WD Black SN770 1TB SSD Review

We used CrystalDiskMark 8‘s custom settings to test the 4K random write performance of the drive through a range of queue depths. The setup for the tests is listed below.

Transfer Request Size: 4KB, Outstanding I/O: 1-32.

In the random write test, the best test result we saw from the 1TB SN770 was 375,676 IOPS (QD32). which is nowhere near the official maximum of 800,000 IOPS. We did a quick test of the drive using eight threads and got a test result of 422,055 IOPS, still well short of the official figure.

4K Random Write v QD Performance.

The drive sits around mid-table in all the tested queue depths until it comes to the final QD32 test when, just like the random read test, the drive moves to the top of the chart.

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