Modern data centers require high-capacity, energy-efficient SSD storage ... 61.44TB of TLC NAND. Previously, in order to deliver a capacity of 61.44TB, manufacturers needed to use QLC NAND ...
This is why QLC (and TLC) SSDs use a pseudo-SLC (pSLC) cache, which allocates part of the SSD’s Flash to be only used with the much faster SLC access pattern. In the earlier referenced tutorial ...