Western Digital WD_BLACK SN850P 2TB M.2 SSD

We put the Western Digital NVMe M.2 SSD through a detailed test. You can find the test result / test report here:

AS SSD Benchmark

Standard performance test

The standard test was performed with a 5 GB file. A total score of 8771 points was achieved.

AS SSD	Read:	Write:
Seq in megabytes per second	6,150.34 MB/s	5,894.32 MB/s
4K in megabytes per second	79.23 MB/s	230.02 MB/s
4K-64Thrd in megabytes per second	2,588.35 MB/s	3,000.37 MB/s
Access time in milliseconds	0.017 ms	0.080 ms
Score	3283	3820
Total score	8771

Copy performance test

A common everyday scenario 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 (cache remains enabled). The real-world test from 22 June 2026 shows performance during simultaneous write and read operations. The lower the duration, the better.

AS SSD Copy Benchmark	Transfer rate:	Duration:
ISO two large files	2,150.06 MB/s	1.07 s
Program typical program folder with many small files	1,161.26 MB/s	6.06 s
Game a game folder with small and large files	1,944.20 MB/s	3.55 s

Compression performance test

Here, speed is measured depending on how compressible the data is.

CrystalDiskMark Benchmark

Similar to AS SSD, two sequential and two random performance tests are carried out here and the write and read speed (manufacturer specs: 7300 MB/s and 6600 MB/s) the Western Digital SSD is measured.

CDM	Read [MB/s]	Write [MB/s]
SEQ1M Q8T1	7,361.88	6,668.29
SEQ1M Q1T1	5,180.48	5,897.82
RND4K Q32T16	4,245.38	3,522.70
RND4K Q1T1	84.82	263.69

HD Tune Pro long-term test

A long-term test was performed to fully utilize the storage. You can see at what point the cache (if present) becomes full and write performance drops. A test file of 400 GB was written to the medium. The exact cache size could not be determined because the test file did not exhaust (push to the limit) the cache. The test file could at least be read with an average read speed of 6,248 MB/s and written at 5,869 MB/s.

ATTO Disk Benchmark

Here, a 256 MB file is written to the Western Digital NVMe M.2 SSD multiple times. The I/O block size varies (from 512 bytes to 64 megabytes). The larger the blocks, the faster writing and reading usually becomes.

SSD-Z Benchmark

Similar to HD Tune, a 500 MB file is written to the Western Digital NVMe M.2 SSD here. The transfer data is displayed. The more consistent the line, the better. Unfortunately, the tool no longer works correctly from around 4,000 MB/s and no line is displayed (and sometimes incorrect min/max data is shown).

smartctl: Supported Power States & LBA Sizes

   === START OF INFORMATION SECTION ===
Model Number:                       WD_BLACK SN850P for PS5 2000GB
Serial Number:                      26023F801388
Firmware Version:                   620311WD
PCI Vendor/Subsystem ID:            0x15b7
IEEE OUI Identifier:                0x001b44
Total NVM Capacity:                 2á000á398á934á016 [2,00 TB]
Unallocated NVM Capacity:           0
Controller ID:                      8224
NVMe Version:                       1.4
Number of Namespaces:               1
Namespace 1 Size/Capacity:          2á000á398á934á016 [2,00 TB]
Namespace 1 Formatted LBA Size:     512
Namespace 1 IEEE EUI-64:            001b44 8b4fdc71e7
Local Time is:                      Mon Jun 22 14:40:36 2026 MS
Firmware Updates (0x14):            2 Slots, no Reset required
Optional Admin Commands (0x0017):   Security Format Frmw_DL Self_Test
Optional NVM Commands (0x00df):     Comp Wr_Unc DS_Mngmt Wr_Zero Sav/Sel_Feat Timestmp Verify
Log Page Attributes (0x1e):         Cmd_Eff_Lg Ext_Get_Lg Telmtry_Lg Pers_Ev_Lg
Maximum Data Transfer Size:         128 Pages
Warning  Comp. Temp. Threshold:     90 Celsius
Critical Comp. Temp. Threshold:     94 Celsius
Namespace 1 Features (0x02):        NA_Fields

Supported Power States
St Op     Max   Active     Idle   RL RT WL WT  Ent_Lat  Ex_Lat
 0 +     9.00W    9.00W       -    0  0  0  0        0       0

Supported LBA Sizes (NSID 0x1)
Id Fmt  Data  Metadt  Rel_Perf
 0 +     512       0         2
 1 -    4096       0         1

The benchmark test review was performed on 22 June 2026.
You can find information about the test system at the bottom of the homepage.
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