Western Digital Black SN850 2Tb SSD tech review

Posted on November 07, 2022 by Raymond Chen

Should you buy Black SN850 (2Tb) produced by Western Digital and extra specs explore in our article.

Western Digital Black SN850 2Tb SSD tech review

Western Digital's 2Tb Black SN850 SSD use SanDisk 8-Channel controller. The drive write a data location map on Dynamic-Random Access Memory DDR4 to launch a programs faster. The Black SN850 comes equipped with 96L Bics4 memory. SSD is offered also in 1 Tb and 500 Gb capacities.

Performance and benchmarks

SSD works on PCIe M.2 4.0 x 4 bus with sequential write speeds 5100 MB/s, and read speeds 7000 Mbps. Black SN850 has input/output performance 710000 on writing and 1000000 on reading operations.

Endurance and warranty

Manufacturer give 5 years warranty limited by endurance 900 TBW. The Black SN850 has 1.75 million hours MTBF.


Category Value
Capacity 2 Tb
Interface M.2 4.0 x 4
Controller SanDisk 8-Channel
Memory type 96L Bics4
Read speed (Mb/s) 7000
Write speed (Mb/s) 5100
Read IOPS 1000000
Write IOPS 710000
Endurance (TBW) 900
MTBF (million hours) 1.75
Warranty (years) 5


Western Digital Black SN850 2Tb support PCIe 4 that is significantly faster than PCIe 3.0. The sequential write speed is 5100 Mbps, that is faster than has other rivals. The NVMe SSD can write 900 TBW, that is bad in comparison with closest rivals. Overall, our editor highly recommend to buy Western Digital Black SN850 2Tb for your PC.

+ Pros

  • Excellent writing speed
  • PCIe 4.0
  • Capacity

- Cons

  • Writing speed

Buy this or similar SSD:

Video Review

WD Black SN850 NVMe M.2 SSD - it's toasty!


The Western Digital Black SN850 has DDR4. DRAM makes storage work faster, but also more expensive.

The Western Digital Black SN850 2Tb due to the high density of memory chips require the installation of extra heat sink. It reduce temperature of the controller and memory. Some motherboards designed with thermal pads above or below the storage to enhance productivity during high loads.

The Black SN850 2Tb has sequential write speed 5100 Mb per second, sequential read speed 7000 Mb/s. NVMe run on SanDisk 8-Channel controller and M.2 4.0 x 4 high-speed serial computer expansion bus standard. The memory type is 96L Bics4.
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