TEST: Western Digital WD Blue SN550 250GB M.2 SSD

Technical data
Image
Manufacturer	Western Digital
Model number	WDS250G2B0C
Storage capacity	250 GB (233 GiB)
Read speed	2400 MB/s
Write speed	950 MB/s
Interface	PCIe 3.0 x4
Connection	M.2 2280
Memory module (NAND)	TLC
DRAM Cache	no
TBW (Total Bytes Written)	150 Terabyte
Controller	WD 20-82-01008-A1
Price	ca. 34 USD (= 0,14 $ / GB)
Paid link	Buy on Amazon

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Compared to the top performer*

Read speed

66 %

Write speed

25 %

*) 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 1348 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	2008,39 MB/s	426,30 MB/s
4K in megabytes per second	38,04 MB/s	172,32 MB/s
4K-64Thrd in megabytes per second	420,40 MB/s	204,63 MB/s
Access time in milliseconds	0,024 ms	0,294 ms
Score	659	420
Total score	1348

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 November 20, 2020 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	1365,97 MB/s	0,79 s
Program many small files	783,95 MB/s	1,79 s
Game small and large files	1391,23 MB/s	0,99 s

Compression Performance Test

This measures the write and read speed of the the Western Digital SSDSSD is measured depending on the compressibility of the data (according to the manufacturer, these should be 2400MB/s and 950MB/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	2391,52	674,50
SEQ1M Q1T1	1607,58	670,71
RND4K Q32T16	541,01	368,37
RND4K Q1T1	45,26	186,13

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.

The benchmark test was performed on November 20, 2020.
Information about the test system can be found at the bottom of the home page.
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