TEST: Western Digital WD_BLACK SN850 2TB M.2 SSD

Technical data
Image
Manufacturer	Western Digital
Model number	WDS200T1X0E-00AFY0
Storage capacity	2048 GB (1863 GiB)
pSLC-Cache	224 GB approx.
Read speed	7000 MB/s
Write speed	5100 MB/s
Interface	PCIe 4.0 x4
Connection	M.2 2280
Memory module (NAND)	TLC
DRAM Cache	✓ yes
TBW (Total Bytes Written)	1200 Terabyte
Controller	WD 20-82-10034-A1
Price	ca. 445 AUD (= 0,22 $ / GB)
Paid link	Buy on Amazon

Compare Product

Compared to the top performer*

Read speed

95 %

Write speed

73 %

*) Test result evaluated according to AS SSD Score within the same size.

This SSD is PS5 compatible. It can be used in a PlayStation 5 console as expansion storage.

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	5801,10 MB/s	5096,68 MB/s
4K in megabytes per second	66,44 MB/s	192,91 MB/s
4K-64Thrd in megabytes per second	2399,71 MB/s	2641,19 MB/s
Access time in milliseconds	0,018 ms	0,094 ms
Score	3046	3344
Total score	7911

Copy Performance Test

A common everyday situation 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 (the cache remains enabled). The practical test of May 05, 2021 shows the performance for simultaneous write and read operations. The lower the duration, the better the performance.

AS SSD Copy-Benchmark	Transfer rate:	Duration:
ISO two large files	2041,46 MB/s	1,13 s
Program many small files	164,05 MB/s	42,91 s
Game small and large files	1923,69 MB/s	3,59 s

Compression Performance Test

Here, the writing and reading speed of the the Western Digital SSDSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 7000MB/s and 5100MB/s respectively).

CrystalDiskMark Benchmark

Here, two sequential and two random performance tests are performed, similar to the ones performed on the AS SSD.

CDM	Read [MB/s]	Write [MB/s]
SEQ1M Q8T1	7070,26	5189,83
SEQ1M Q1T1	4269,34	5163,23
RND4K Q32T16	3553,43	2846,33
RND4K Q1T1	72,28	238,73