![]() With a multi-gear Low-Density Parity-Check (LDPC) ECC engine, RAID like protection for full multi-page recovery, internal SRAM ECC and end-to-end data path protection in its ECC scheme, along with the company over-provisioning the SSD by 9%, WD’s Black SN850 comes equipped with plenty of mechanisms to ensure your data is safe on the flash. The total dynamic SLC capacity spans roughly one-third of the available capacity (300GB on our 1TB sample) with a small and quick-to-recover static SLC cache (12GB on our 1TB sample) that's designed to provide the most performance and endurance. ![]() It now comes with a hybrid SLC caching that's similar to Samsung’s TurboWrite but larger in capacity, much like we're accustomed to with SSDs powered by Phison’s latest controllers. WD’s Black SN850 features a revamped SLC caching implementation, nCache 4.0. If you want the model with a heatsink, it will cost an extra $20. WD’s Black SN850 is available in capacities of 500GB, 1TB, and 2TB with street pricing listed at $150, $230, and $450, per respective capacity. With peak sequential performance up to 7/5.3 GBps of sequential read/write throughput and upwards of 1,000,000/720,000 random read/write IOPS, the WD Black SN850 delivers top-tier performance over the PCIe 4.0 x4 NVMe 1.4 interface.
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