TEST: Western Digital WD_BLACK SN7100 2TB M.2 SSD

Technical data
Image
Manufacturer	Western Digital
Model number	WDS200T4X0E-00CJA0
Storage capacity	2048 GB (1863 GiB)
pSLC-Cache	>300 GB approx.
Read speed	7250 MB/s
Write speed	6900 MB/s
Interface	PCIe 4.0 x4
Connection	M.2 2280
Memory module (NAND)	TLC
DRAM Cache	no
TBW (Total Bytes Written)	1200 Terabyte
Controller	Western Digital Polaris 3
Price	ca. 135 USD (= 0,07 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

97 %

Write speed

88 %

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

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

AS SSD Benchmark

Standard performance test

The standard test was performed using a 5 GB file. A total score of 7078 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	6072,87 MB/s	5366,52 MB/s
4K in megabytes per second	87,45 MB/s	179,98 MB/s
4K-64Thrd in megabytes per second	1890,04 MB/s	2475,37 MB/s
Access time in milliseconds	0,020 ms	0,101 ms
Score	2585	3192
Total score	7078

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 26, 2025 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	2388,51 MB/s	0,96 s
Program many small files	1161,23 MB/s	6,06 s
Game small and large files	1911,92 MB/s	3,61 s

Compression Performance Test

This measures the write and read speed of the Western Digital SSD, depending on the compressibility of the data (according to the manufacturer, these should be 7250 MB/s and 6900 MB/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	7235,55	6225,62
SEQ1M Q1T1	5462,14	5291,73
RND4K Q32T16	4101,63	2575,23
RND4K Q1T1	103,88	210,15

HD Tune Pro Endurance test

This is a long term test to make full use of the memory capacity. You can see when a cache is full and the writing performance decreases. A test file of 300 GB was written to the medium. The exact cache size could not be determined, because the test file did not exhaust the cache (brought it to the limit). At least the test file could be read with an average write speed of 6203 MB/s and written with 5786 MB/s.

HD Tune Pro Benchmark

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

ATTO Disk Benchmark

Here, a 256 MB file is written several times to the Western Digital M.2 SSD. The I/O block size varies (from 512 bytes to 64 megabytes). The larger the blocks, the faster they were written and read.

SSD-Z Benchmark

Similar to HD Tune, a 500 MB file is written to the Western Digital M.2 SSD here. The transfer data is displayed. The more constant the line, the better. Unfortunately, the tool does not work correctly above about 5,000 MB/s and no line (and sometimes wrong min and max data) is displayed.

The benchmark test was performed on May 26, 2025.
Information about the test system can be found at the bottom of the home page.
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