between 256 KB and 4MB. The controller of an SSD has the exact address of the blocks, so that when your PC requests a file it is (almost) instantly available. There’s no waiting for a read/write head to find the information it needs. SSD access times are thus measured in nanoseconds.

How SSD Works?

An SSD storage device, unlike a hard disk drive, has no moving parts and provides near-instant access. The data is saved in microchips on SSD, which makes it faster. In comparison to HDDs, SSDs are smaller and can be directly installed to the motherboard. It’s a more complex and sophisticated version of a USB memory stick, if you will.

SSDs rely on flash-based memory, with the two most common flash kinds being NOR and NAND. NAND flash memory is used in most SSDs because it is faster for writes and less in size than NOR flash memory. NAND is a type of non-volatile memory that retains data even when the disk is turned off.

While HDDs utilize a mechanical arm to read and write data, SSDs read and write data using a CPU (controller). It is also in charge of data storage, restoration, caching, and cleanup.

The controller determines the SSD’s reading and writing speeds, as well as its overall performance.

Why is SSD better than HDD?

  • Speed : The most noticeable and major advantage of an SSD over an HDD is speed.
  • Energy Efficiency : An HDD is an energy storage device due to its reliance on several mechanical activities. SSDs, on the other hand, are more energy efficient and use less power, extending battery life.
  • No overheating : SSDs are more heat-resistant than HDDs, which can cause the system’s overall performance to drop.
  • Build : It’s a more dependable storage device that doesn’t shake and can withstand shocks, unlike an HDD. HDDs are noisy, whereas SSDs are quiet.
  • Weight : In comparison to HDDs, SSDs are lighter, making them more efficient in terms of performance and functionality.

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