NAND flash memory has developed from SLC and MLC to TLC and QLC flash memory. Due to different technical principles, the performance, life and reliability of TLC and QLC are declining. In the future, there will be PLC flash memory, but it may be the most unpopular flash memory.
Because PLC flash memory can store five potentials, its capacity is 25% higher than QLC flash memory,Therefore, several major flash memory manufacturers are actively developing PLC flash memory, but the P / e life is estimated to drop to the 100 digit level, such as within 500 times.
From the perspective of consumers, we don't like PLC flash memory. The good news is that the industry has become conservative about the time when PLC flash memory will come out. Western Digital expects that the process from QLC to PLC flash memory will slow down,At least not until 2025, which means another four years.
Western Digital believes that it is very important for PLC flash hard disk to come into the market, and it also depends on the next generation of SSD master chip. Because PLC needs stronger error correction ability, the performance of the master chip is also more powerful, and the arm cortex-r8 kernel used now can't keep up with it.
Last year, arm launched a more powerful cortex-r82 architecture, supports 64 bit instruction set, supports up to 8 cores, supports complete Linux operation, and increases DRAM cache capacity to 1TB.
However, the new generation SSD master of R82 kernel will not be available until 2023-2024, and the first one is mainly used for high-performance server and data center market. It will not be equipped with PLC flash soon, so PLC hard disk still has to wait.
For players, it's not a bad thing for PLC to go on the market for a few years. On the one hand, manufacturers can continue to optimize the ability of PLC flash memory and master control. On the other hand, we don't have to worry about PLC flash memory in such a hurry.
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