HDD vs SSD, What difference and how to choose?
By Brielle Wilson 2018-05-24 70160 2
1. What is HDD and SSD?
The hard drive is a key component of laptop and desktop computers. The hard drive is technical products. The hard drive of a computer plays the essential role of storing and retrieving information. These types of hard disks can store a large number of files, music, videos and images because of their high storage capacity.
Hard disk drives (HDD)
HDD, know as hard disk drive are the most commonly parts for desktop computers. These disks internal or external to the computer, consist of one or more mechanical disks that read and write information on the disk. Inside the HDD there are sectors located on tracks, which are stored on rotating platters. These platters have magnetic heads which move with an actuator arm to read and write information.
Solid State Drive (SSD)
SSD, also know as solid state drive (and non-mechanical HDD) memory to store information. SSD made of integrated circuit assemblies by the control unit and storage unit (FLASH chip, DRAM chips). The SSD offer improved durability and superior performance to HDD drives. However, the HDD have generally higher storage capacity for SSD.
2. HDD vs SSD
SSD and HDD do the same job: they can start your operating system, store your applications and your personal files. But each has its own specific characteristics (storage capacity, price, speed, etc.).
(1) The price
SSD are more expensive than HDD in terms of Euro per gigabyte. An internal 2.5" 1TB HDD costs on average between 50 and 70 euros. On the other hand, it will take about 300 euros for an SSD of the same capacity.
(2) Storage capacity
Although there are several high capacity SSD (up to 16 TB), they remain scarce and costly. 500 GB to 1TB HDD is commonplace and is considered a basic capability. As for SSDs, the first prices offer a storage capacity of around 256 GB.
(3) Transfer speed
The transfer speed is the strong point of the SSD. A computer with a SSD will start in less than a minute (a few seconds for most) and be faster than HDD for starting and running applications as well as for transferring files. Whether you use computer for leisure, school and work, speed is still a criterion of choice for a computer.
(4) Durability and resistance
A SSD has no moving parts, so it is more resistant to impact when compared to HDD. Some external hard drives, however, have protection to address this problem (such as Rugged discs, water-resistant, dust-proof, shock-and-fall).
(5) Availability on the market
HDD are the most common and most accessible though SSD are starting to be increasingly present especially in small Netbook and Ultrabook laptops with storage capacities ranging from 256 to 516GB for the most part.
(6) Sizes and shapes
SSD are known for their performance. If you decide to option for a SSD for a hard drive and be aware that there are two common SSD sizes. The 3.5" is suitable for desktop computer while the 2.5" is designed to respond to laptop(with a more restricted space). Note that it is possible to connect a 2.5 "SSD on a 3.5" array via an adapter but the reverse is not possible. In the case of a laptop purchase, the default size of this SSD will therefore be 2.5". In this case, attention should be paid to the other technical specifications of SSD.
Noise is first thought: internal or external HDD drives are relatively noisy. Even the quietest HDD will emit a slight noise because of its playback arm and the rotation of its disc. Because of their flash memory, SSDs produce virtually no noise.
Next comes energy consumption: SSD should not consume electricity to run a platter. So SSD is less intensive than HDD. This lower energy consumption results in several minutes/hours of autonomy in addition.
SSD and HDD: main differences:
|Price||Much more expensive||Much more economical|
|Capacity||Betweem 256 GB and 1 TB||1 to 10 TB|
|Data transfer||between 200 and 550 MB/s||Between 50 and 150 MB/s|
|Durability||Can be rewritten a limited |
number of times
Mechanical parts that can be
damaged by moving
|Sizes and shapes||2.5", 3.5"||3.5"|
|Noise||Quieter because there are |
no moving parts
Something noisier because
having moving parts
|Starting time||7 Seconds||16 Seconds|
|Affected by magnetism||No||Magnetism can remove data|
It doesn't vibrate because it
doesn't have moving parts
The moving parts can cause
3. New tech to choose
Some manufacturers have implemented a solution for coupling a flash memory to a mechanical HDD. These "hybrid" models combine the storage capacity of a HDD and the performance of a SSD for a price slightly higher than a conventional hard drive. The flash memory serves as a buffer for frequently used files to speed up the launch of important applications.
Other technologies also exist to combine a HDD and SSD on the same computer, such as Intel's Smart Response technology (SRT). SRT uses the SSD as a cache to start the system or launch programs faster.
Although SSD is increasingly democratized, they are still costly but powerful alternatives to HDD.
HDD drives outweigh the issue of price, storage capacity and market availability.
As for SSD, they are definitely faster, more robust, more compact and less noisy. SSD drives are a choice option for laptops.
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