It's the first Samsung SSD to use QLC NAND - but is it any good? We are gradually seeing more and more SSDs, both SATA and NVMe based, being launched into the market using the latest 4-bit or QLC NAND flash technology. The latest drive to hit the market is the 4TB flagship drive of Samsung’s SSD 860 QVO range – the company’s first drive family to use 4-bit NAND.