WD Black SN850 1TB SSD Review

1. Introduction2. WD Black SN850 1TB3. Testing Methodology4. CrystalDiskMark5. ATTO Disk Benchmark6. AS SSD7. IOMETER8. 128KB Sequential Performance9. 4K Random Read v QD Performance10. 4K Random Write v QD Performance11. 4K 70/30 Mixed Performance12. Throughput13. PCMark 10 Full System Drive Benchmark14. Performance Stability15. Real Life File Testing16. Closing Thoughts17. View All Pages

In our read throughput test, the drive peaks at the 8MB block mark at 5,550.23MB/s before dropping back to finish the test run at 5,499MB/s.

Despite falling short of the official maximum of 7,000MB/s, the WD Black SN850 has the fastest read speed in our throughput test by quite some margin.

In our write throughput test, the drive peaks at the 4MB block mark at 5,631.74MB/s, which is some 331MB/s faster than the official rating of 5,300MB/s.

As with our read throughput test, the write throughput performance puts the WD Black SN850 at the top of the pile by an even bigger margin than the read performance.

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