Crucial entered the portable SSD market relatively late, with their X6 and X8 PSSDs being the mainstay for many years. Based on QLC NAND, they were marketed for read-intensive use-cases, though the generous amount of SLC cache ended up delivering good write performance too for mainstream consumers - particularly in the X8. Recently, the company also started focusing on the prosumer / power users market with the launch of the X9 Pro and X10 Pro. Based on Micron's 176L 3D TLC NAND, these drives came with guaranteed write speeds.
