Bus-powered portable flash-based storage solutions are one of the growing segments in the consumer-focused direct-attached storage market. The emergence of 3D NAND with TLC and QLC has brought down the cost of such drives. NAND manufacturers like Western Digital, Samsung, and Crucial/Micron who also market portable SSDs have an inherent advantage in terms of vertical integration. Last year, Crucial/Micron had announced its entry into the segment with the QLC-based Crucial Portable SSD X8. A few months back, Crucial updated the lineup with a 2TB model while adding a lower-performance X6 member to the portfolio. Read on for our review of how these two high-capacity models fare in our evaluation.