The Samsung 860 QVO (1TB, 4TB) SSD Review: First Consumer SATA QLC
 

The introduction of four bit per cell (QLC) NAND flash memory continues with Samsung's launch of their first consumer SATA SSD with QLC NAND. The new 860 QVO establishes a new entry-level tier in Samsung's highly successful SSD product family. Unlike previous low-end offerings like the 750 EVO and the plain 850, the 860 QVO is getting a broad release and is here to stay.

https://www.anandtech.com/show/13633...qvo-ssd-review