TEST: Western Digital WD_BLACK SN7100 1TB M.2 SSD

Technical data
Image
Manufacturer	Western Digital
Model number	WDS100T4X0E-00CJA0
Storage capacity	1024 GB (932 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)	600 Terabyte
Controller	Western Digital Polaris 3
Price	ca. 0 AUD (= 0,07 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

98 %

Write speed

90 %

*) 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 7221 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	5822,32 MB/s	5321,99 MB/s
4K in megabytes per second	87,80 MB/s	180,58 MB/s
4K-64Thrd in megabytes per second	1884,90 MB/s	2657,27 MB/s
Access time in milliseconds	0,020 ms	0,099 ms
Score	2555	3370
Total score	7221

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	2187,08 MB/s	1,05 s
Program many small files	1120,76 MB/s	6,28 s
Game small and large files	1916,65 MB/s	3,60 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 7250MB/s and 6900MB/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	7304,71	6195,83
SEQ1M Q1T1	4910,67	5363,35
RND4K Q32T16	4061,98	3056,38
RND4K Q1T1	103,32	212,82

HD Tune Pro Endurance test

A long-term test was performed here 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 5991 MB/s and written with 5685 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 can be written and read.

SSD-Z Benchmark

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