Western Digital WD_BLACK SN850 2TB M.2 SSD

We put the Western Digital NVMe M.2 SSD through a detailed test. You can find the test result / test report here:

AS SSD Benchmark

Standard performance test

The standard test was performed with a 5 GB file. A total score of 7911 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	5,801.10 MB/s	5,096.68 MB/s
4K in megabytes per second	66.44 MB/s	192.91 MB/s
4K-64Thrd in megabytes per second	2,399.71 MB/s	2,641.19 MB/s
Access time in milliseconds	0.018 ms	0.094 ms
Score	3046	3344
Total score	7911

Copy performance test

A common everyday scenario is simulated here. Three test folders are created:

• ISO (folder with two large files)
• Program (folder with many small files)
• Game (folder with small and large files)

The three folders are copied using the Windows copy command (cache remains enabled). The real-world test from 05 May 2021 shows performance during simultaneous write and read operations. The lower the duration, the better.

AS SSD Copy Benchmark	Transfer rate:	Duration:
ISO two large files	2,041.46 MB/s	1.13 s
Program typical program folder with many small files	164.05 MB/s	42.91 s
Game a game folder with small and large files	1,923.69 MB/s	3.59 s

Compression performance test

Here, speed is measured depending on how compressible the data is.

CrystalDiskMark Benchmark

Similar to AS SSD, two sequential and two random performance tests are carried out here and the write and read speed (manufacturer: 7000 MB/s and 5100 MB/s) the Western Digital SSD is determined.

CDM	Read [MB/s]	Write [MB/s]
SEQ1M Q8T1	7,070.26	5,189.83
SEQ1M Q1T1	4,269.34	5,163.23
RND4K Q32T16	3,553.43	2,846.33
RND4K Q1T1	72.28	238.73

HD Tune Pro long-term test

A long-term test was performed to fully utilize the storage. You can see from when a possible cache is full and write performance drops. A test file of 250 GB was written to the medium. After approx. 224 GB, the cache was full and performance was throttled.
The test file could at least be read with an average read speed of 5,303 MB/s and written at 3,789 MB/s.

HD Tune Pro Benchmark

HD Tune writes a 5 GB file to the Western Digital NVMe M.2 SSD. The transfer data of the read speed is displayed graphically. The minimum, maximum and average values are also determined. The measured access time and burst rate are also shown.

ATTO Disk Benchmark

Here, a 256 MB file is written to the Western Digital NVMe M.2 SSD multiple times. The I/O block size varies (from 512 bytes to 64 megabytes). The larger the blocks, the faster writing and reading usually becomes.

SSD-Z Benchmark

Similar to HD Tune, a 500 MB file is written to the Western Digital NVMe M.2 SSD here. The transfer data is displayed. The more consistent the line, the better. Unfortunately, the tool no longer works correctly from around 4,000 MB/s and no line is displayed (and sometimes incorrect min/max data is shown).

The benchmark test review was performed on 05 May 2021.
You can find information about the test system at the bottom of the homepage.
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