What is the difference between an SSD and an HDD?

Solid-state drives have too many advantages over mechanical hard disks, whether it is data read and write speed, or power consumption and other aspects, solid-state drives perform very well, but because of this, solid-state drives are much more expensive than mechanical hard disks. Hard disk has always been a very important component in the computer, many people when buying a computer, will first consider whether to buy a solid state drive, or buy a mechanical hard disk, let's analyze from their advantages and disadvantages to what kind of hard disk is more suitable to have. <>

1. Advantages and disadvantages of solid-state drivesAlthough solid-state drives are much more expensive than mechanical hard disks, they still can't resist the user's favor for solid-state drives. Because SSDs do not have a mechanical structure, SSDs are very fast when reading and writing data, and because there is less mechanical structure, SSDs do not produce too much noise, and at the same time, the power consumption required by SSDs is greatly optimized. However, because the technology is not mature enough, the number of reads and writes of SSDs is limited, and the frequency of SSD replacement is also high, which greatly increases the cost of use.

But the rich don't care. <>

2. Advantages and disadvantages of mechanical hard disksThe cost of mechanical hard disks is relatively cheap, but the service life is much longer than that of solid state drives. Because the mechanical hard disk uses a mechanical structure, the speed of reading and writing data is also relatively slow, and due to the high-speed operation of the mechanical structure, the mechanical hard disk will produce a lot of noise and vibration, and the power consumption is also relatively large. However, because of the impact of the ** and service life of mechanical hard disks, mechanical hard disks are still the mainstream in the market.

All in all, SSDs and HDDs have advantages and disadvantages, if the company's office staff, the speed of data dumping has requirements, then don't consider the price, or choose SSDs better, if you are an ordinary user, the security of HDDs, cost-effective, etc., then HDDs are definitely the first choice.

There are many ways to distinguish between SSDs and HDDs, first of all, in terms of appearance, HDDs are larger in volume than SSDs, so they are heavier than SSDs, and secondly, in terms of price, SSDs are much more expensive than HDDs.

The difference is that the speed of the solid-state drive is fast, and the daily read and write is dozens of times faster than that of the mechanical hard disk, but the cost is high, and it is not suitable for large-capacity storage. The mechanical hard disk is slow to read and write, but the cost is low, and it is suitable for large-capacity storage.

And the two work differently: SSDs are composed of a master cache and flash memory, and because there is no mechanical structure, there is no seek for reading and writing, so they are extremely fast and efficient.

In fact, there is no big difference in terms of storage, but if it is an SSD, it can increase the boot speed, it is recommended to use an SSD and a mechanical hard disk together to extend the life of the computer.

The information age is the era in which information generates value, and its representative symbol is"Computers"It is mainly based on information technology, focusing on the creation and development of knowledge, and behind the computer, there is an organic combination of a series of precision instruments and wisdom, of which the hard disk is the most important storage device of the computer.

In fact, there is a big difference in their appearance, and the function is also different, and the size is also different.

1. Don't buy miscellaneous SSDsAlthough most of the SSDs on the market are produced by big brands or manufacturers, there are still some miscellaneous SSDs flooding the market.

2. You can consider second-hand SSDsThe ** of SSDs is generally very high, so if we want to use SSDs, but the budget is insufficient, we can also consider second-hand SSDs, because SSDs generally have a very long service life, even second-hand SSDs still have the value of use and purchase.

3. It can be used with solid state drivesIf our budget is not very sufficient, we can also use solid-state drives, because the solid-state nature of solid-state drives leads to the storage of solid-state drives is very fast, so when we do the system, we generally do it in the solid-state drive, or if we want to play some large-scale games, it will also be stored in the solid-state drive, so the use of solid-state drives with mechanical hard disks is a good way to maximize value.

The differences between the two are as follows:

1. The essence is different: the essence of mechanical hard disk is electromagnetic storage, and the solid state is semiconductor storage.

2. Different shockproof and drop resistance: mechanical hard disks are very afraid of rate, and solid-state is shock-resistant.

3. The data storage speed is different: the read and write speed of the solid state is faster than that of the machine.

4. Different power consumption: The power consumption of SSDs is lower than that of HDDs.

5. Different weight: The weight of SSDs is lighter than that of HDDs.

6. The noise is different: mechanical hard disks have noise, and solid state drives have no noise.

The main differences are as follows:

1. In terms of appearance, the volume of mechanical hard disk is larger than that of solid state drive, so the weight is also heavier than that of solid state drive, and secondly, in terms of price, the price of solid state hard disk is much more expensive than that of mechanical hard disk.

2. The internal components of the mechanical hard disk are more complex than the solid state disk, and there are motors and fans that the solid state disk does not have, so the solid state disk has a great advantage over the mechanical hard disk in this regard, and the solid state disk is much quieter than the mechanical hard disk when working. In addition, in terms of power consumption, SSDs are also lower than traditional HDDs.

3. In terms of the important read and write speed of the hard disk, the read and write speed of the solid state disk is higher than that of the mechanical hard disk, which is generally about 2 times higher than the speed of the read and write ability, the SLC only has a read and write life of 100,000 times, and the low-cost MLC has a read and write life of only 10,000 times, which has no advantage over the traditional hard disk.

4. The solid state disk is a chip that uses flash memory particles, while the mechanical hard disk stores the data in the disk sector, and when there is a collision problem when it is used, the solid state disk can minimize the possibility of data loss, which is much worse than the mechanical hard disk.

1. Access speed.

SSDs have great advantages in transfer speeds, up to 500M seconds, of which the read speed can reach 400-600M per second, and the write speed can also be up to 200M per second. For 1G files, it only takes a few seconds to get it, while the traditional IDE hard disk read speed limit is not able to exceed 200M per second, and the write speed is difficult to break through 100M per second, usually basically in a few M per second, so for users who often need to read large files or process large files, using SSD is a good choice.

2. Data security.

We all know that the traditional hard disk is to read and write the data by reading the platter by the head, especially in the process of high-speed rotation The collision of the platter and the head is more likely to cause data damage, and it is easy to cause damage to the platter during transportation, resulting in data loss, while the solid state drive does not have a platter, so as long as the chip is not squeezed by the shape and deformed, the data can be safely preserved, so the difference between the solid state drive and the ordinary hard disk in terms of data security is very large.

3. Economy**.

Solid-state disk has great advantages in terms of speed and security, because it is the latest technology, so it is much higher than traditional hard disks, and the current solid-state drives are generally 2 or 3 times that of traditional hard disks, but with the continuous development of Moore's Law, the density of solid-state disk NAND flash memory chips will be larger and larger, the storage capacity will be higher and higher, and the future will be lower and lower, and it is foreseeable that solid-state drives will replace traditional hard disks.

1. Different performance:

The construction of SSDs and HDDs is completely different. SSDs boot up quickly and there are no motors to speed up the process of spinning. The biggest advantage of SSDs is that there is almost no seek time, and SSDs are just a common drive letter in the operating system, and users can use it completely as a storage medium.

Since it is all Flash storage media, it has no internal mechanical structure, so there is no data lookup time, delay time, and seek time. As we all know, the mechanical characteristics of ordinary hard disks severely limit the speed of data reading and writing, and the biggest bottleneck of computer running speed is precisely on the hard disk, so the birth of solid-state drives can just solve this bottleneck.

2. The reading and writing speed is different

Compared with HDDs, SSDs have the advantage of fast read speeds, and the boot speed is significantly improved after installation. Solid-state drives have a longer service life, and MLC and TLC are two more common types of flash memory particles, and MLC is more durable.

Based on the DRAM class:

DRAM-based SSDs: DRAM is used as a storage medium and has a narrow range of applications. It mimics the design of traditional hard disks, can be configured and managed by file system tools of most operating systems, and provides industry-standard PCI and FC interfaces for connecting to hosts or servers.

The application mode can be divided into two types: SSD hard disk and SSD hard disk array. It is a high-performance memory that can theoretically write infinitely, but the fly in the ointment is the need for an independent power supply to protect data security. DRAM SSDs are relatively non-mainstream devices.

Comparison of the difference between SSD and HDD:

SSD advantages: no noise, extremely fast read and write speed, vibration resistance, low heat generation, lightweight, etc.

Advantages of mechanical hard disk: large capacity, cheap.

Disadvantages of SSD: **High, small capacity, SSD has a limited number of PE writes, so the life span is lower than that of HDD.

Disadvantages of HDD: high noise, fear of vibration, high heat generation, slow read and write speed.

The difference between SSD and HDD is mainly in six aspects: shape, application, internal components, read and write speed, and security.

1. Appearance: The volume of mechanical hard disk is larger than that of solid state drive, so the weight is also heavier than that of solid state drive;

2. **: In terms of price, the price of SSDs is much more expensive than that of mechanical HDDs. In general, desktop computers are basically mechanical hard disks, but with the development of solid state drives, with the various needs of the market and users, solid state drives have gradually become the focus of user purchase;

3. Scope of application: The application range of solid-state drives is wider than that of mechanical hard disks, which play a very important role in the electronic world and are highly valued by the industry, while the scope of use of mechanical hard disks is not as flexible as solid-state drives. At present, the largest capacity volume of SSDs is a very large difference between the two when measured in terms of terabyte capacity compared to HDDs.

4. Internal components: The internal parts of the mechanical hard disk are more complex than the solid state disk, and there are motors and fans that the solid state disk does not have, so the solid state disk has a great advantage over the mechanical hard disk in this regard, and the solid state disk is much quieter than the mechanical hard disk when working. In addition, in terms of power consumption, SSDs are also lower than traditional HDDs.

5. Read/write speed: In terms of important read/write speed of hard disks, the read/write speed of solid-state drives is higher than that of mechanical hard disks, generally about 2 times higher than the speed of read/write ability, SLC only has a read/write life of 100,000 times, and the low-cost MLC has a read/write life of only 10,000 times, which has no advantage over traditional hard disks.

6. Security: Solid-state drives are chips that use flash memory particles inside, while mechanical hard disks store data in the disk sector, when the problem of collision occurs when used, solid-state drives can minimize the possibility of data loss, compared to this mechanical hard disk is much worse.

SSDs have significant advantages over ordinary HDDs in terms of data reading speed, shock resistance, power consumption, running sound and heat, which are also the biggest selling points of SSDs.

1. Reading speed.

The read speed of the solid-state disk can generally reach 400ms, and the write speed can also reach more than 130ms, and its read and write speed is 3-5 times that of ordinary mechanical hard disks;

2. Earthquake resistance.

Traditional HDDs have high-speed heads inside, and their shock resistance is very poor, so if the general HDD is used in motion or vibration, it is easy to damage the HDD. The mechanical hard disk adopts a chip storage solution, no magnetic head inside, and has super shock resistance, even if it is used in sports or vibration, it is not easy to be damaged.

3. Power consumption. SSDs have low power consumption and have very low-power standby capabilities, while HDDs do not;

4. Noise. SSDs are running hardly without any noise, while HDDs can generally hear the internal disk rotation and vibration sounds when you get closer, and some HDDs that have been used for a long time are more noisy.

5. Fever. The hard disk generates less heat, and even after running for a period of time, its surface does not feel obvious heating, while the mechanical hard disk can be clearly felt to be hot when touched by hand after running for a period of time.