Popular SSD vendor uses clever trick to make slower, less durable flash components perform much better — but don’t expect miracles

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Although QLC NAND is capable of storing substantial amounts of data, it falls behind in performance when compared to other NAND types. Because it’s denser (housing four bits per cell) than TLC (which accommodates three), it’s typically slower and less robust.

Western Digital has employed a smart method to improve the performance and durability of its new SN5000S QLC flash drive. Thanks to the integration of a high-speed pseudo-SLC cache, over-provisioning of raw cells, and a controller that minimizes write amplification, it surpasses its TLC predecessor, SN740.



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