ByJeth Shedd 2020-01-20 4232
SSD generally refers to the use of flash memory chips composed of SSD solid state hard drive, is the use of FLASH flash memory particles as a storage unit, no longer use the traditional mechanical storage methods, use simulation to simulate the traditional hard disk access methods and sectors, etc., you can also simply understand that solid state disk is a "large USB disk" with hard disk interface (SATA/ATA, etc.), what is different is that there is no mechanical structure. Using the traditional NAND Flash characteristics, block writing and erasure are used to read and write, so the efficiency of reading and writing depends very much on the development of flash memory technology. Compared with the traditional mechanical hard disk, it has the advantages of low power consumption, shock resistance, high stability, low temperature resistance and so on.
Flash-based solid state hard disk (IDE FLASH DISK and Serial ATA Flash Disk): use FLASH chip as storage medium, and their appearance can be made into a variety of shapes, such as notebook hard disk, micro-hard disk, memory card, flash drive and so on. The biggest advantage of this kind of SSD solid state disk is that it can be moved, and the data protection is not controlled by power supply, so it can adapt to various environments, but its service life is not high, so it is suitable for individual users.
Solid state hard disk based on DRAM: DRAM is used as storage medium, and its application range is narrow at present. Following the design of traditional hard drives, volumes can be set and managed by file system tools of most operating systems, and industry-standard PCI and FC interfaces are provided to connect hosts or servers. The application methods can be divided into two types: SSD hard disk and SSD hard disk array. It is a kind of high-performance memory, and its service life is very long. the only drawback is that an independent power supply is needed to protect data security.
1, fast writing speed
DRAM-based solid state disk write speed is very fast
Because there is no mechanical motor and fan, the noise value is 0 decibels. Some high-end or high-capacity products are equipped with fans, so they still produce noise.
3, start-up fast
There is no motor to accelerate the rotation process.
4, small read delay
No magnetic head, fast random reading, minimal read delay. According to related tests: on two computers with the same configuration, laptops with solid-state drives took only 18 seconds to appear on the desktop, while laptops with traditional hard drives took a total of 31 seconds, nearly half the difference between the two.
5, the fragment does not affect the reading time
Relatively fixed read time. Because the addressing time is independent of the data storage location, disk fragmentation does not affect the read time.
6, small size, lightweight
Low-capacity solid-state hard drives are smaller and lighter than mechanical hard drives of the same capacity. However, this advantage gradually decreases with the increase of capacity. Up to 256 GB, solid state drives are still lighter than ordinary mechanical hard drives of the same capacity.
7, low calorific value
Solid-state hard drives have low power consumption and are more power-efficient than mechanical hard drives. Low-capacity flash-based solid state drives have lower energy consumption and heat generation in the working state, but high-end or high-capacity products will consume more energy.
8, larger operating temperature range
A typical hard drive can only work in the range of 5 to 55 degrees Celsius. While most solid state drives can work at-10 ℃ to 70 ℃, some industrial-grade solid state drives can also work at-40 ℃ to 85 ℃, or even a larger temperature range (e.g: RunCore military grade products temperature is-55 ℃ 135 ℃).
9, durable, shockproof and fall-proof.
Due to the full use of flash memory chips, SSD solid-state drives will not affect normal use even when moving at high speed or even when flipped and tilted, and can minimize the possibility of data loss in the event of accidental drop or collision with hard objects on laptops. Compared with traditional hard drives, solid state drives are much more earthquake resistant, making data more secure.
10, there will be no mechanical failure
There are no mechanical moving parts inside, there will be no mechanical failure, and there is no fear of collision, shock and vibration. In this way, normal use will not be affected even in the case of high-speed movement or even accompanied by flip tilt, and the possibility of data loss can be minimized when the laptop accidentally falls or collides with hard objects.
1, solid-state disk life is limited
Although the solid-state hard disk does not have the mechanical structure of the traditional hard disk, there are no problems such as head aging, bad disk and so on, but due to the use of flash memory as the storage medium, its limited erase and write times is a major injury. Take the flash memory chip of 32nm process as an example, the theoretical erase and write life of flash memory particles commonly used in solid-state hard disk is about 5000 Mel 10000 times. Solid-state drives are still "fragile" compared to mechanical hard drives: traditional hard drives record data on the magnetic layer and can theoretically withstand countless read and write operations without the risk of magnetic failure, which flash memory obviously cannot do.
2, data loss is irrecoverable
If the mechanical hard drive is broken and can still do data recovery, the solid-state hard drive can not even eat this "regret medicine", because the solid-state hard drive works differently from the mechanical hard drive. The traditional hard disk records the data on the magnetic layer, in theory, it can withstand countless read and write operations without the risk of magnetic failure, so even if the hard disk has been damaged, it can still be recovered by professional tools to read the cylinder information of the magnetic layer. But the solid state disk is different, there is no internal mechanical structure, the data is scattered in each flash memory, it is almost impossible to recover the data from the damaged flash memory chip. Because the storage principles of the two are different, the solid-state disk deletes files not just the index of the file as a mechanical hard disk, but all of it.
3, high speed, unstable
Once the solid-state drive was launched, it directly subverted consumers' traditional concept of hard drive: not afraid of shock, turn on the SSD to play on the swing (of course, your data line should be strong enough); fast, it only takes a few minutes to copy an action blockbuster; boot hard, "your boot speed beats 99% of the country's computers." But "fast" is not necessarily a good thing, it is sad to encounter a blue screen. Don't just look at the superficial reading and writing speed, who is in a daze watching the file replication speed all day? Solid state disk as a storage medium, the primary requirement is stability. No matter how fast the SSD, is bought home, it can only face a computer that may have a blue screen at any time every day. What's the use of
4, solid state disk is getting slower and slower?
SSDs will be used more and more slowly, which has a lot to do with how SSDs work. Solid state drives use flash memory as a storage medium, and flash memory has a feature: it must be erased before it can be written again, unlike mechanical hard drives, which can be overwritten directly on top of the data. Over time, there is less and less unused storage space in SSD, and in many cases the data in flash memory must be erased before writing, so its performance will degrade significantly.
5, chip quality is uneven
Flash memory chips are cut from the wafer before packaging, the product yield is not necessarily ideal, some are insufficient capacity, some life can not meet the requirements, some tests can not pass, these products that can not meet the factory requirements flow into the market through various channels, commonly known as "black film" and "white film". Since SSD uses flash memory chips as storage media, the quality of such chips is also uneven. The same SSD product, depending on the capacity, there will be 416 flash memory chips. The disadvantages are obvious: a hard disk crash will cause the loss of all data irreversibility. Although the damage to a solid-state drive chip will not be completely destroyed, I am sorry if important data is stored in this location.
6, small capacity
Solid state disk has been developed for several years, but the current SSD capacity is still not large enough, mainstream users still choose 120GB or 240GB or so products, the larger capacity, the price generally needs to double. At present, the basic standard configuration of mechanical hard disk is 1TB, which is several times the capacity of SSD.
1, speed, solid state disk transmission speed can reach 500MB amp s, in which the read speed reaches 400-600MB per second, the write speed reaches 200MB per second. On the other hand, the traditional hard disk read speed limit can not exceed 200MB per second, and the write speed is about 100MB per second. If you encounter discontinuous scattered data, SSD can show extremely fast reading and writing speed. However, the transmission speed of traditional mechanical hard disk is slow because of head seek and other reasons.
2, safe, solid state hard drives do not have disks, so as long as the chips are not deformed by shape extrusion, the data can be safely saved. However, the traditional hard disk does not have this advantage, once the disk collides with the head in the process of high-speed rotation, or even unreasonable contact, it will cause disk damage and data loss.
3, economy, under the same capacity, the price of solid-state disk is 5 times higher than that of traditional hard disk at this stage, but with the advance of Moore's law, the density of solid-state disk NAND flash memory chip will become larger and larger, and the storage capacity will become higher and higher, which will one day replace the traditional secondary storage device.
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