WD_Black SN770M 2TB 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.

Officially the WD_Black SN770M is rated at up to 800,000 IOPS for 4K random writes. Using our 4-threaded tests we fell a long way short of this mark, the best we saw was 564,908 IOPS (QD32).

4K Sustained Random Write v QD.

Even though our test result is a long way off the official figure it is still good enough to put the drive in the top 10 of Gen 4 drives we've tested to date and at QD32, it's the fastest drive we've seen to date.

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