Samsung's 850 EVO has reigned supreme in the SATA SSD market for a long time. It earned our recommendation when it launched all the way back in 2014 and has been the 800-pound gorilla of client SSDs ever since. Samsung was the first to produce a non-planar TLC NAND drive, and the 850 EVO's success has affected the shape of the entire SSD market since. Pick up a random SSD and peer inside, and the odds are high that you'll find 3D TLC NAND of some kind staring back at you.Non-planar NAND technologies–whether "3D," "BiCS," or "V-NAND"–have become the de facto standard for mainstream solid-state storage. And that's not likely to change soon, unless more exotic technologies  coalesce from the vapor. The only credible threat comes from quad-level-cell NAND . For now, QLC products seem to be targeted towards enterprise-y "write once, read many" workloads, where the technology's inevitably.