Due to the increasing capacity of SSD hard disk, NAND flash memory has gradually shifted from SLC and MLC to TLC and QLC. In particular, QLC is a choice for low-end SSD in recent years. One of its criticisms is that the performance is too slow. Now Western Digital and Kaixia have optimized the QLC performance on the new generation bics6 flash memory, which has been improved by five times.
There are two main reasons why QLC flash memory is not liked by everyone. One is poor reliability, and the other is that the writing performance is very weak. This is determined by the characteristics of QLC flash memory. After all, 4bit data should be controlled in the cell unit. Programming and writing is much more complex than other flash memory, resulting in high error rate and slow speed.
You have also seen the hard disk performance of QLC flash memory. Although the writing speed given by the manufacturer exceeds 1GB / s or even 2GB / s, it is improved by technologies such as SLC cache, full cache and DRAM cache. The original writing speed of QLC is very low, and the performance outside the cache is worse than that of HDD Hard disk, and there are almost none exceeding 100MB / s**
There is no QLC flash memory type in the current main flash memory bics5 of Western Digital and armor man. The next generation bics6 flash memory will reintroduce QLC flash memory and carry out a lot of performance optimization. Not only the core area is lower than that of other manufacturers, but also the programming speed (i.e. writing speed) has been increased to 60MB / s.
What is this concept? Although it doesn't look high, the QLC programming speed of the previous generation of bics4 flash memory is only 9.7mb/s. At present, the fastest QLC flash memory is Intel's 144 layer QLC flash memory, with a speed of 40MB / s, and most of other manufacturers are within 30MB / s**
In short, the speed of QLC in bics6 flash memory of Western Digital and armor man has increased five times than before, and the performance of QLC has also increased by 50% compared with that of the fastest QLC of friends, which is enough to greatly improve the writing performance of QLC flash memory SSD hard disk. See the details after the finished product.