Pure Storage differentiates its product lines based on the type of NAND flash used, optimizing for either performance or capacity/cost.
FlashArray//X uses TLC (Triple-Level Cell) flash for high performance and endurance. These modules typically have orange tabs.
FlashArray//C and FlashArray//E are designed for high-capacity, capacity-optimized workloads. They utilize QLC (Quad-Level Cell) flash.
QLC flash stores 4 bits per cell, offering higher density at a lower cost per terabyte, but with different endurance characteristics managed by the DirectFlash software. To help engineers and customers physically distinguish these modules, QLC DirectFlash Modules feature gray release tabs on the carrier. Identifying these tabs confirms that the correct media type is being installed into the capacity-oriented //C or //E chassis.
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