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The difference between SSD and HDD on server.

SSDs are considered to be more efficient than HDDs in terms of durability, power consumption, faster access and more. Where as HDDs have upper hand over SSDs in terms of availability, storage space and pricing.
SSD- It stands for solid state drive, and does not have the mechanical arm just to read and write the data instead; it relies upon the controller to perform the operations such as reading and writing.

HDD- It stands for hard disk drive an is capable of storing the data at cheapest price.It also uses the magnetism to store the data using platter.
SSD - solid state drives - are persistent RAM-based storage devices that emulate hard disk drives. Today, they have low read latency, low random access latency, medium write latency, and medium throughput based on the application. They tend to be more power efficient than HDD. They have no moving parts.

HDD - or hard disk drives - are the “traditional” open system mass storage unit, made from multiple oxidized platters that spin like records on a record player, with a manifold actuator arm with read/write heads that (logically) read and write data off the platters.

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A hard drive is the place where all a server’s data is stored. This includes the operating system, your website software and all your website data and content. Any software updates or website changes are written to that drive and when someone visits your site, the information on the drive needs to be read and processed.

On traditional HDD drives, that information is stored on thin, metal disks that spin at around 7,200 RPM. Using similar technology to a CD or DVD, information is written to it or read from it using a read/write head that hovers close to the disk’s surface.

The Achilles heel of the HDD drive is that it is built using moving parts. At 7200 RPM, a disk will spin almost 3.8 billion times in a year. Over time, this will eventually lead to wear and tear and, at some point, its mechanical parts will start to fail. Its other problem is that the speed at which data can be written and read is limited by how fast it can spin. Again, this is a limitation caused by it using mechanical technology that, in many respects, we first saw with the gramophone.

An SSD (solid state drive) works in a completely different way. It has dispensed with moving parts completely and, instead, stores data on interconnected flash memory chips. It can do everything that an HDD drive can do, however, as it is not reliant on how fast a disk can spin, it performs much quicker and without the risk of mechanical failure.

It is the speed and reliability of SSDs that make them more advantageous for hosting. In the next section we’ll explain the benefits these bring to website owners.
SSD (Solid State Drive)​
HDD (Hard Disk Drive)​
Power Draw / Battery Life

Less power draw, averages 2 – 3 watts, resulting in 30+ minute battery boostMore power draw, averages 6 – 7 watts and therefore uses more battery
CostExpensive, roughly $0.20 per gigabyte (based on buying a 1TB drive)Only around $0.03 per gigabyte, very cheap (buying a 4TB model)
CapacityTypically not larger than 1TB for notebook size drives; 4TB max for desktopsTypically around 500GB and 2TB maximum for notebook size drives; 10TB max for desktops
Operating System Boot TimeAround 10-13 seconds average boot up timeAround 30-40 seconds average bootup time
NoiseThere are no moving parts and as such no soundAudible clicks and spinning can be heard
VibrationNo vibration as there are no moving partsThe spinning of the platters can sometimes result in vibration
Heat ProducedLower power draw and no moving parts so little heat is producedHDD doesn’t produce much heat, but it will have a measurable amount more heat than an SSD due to moving parts and higher power draw
Failure RateMean time between failure rate of 2.0 million hoursMean time between failure rate of 1.5 million hours
HDD(Hard DiskDrive) SDD(Solid State Drive)
  1. Can Store huge amount of data (Cheaper) Less amount of Storage(Costlier)
  2. Made up of magnetic disk Made up of Semiconductor components
  3. Slower to perform Blazing Fast Servers
  4. Query operations are slower Query operations are faster
  5. More energy required and heats the drive Less energy required and no Heating issues
HDD(Hard Disk Drive): are widely used for storage purposes and can perform read/write operations on it,they are made up of Magnetic Tapes,the data is being stored as and when the disk spins and the overall process is slower.

HDD's are being replaced with SSD's(Solid State Drive) as these are immovable disks and perform read/write operations at a faster rate and are Light and compact compared to HDD's.

When it comes to Hosting,Using an SSD plays a vital role,as it helps to Load the Website faster.
SSDs are better than HDDs when it comes to speed of read and write. But, they're expensive too.
On the other hand, HDDs provide more storage facility in less cost.
One can use SSDs for booting into the OS.
And HDDs for storing files.
SSDs are faster than HDDs and take up less space. While HDDs are cheaper compared to SSDs.
HDDs have moving parts, but SSDs don't have moving parts.
A hard disk drive (HDD) is an old-school storage device that uses mechanical platters and a moving read/write head to access data. While a solid-state drive (SSD) is a newer, faster type of device that stores data on instantly-accessible memory chips.
About SSD.
  • They are quiet.
  • Not mechanical.
  • Fastest.
  • More expensive.
  • When the life cycle for one cell of a SSD is used, what happens then? Is the disk reduced by only this cell and works normally?
  • What is the best filesystem to write? Is ext4 good because it saves to cells consecutively?
About HDD.

  • Cheaper.
  • In case of mechanical fault, I believe there is usually no way to repair it.
  • Slowest, although I think HDD speed is usually sufficient for servers.
I switched to SSD and now I am using NVMe which is bit faster than SSD.

It takes only few seconds in booting any OS.
SSD and HDD involve price, performance and durability, all based on the underlying technology of these two storage mediums.

Let's recap the HDD vs SDD difference:


• Use magnetic platters and moving parts to store data.
• Are the legacy data storage standard for PCs, servers and enterprise storage arrays.
• Have lower price tags than SSDs on a per-GB basis.
• Are slower than SSDs.
• Use more electricity than SSDs and require more cooling.


• Use semiconductor chips to store data and have no moving parts.
• Are gaining popularity but remain a pricey storage alternative for PCs, servers and storage systems.
• Have higher price tags than HDDs on a per-GB basis.
• Are much faster than HDDs
• Use less electricity than HDDs and run cooler.
When comparing SSD dedicated hosting to a hosting solution that uses HDDs, speed often serves as a determining factor.
Because SSDs serve data significantly faster than HDDs, SSD hosting offers you a website that will load much quicker.