WD Black SN770 1TB SSD Review

CrystalDiskMark is a useful benchmark to measure theoretical performance levels of hard drives and SSDs. We are using v8.0.

Using the default CrystalBenchMark 8 benchmark we could confirm the official read/write maximums of 5,150MB/s and 4,900MB/s with test results of 5,227MB/s and 4,993MB/s for read and writes respectively.

Looking at both benchmark result screens it appears that the new WD controller doesn't have a preference for what type of data it's being asked to handle.

Using the 4K QD1 Thread 1 test produces a read score of 83.85MB/s which is strong enough to see the drive in third place in our results chart but its write score of 232MB/s isn't as strong.

When the drive was tested with the Peak Performance profile in CrystalDiskMark 8 we could again confirm the official maximum read/write Sequential ratings of 5,150MB/s and 4,900MB/s with a read result of 5,227MB/s (default) and a best write result of 4,990MB/s (0 fill).

The official random 4K ratings for the 1TB Black SN770 are up to 740,000 IOPS for reads and up to 800,000 IOPS for writes. We couldn't match either of these maximums with CrystalDiskMark's Peak Performance profile but with a best test result of 725,446 IOPS the read performance was much closer to the official maximum than the 604,317 IOPS write figure.

Using the Real World profile, the Sequential score of 4,628MB/s was good enough to see the Black SN770 at the top of the results table. However, its write result of 4,973MB/s wasn't nearly as strong when compared to drives around it in the results chart.

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