TEST: Western Digital WD Blue SN550 1TB M.2 SSD

Technical data
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Manufacturer	Western Digital
Model number	WDS100T2B0C
Storage capacity	1024 GB (931 GiB)
pSLC-Cache	12 GB approx.
Read speed	2400 MB/s
Write speed	1950 MB/s
Interface	PCIe 3.0 x4
Connection	M.2 2280
Memory module (NAND)	TLC
DRAM Cache	no
TBW (Total Bytes Written)	600 Terabyte
Controller	WD 20-82-01008-A1
Price	ca. 89 USD (= 0,09 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

67 %

Write speed

61 %

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

AS SSD Benchmark

Standard performance test

The standard test was performed using a 5 GB file. A total score of 2846 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	2245,58 MB/s	1927,21 MB/s
4K in megabytes per second	47,41 MB/s	165,19 MB/s
4K-64Thrd in megabytes per second	935,42 MB/s	669,19 MB/s
Access time in milliseconds	0,023 ms	0,247 ms
Score	1207	1027
Total score	2846

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 December 23, 2023 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	1873,30 MB/s	1,23 s
Program many small files	1137,47 MB/s	6,19 s
Game small and large files	1726,14 MB/s	4,00 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 2400 MB/s and 1950 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	2445,89	2035,70
SEQ1M Q1T1	1834,41	2035,52
RND4K Q32T16	1605,67	1623,66
RND4K Q1T1	44,80	179,06

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 100 GB was written to the medium. After approx. 12 GB, the pSLC-Cache was full and the performance was throttled.
At least the test file could be read with an average write speed of 2299 MB/s and written with 919 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.

The benchmark test was performed on December 23, 2023.
Information about the test system can be found at the bottom of the home page.
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