What’s the difference between SSD and HDD?

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In this blog we are telling about the What’s the difference between SSD and HDD? The SSD (Solid State Drive) can give you faster performance and more speed to your computer, but it is more expensive than the Hard Disk. HDD(Hard Disk Drive) is capable to store much more data than SDD, but you will find a lack of speed in your computer with a Hard Disk.

HDDs are storage devices with spinning platters that are used to read and write data. SSD are storage devices that are accessible in memory chips.

What is HDD?

What's the difference between SSD and HDD?

HDD is the hard disk data storage device that is used to store data. It has a metal platter with a magnetic coating to read and write data. the spinning motion of the head is used to access the data.

If the spinning rate is faster so HDD reads and writes data fastly. The size of the HDD is 2.5 inches for laptops and 3.5 inches for computers.

It uses a SATA interface. The full form of SATA is for serial advanced technology attachment and also know about What’s the difference between SSD and HDD?

What is SSD?

What's the difference between SSD and HDD?

SSD is connected to the flash memory chips which are used to store data. SSD is a solid storage device that has no moving parts inside it.

SSD is easily installed in place of the HDD because it has 2.5 inch SATA port. Upgraded SSD using NVMe(nonvolatile memory express) interface that can quickly read and write data.

Let’s take a look at the What’s the difference between SSD and HDD?

SpeedHDD has higher latency, longer read/write times. Lesser IOPs support (input-output operations per second). HDD is slower.SDD has a lower latency period, faster write/read time, and supports more IOPs (input output operations a second). SDD is much faster.
SectionsIt contains moving parts. A motor-driven spindle that carries one or more flat disc-shaped disks(known as platters) coated with a pencil-thin layer of magnetic material. Read & write front are positioned on the top of the disks- all covered in a metal case. It is a memory chip & does not contain any moving parts. It is an interrelated, Integrated circuit with an interface connector. Sections are basically- controller, cache & capacitor as well.
Dealing with vibrationsThe moving parts make them susceptible to crashes due to vibrations.It is capable of withstanding vibrations up to 2000Hz.
HeavinessIt is heavier than SSD.It is less heavy as it does not contain any parts like- rotating disks, motors & others as well.
Electricity, Noise & HeatIt uses more electricity than SSD. It does not use much electricity and without much usage of electricity much heavier so it does not produce any noise & heat.

Explanation with points-

  • Data transposition in an HDD & SDD
  • Speed
  • Components And Operations
  • Noise
  • Defragmentation in HDD
  • Capacity of storage
  • Price viewpoint
  • Reliability
  • Wear Out
  • Cost

Data Transposition In an HDD and SSD

In HDD data transposition is consecutive. The read-and-write head looks for the appropriate point in the hard drive to execute the operation. The transposition rate is influenced by the file system fragmentation and the layout of the files.

Data transposition is not consecutive in the SSD. It has random access so it works faster compared to the HDD. Read performance is consistent in the SSD because the physical location of data is not relevant. It has no read-and writes head so there are no delays in tasks due to the head motion also know about What’s the difference between SSD and HDD?

Read Also: How To save Google Drive Photos


Speed is one of the most important factors that differentiate HDD and SSD. Speed in the hard disk is calculated according to the RPM(revolutions per minute). The higher the rate of RPM shows the higher rate in HDD.

HDD spins at 5400 RPM or 7200 RPM for laptops and computers.

There are no platters in the SSD. The speed of SSD is measured in MB/s. It speeds up to 550 MB/s.

Spinning platters of HDD are used in the magnetic disks. It is also used in reading and writing head operations. So HDD speeds are slow in comparison to SSD because it needs a spin-up.

So the speed of SSD is faster than HDD.

Components and Operations

HDD consists of circular platters on which data is recorded. The platters are made from non-magnetic material that is coated with a thin layer of magnetic material. Read and write heads are on the top of the disks. Platters are run at very speed due to their motor.

HDD has two motors one spins at the top of the disk and another spins at the read-write head. Data is written on the read-write head of the platter and also know about What’s the difference between SSD and HDD?

SSD uses microchips and has no moving parts. SSD has a controller that executes on the firm-level software. The characteristics of an SSD are good performance, a cache where data is kept, an energy storage capacitor, and batteries.

Data is flushed to the drive when the power is gone. It has DRAM volatile memory and NAND flash memory. A single NAND chip is slow in use but when we configure multiple NAND chips the bandwidth increases.


Because of the spin of HDD disks, sounds are recognizable. The rotator moves in the platter it produces noise.

SSD drives have no moving parts with the integrated circuits so make no sound. the nature of the SSD drives is non-mechanical.

Defragmentation in the HDD

HDDs are used to store data in the form of magnetic platters, IO operations are faster when data is stored in the disk. Data is stored in the different parts of the disks because the disks need to spin for the different regions to come in contact with the areas and write a head motion also know about What’s the difference between SSD and HDD?

There is no consecutive space to store data in the file and this leads to the defragmentation in the SSD. Defragmentation slows down the performance of the disks.

There is no restriction to reading and writing data in the head motion in the SSD drives. Then the location does not give impact the performance. so defragmentation is not used in the SSD.

Capacity of storage

During recent periods the capacity of SSD lies between 120GB to 30.72TB- in new laptop-type devices. While most of the time the HDD lies between a maximum of 250GB to 20TB. And some companies like Apple- provide fusion drives that consist of 1HDD & 1SSD that work coherently jointly and also know about What’s the difference between SSD and HDD?

According to the 2022 data, Nimbus ExaDrive DC is the largest SSD, coming in at 100 TB for $40,000. Western Digital 18TB hard disk drives. Biggest hard disk drives you can buy right now and also know about What’s the difference between SSD and HDD?

Due to the cheaper price HDD is useful and it also provides suitable storage for use.

SSD are costly as compared to HDDs if you want to buy more than 1TB of storage. SSD is small in size. But SSD is used less due to their costly price.

Price viewpoint

According to the experts, the prices for SSD are higher as compared to HDD but the gap is closing as prices for SSD still falling and at one point in time it will definitely be equal to the price index of HDD also know about What’s the difference between SSD and HDD?

Why are prices for SSD falling continuously?

Density increase– 3D NAND technology act as a boost to this as it gives the power to for packing 32 to 64 times the capacity per die.

Process Efficiency The flash storage capacity has started working more efficiently and also know about What’s the difference between SSD and HDD?


The reliability of SSD disks is higher because it has no moving parts. Due to moving parts in HDD, it has a risk of mechanical failure. Does it also lead to the heads crashing due to the rapid motion of platters and heads in the HDD and also know about What’s the difference between SSD and HDD?

Crashes are caused by electronic failure, power failure, corrosion, wear and tear, physical shock, and bad manufactured parts. Another factor that decreases its reliability is the presence of magnets. HDD uses magnetic storage so they are affected by damage to the powerful magnets.

SSD does not lead to magnetic distortion.

Wear Out

When the flash stats gain momentum it leads to wear out because the SSD works with a limited number of cycles.

When the SSD got manufactured it put a lot of effort into the product architecture, controllers, and read, and write operations and also know about What’s the difference between SSD and HDD?


SSD is more expensive as compared to the HDD but the price of SSD is going down in recent years. HDD is around $0.04 per gigabyte and the price of SSD is around $0.50 per GB. If you buy a 1TB HDD it costs $55 on amazon and an SDD cost $475 also know about What’s the difference between SSD and HDD?

SSD uses new technology so it remains expensive as compared to HDD.


1. Why are SSD better than HDDs?

HDD are cheaper and provides more storage but SSD is faster ,durable and uses less energy.

2. How long will the SSD last?

SSD lasts up to five years.

3. What causes SSD to fails?

Due to its flash NAND memory because it has a limited number of read-write cycles. When the data is stored in the cell so it must be erased first throughout the cell.

4. What is the main difference between SSD and HDD?

The main difference between SSD and HDD is that SSD does not have the moving parts so it does not leads to distortion but HDD has a moving Platters which spins and sometimes leads to the mechanical failure.

5. Which drive is more safe SSD and HDD?

SSD is more safe because it prevents from accidental drops ,shocks and vibrations and provides better magnetic fields as compared to SSD.

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