Disco duro ssd Science Lecture Hall – Solid-State Drive (SSD) Literacy

Disco duro ssd Science Lecture Hall – Solid-State Drive (SSD) Literacy

disco SSD SSD OEMdisco Duro SSD solid-state drive disco Duro SSD (SSD for short) is a new thing. The whole machine manufacturer also buys its accessories to assemble computer disco Duro SSD, which basically takes the SSD as the first choice, and the mechanical hard disk drive (HDD for short) is usually treated as a warehouse disk.

For the convenience of understanding, I use the form of a table to simply distinguish the similarities and differences between the two hard disks (taking the 2.5-inch product as an example), and follow the main needle SSD to explain.

The above figure is clear, excluding the price factor, the SSD shows a comprehensive crushing trend. This is mainly caused by the way the two are stored in the same way.

After the interlude, I got to the point. Most of the PC hardware said that the industry recognized the classification standard from the one. Only by understanding SSDs from the same latitude can this part have a deeper understanding.

According to this latitude, the common SSDs must be divided into three categories: SATA interface, M.2 interface, and PCI-E interface.

The conclusion obtained below is based on the control variable (interface type) of the control variable, which is the same by default.


SATA interface 2.5-inch SSD and the current market on the market of mechanical hard disk interface is different, are a power supply interface a SATA3.0 data interface. This type of SSD is also the early form of SSD.

M.2 interface SSD series In recent years, various computer manufacturers like to use a class of products, when used directly into the motherboard interface and screw fixed. Regardless of the size of the system, the ease of installation is better than that of traditional 2.5-inch SSDs.

There is a point to pay attention to the series, M.2 interface supports both SATA and PCI-E two channels, if you occupy the motherboard SATA bus, the performance of the motherboard and the traditional SSD is not significantly different, and the occupation of the motherboard PCI-E bus M.2 interface SSD is a better performing product. Classmates need to be screened when they buy it.

PCI-E interface SSD is the current desktop SSD top product, the theoretical transmission speed is 3-6 times higher than the SATA interface SSD, the performance is more excellent, and the capacity is greater, so the price is more expensive.

With the official launch of intel’s own QLC solid-state drive products 660P and 760P some time ago, the type of SSD storage particles has once again caused extensive discussion. I remember that the last large-scale discussion was more than 6 years ago when Samsung launched the world’s first TLC SSD 840.

Before talking about this part of the content, I also control the variables first, and the following examples are stipulated that each SSD has the same number of storage units (cells).

SLC (Single-Level Cell) is the early birth of the SSD, each storage unit only stores 1-bit potential, that is, each unit only has 0 and 1 two states. Although SLC particles are the ancestors of SSD, they are also the fastest, the highest life, the strongest stability, the smallest capacity, and the most expensive product under the same conditions. Because of these characteristics, the civil market sees SLC particles, which is the first choice for enterprise users.

The MLC (Multi-Level Cell) is a revolutionary, and this type of particle officially announces that the price of SSD is finally accepted by civilian players. MLC, as the name suggests, each storage unit must store a 2-bit potential value, that is, each unit must have a total of 4 states of 00, 01, 10, and 11, which greatly improves the storage capacity under the same conditions. It is fast, has high life, strong stability, and average capacity, and the price is relatively high. Because of these characteristics, MLC particles officially correct the name of SSD. Unfortunately, due to the relatively high production cost and accurate price positioning, the MLC products on the market have been the first choice for installing the machine.

The emergence of TLC (Trinary-Level Cell) is also a revolution. If Samsung had braved the world many years ago to forcibly raise the price of its TLC products to the MLC price range, I believe that there will be more rejection of TLC particle users today. Choking is also related to the extremely poor performance caused by the quality control of particles and the perfection of the main control chip in the early days of TLC. Each memory cell of the TLC must store 3 bits of potential values, so each cell will have a total of 8 states of 000, 001, 010, 011, 100, 101, 110, and 111. TLC particle speed is average, life is average, stability is average, the capacity is relatively large, and the price is close to the people. With the application of 3D NAND technology and the improvement of the main control chip, TLC has become the dominant hegemon in the current SSD market.

QLC (Quad-Level Cell) related features after the above explanation, I believe that the smart students have summarized their own, each unit stores 4 bits of information, a total of 16 states. As a new thing, QLC also needs me to be patient enough and test the market, if QLC products can pull the SSD price range down a lot, I believe it will also have a significant impact on the popularity of SSD.

Above I mentioned that the SSD will have a bad bus occupation, but this part of the content is also combined with the hard disk product transfer protocol for auxiliary digestion. The so-called transmission protocol is also known as the transmission specification and transmission standard, which means that the data transmission method is carried out.

(1) The IDE protocol is a good old mechanical hard disk transmission protocol, and it is necessary to discuss it.

(2) Although the AHCI protocol performs better, it is also a needle mechanical hard disk and was born, so it is discussed in depth.

(3) SATA protocol is the most widely used transmission protocol, with faster transmission speed, and high execution efficiency, but also supports hot swap, the vast majority of hard disks on the market are also using SATA protocol, the current SATA 3. X has met all the needs of the civil market.

(4) NVMe protocol is specially designed for flash memory product development and transmission protocol, which is the optimal solution of the current SSD product transmission protocol, which can give full play to the performance of SSD products while reducing latency. It is the preferred protocol for M.2 interface SSDs.

At this point, there is a need to turn off the SSD to end literacy. If students are still reading more words about deeper knowledge, you must continue to pay attention to the explanations behind them or search for relevant knowledge to make up lessons.

Ordinary users said that the purchase recommendation is to buy the M.2 interface of the big factory to support the NVMe protocol to go PCI-E bus TLC particle products, if the storage capacity is higher demand, you have to buy SATA interface TLC or QLC products as storage disks.

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