As a leader in the domestic storage industry, Changjiang storage has attracted widespread attention due to its rapid development in 3D NAND flash memory field in recent two years. In particular, it has created a new xtacking flash memory architecture and recently created the first consumer grade SSD brand “Zhiti”. Today, < / P > < p > first of all, it is worth mentioning that Changjiang storage company was registered and established in 2016, but in fact, as early as 2014, Wuhan Xinxin began to develop 3D NAND, so the history of Changjiang storage has been six years. In terms of products, < / P > < p > in terms of products, the first batch of TSDs produced by Changjiang storage Co., Ltd. is composed of two products, sc001 has a write life of 170-680tbw, and pc005 has a write life of 200-640tbw. < / P > < p > from the parameter point of view, the write life of Zhiti series is not shorter than that of similar products, even longer than many of them, and the testing and certification of products are based on industry standards. < / P > < p > titanium series algorithms are common in the industry, but the write amplification needs particles to carry, and the xtacking architecture of Changjiang storage can indirectly help to improve the write life. < / P > < p > this is because the xtacking architecture separates the process of flash memory array from that of CMOS logic device. To this extent, it is easier to adjust and optimize the process of flash memory array by using xtacking technology, and the service life is relatively longer. < / P > < p > in addition, the wear balance management methods used by the Changjiang storage industry are the same, and the fault modeling is similar to other peers in the same industry, and it may even be better in some aspects. Yangtze River storage will use a lower redundancy method to manage bad blocks, and when the redundancy is reduced, the write life will naturally be improved. In terms of future planning, PCIe 4.0 is in the ascendant, and Changjiang storage is also actively preparing. However, because pcle 4.0 is relatively new, Changjiang storage will consider introducing different series of low, medium and high-end products, which will have performance and price segmentation, and reduce power consumption as much as possible. < / P > < p > when it comes to 3D NAND flash memory, major flash memory manufacturers around the world are stacking more layers. Recently, Meguiar has announced 176 layers and Changjiang storage has achieved 128 layers. < / P > < p > there are several indicators for the capacity of 3D NAND. One is to see how many blocks are in the chip, and the other is to see how many flash transistors are in each block. If there are more layers, the capacity in a block will naturally increase. < / P > < p > however, with more layers, the overall capacity is not necessarily larger, because more or fewer blocks can be designed at the same time. The capacity of each block of Changjiang storage is about 50% more than that of other products in the industry. < / P > < p > in addition, there is no unified standard for the capacity of each layer of flash memory, which can only be said to be roughly uniform. Therefore, there is no direct comparability between the stack layers of different manufacturers. < / P > < p > in fact, the stacking of 3D NAND layers also faces some challenges. For example, as the number of layers increases, it becomes more and more difficult to achieve the length width ratio required by the holes. It was estimated that the length width ratio could only reach about 100 layers. Now, this limitation has been greatly broken through, but the difficulty is getting higher and higher. < / P > < p > this is just like semiconductor technology. 7Nm and 5nm were almost unthinkable more than a decade ago, but now they have been realized. Major breakthroughs have been made in 3nm and 2nm, but the challenge is increasing exponentially. < / P > < p > with better equipment and better process adjustment capability, Changjiang storage has finally reached 128 layers of flash memory, and it is possible to achieve 256 layers, 300 layers and 500 layers in the future. < / P > < p > of course, it is impossible to stack 3D NAND infinitely. Based on the current stacking mode, it is estimated that the limit is about 500 layers. However, a new method, equipment or theory will definitely be found by then, and it is also possible to break through to 500 layers. Spontaneous combustion at a Guangzhou Motor vehicle intersection and other traffic lights in Shenzhen