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WD Black SN850 1TB SSD Review

To test the real-life performance of a drive we use a mix of folder/file types and by using the FastCopy utility (which gives a time as well as MB/s result) we record the performance of drive reading from & writing to a 256GB Samsung SSD850 PRO.

We use the following folder/file types:

  • 100GB data file.
  • 60GB iso image.
  • 60GB Steam folder – 29,521 files.
  • 50GB File folder – 28,523 files.
  • 12GB Movie folder – (15 files – 8 @ .MKV, 4 @ .MOV, 3 @ MP4).
  • 10GB Photo folder – (304 files – 171 @ .RAW, 105 @ JPG, 21 @ .CR2, 5 @ .DNG).
  • 10GB Audio folder – (1,483 files – 1479 @ MP3, 4 @ .FLAC files).
  • 5GB (1.5bn pixel) photo.
  • BluRay Movie – 42GB.
  • 21GB 8K Movie demos – (11 demos)
  • 16GB 4K Raw Movie Clips – (9 MP4V files).
  • 4.25GB 3D Printer File Folder – (166 files – 105 @ .STL, 38 @ .FBX, 11 @ .blend, 5 @ .lwo, 4 @ .OBJ, [email protected] .3ds).
  • 1.5GB AutoCAD File Folder (80 files – 60 @ .DWG and 20 @.DXF).


WD’s Black SN850 displayed a very good consistency of performance for both reads and writes when dealing with the larger file sizes in our file transfer tests. It averaged 518MB/s for writes and 449MB/s for reads in the top six of the larger file transfers.

To get a measure of how much faster PCIe NVMe drives are than standard SATA SSDs we use the same files but transfer to and from a 512GB Toshiba OCZ RD400:


Switching over to the NVMe drive to transfer data to and from the WD Black SN850 saw transfer speeds for the large file transfers rocket and times taken drop dramatically. Eight of the transfers topped well over 2GB/s while two topped 1GB/s.

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