WD_Black SN770M 2TB SSD Review

We used CrystalDiskMark 8‘s custom settings to test the Sequential read and write performance of the drive through a range of queue depths. The setup for the tests is listed below.

128KB Sequential Read / Write.

Transfer Request Size: 128KB, Thread(s): 1, Outstanding I/O: 1-32.

With this Sequential performance test, we can confirm the official Sequential ratings of 5,150MB/s and 4,850MB/s for read/writes respectively with peak test results of 5,233.97MB/s for reads and 4,891.6MB/s for writes. There is a large drop-off in the read performance at QD8 but the drive recovers quickly to finish the run at 5,233.97MB/s. Writes peak at QD4 and slowly drop away, finishing the test run (QD32) at 4,846.87MB/s.

128KB Sequential Read v QD compared

The drive sits in the top half of the Sequential read results table at QDs 1, 2 and 4 but by the end of the test run, it has fallen to near the bottom of the chart.

128KB Sequential Write v QD compared.

When it comes to the Sequential writes result tables, the drive doesn't get out of the bottom half of the table for the whole of the test run.

Become a Patron!