What is the difference between a solid-state hard disk and a mechanical hard drive?

The biggest difference between solid-state drives is storage media.

It's kind of like the physics of Junior high school. The propagation of sound in different media is not the same, and the speed of propagation in solids is higher than that in gas.
Hard disk is also a reason AH, solid-state hard disk storage medium is flash chip, mechanical hard disk storage medium is magnetic disc. The reading speed is naturally different.
Moreover, the structure is different.
Traditional mechanical hard disk structure is complex, there are many mechanical parts, platters are also very fragile, by the impact of the outside is very easy to damage. And the mechanical parts also bring the inevitable power and noise.
SSD has successfully avoided the shortcomings of mechanical hard disk, no mechanical parts, 0 noise, long life, collision resistance, lower power consumption (solid-state hard drive does not require 12V power, the traditional 3.5-inch solid-state hard disk requires 12V power supply). And very fast (preferably the motherboard support SATA3 interface, otherwise it does not show the advantages of solid-state hard disk read and write speed).

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Solid-state hard disk and mechanical hard drive to distinguish between many, first of all, from the shape, the mechanical hard disk is larger than the solid state hard disk, so the weight is heavier than the solid state hard disk, followed by the price, solid-state hard disk price than mechanical hard disk much more expensive. In general, desktop computers are the basic mechanical hard drive, but with the development of solid-state drives, with the market and the various needs of users, solid-state hard disk has gradually become the focus of users to buy.

Solid-State hard disk applications than the use of mechanical hard disk more extensive, solid-state drives in the electronic world plays a very important part, very much attention by the industry, and mechanical hard disk use range is not as flexible as solid-state hard disk. With the largest volume of 1.6TB on a solid-state drive, it is rumored that IBM has begun testing 4TB of high-speed solid-state hard drives, compared to the size of a mechanical hard drive by TB capacity.

The internal parts of the mechanical hard disk are more complex than the solid-state hard disk, there are no motors and fans inside the solid-state hard disk, so in this aspect the solid-state drive will have a great advantage over the mechanical hard disk, while the solid-state hard disk is much quieter than the mechanical hard disk in the work. In addition to the power consumption, solid-state hard drives are also lower than the traditional mechanical hard disk.

In terms of the important reading and writing speed of the hard disk, solid-state hard disk read and write speed than mechanical hard disk read and write speed is high, generally twice times the speed of reading and writing ability, SLC only 100,000 times of reading and writing life, Low-cost MLC, read and write life only 10,000 times, compared to the traditional hard disk has no advantage. It is also important that solid-state hard disk is the use of flash chips inside the chip, while the mechanical hard disk is the data stored in the disk sector, when the use of the collision problem, the SSD can reduce the possibility of data loss to the minimum, compared to the mechanical hard drive will be much worse.

Solid-State drives in the data reading speed, seismic capacity, power consumption, running sound and heat, compared to the ordinary mechanical hard disk has a clear advantage, these are SSD solid-state hard drive the biggest selling point, below we specifically introduced.

1. Reading speed

Solid-state hard disk reading speed can be generally reached 400m/s, write speed can reach more than 130m/s, its read and write speed is ordinary mechanical hard disk 3-5 times;

2, anti-seismic ability

The traditional mechanical hard disk has high-speed operation of the head, its anti-seismic ability is very poor, so the general mechanical hard disk power if it is in motion or vibration, it is easy to damage the hard drive. But the mechanical hard disk uses the chip storage scheme, the internal does not have the head, has the ultra strong anti-seismic ability, even if is in the movement or the vibration use, also does not have the easy damage.

3. Power consumption

Solid-State hard disk power consumption is low, and has very low power standby function, and mechanical hard drive is not available;

4, noise

Solid-State hard drive can not hear any noise, while mechanical hard disk generally listen to the internal disk rotation and vibration of the sound, some use a longer mechanical hard disk noise more obvious.

5, Fever

Mechanical hard disk heating less, even after running for some time, its surface also feel no obvious fever, and mechanical hard drive after a period of time, touch can be clearly felt hot.

Any product has two sides, there are advantages will exist some do not go. Solid-State drives also have some deficiencies, such as capacity, Price is a major mishap. Below we through the solid state hard drive and the mechanical hard disk difference contrast, concrete understanding.

Difference between solid-state and mechanical hard drives
Project	Solid State Drive (SSD)	Mechanical hard Drive (HDD)
Capacity	Smaller	Big
Price	Your	Cheap
Random Access	Very fast	So so
Number of writes	Slc:10 million times/mlc:1 million times	Unlimited
Disk array	Can	Extremely difficult
Working noise	No	Yes
Operating temperature	Very low	More obvious
Shockproof Ability	Very good	Poor
Data recovery	Difficult	Easy

Through the above detailed solid state hard disk and mechanical hard drive contrast, we can see that the solid state hard disk in capacity, price, number of writes, data recovery, there are deficiencies, the following we specifically introduced.

1, capacity

At present solid-state hard disk capacity is generally between 64GB-512GB, more than 512GB of solid-state hard disk, despite the very few, but the price is very expensive. and the traditional mechanical hard drive, now basically is between 500GB-4TB, capacity is very large.

2. Price

Although the price of solid-state drives is gradually reduced, but the current price is significantly higher than the mechanical hard drive, the current 120GB of solid-state hard drives, the price is generally more than 400 yuan, 256GB solid-state drives in more than 700 yuan, and 500G, 1TB mechanical hard disk price is below 400 yuan, in terms of price, Mechanical hard drives are much cheaper.

3. Number of writes

Solid-State hard disk has write limit, that is, the life of the problem, SLC Master SSD has 100,000 writes, and the general introduction of solid-state hard drive MLC master, the number of written only 10,000 times, in theory, SSD life will be shorter, but the actual test can be found, SSD daily use MLC1 control SSD can also be used for about five years, so life is also possible.

Comparison of characteristics of MLC and TLC

While the mechanical hard drive although there is no limit on the number of writes, but the basic use is basically 35, so there is actually not much difference between the two.

4. Data recovery

Solid-state hard disk data after the deletion, can not rely on data recovery, such as software recovery, and the traditional mechanical hard drive through a number of professional data recovery software to retrieve, which is also a lack of solid-state hard disk.