WD Blue SN580 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.

As with the random read testing when it came to random writes our 4-threaded test results were nowhere near the official maximum figure of 750,000 IOPS, the best we saw was 411,304 IOPS at QD32.

4K Random Write v QD compared.

Compared with the drives around it, the SN580 performs the poorest at QD1, and even then it's still in the top 10 drives. But as the queue depth deepens the performance improves so at QDs 2 and 4 it's sitting in second spot and at QD32 it's sitting on top of the pile.

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