WD Black SN770 1TB 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.

In the 128KB Sequential read and write tests, the drive shows pretty consistent write performance from QD2 to the end of the test (QD32) confirming the official write figure of up to 4,900MB/s. When it comes to the read test runs there is a drop in performance at QD8 but the drive recovers quickly and it finishes the test run at 5,275MB/s, confirming WD's maximum read rating for the 1TB drive of 5,150MB/s.

128KB Sequential Read Performance v QD compared.

The 1TB Black SN770 performs best at lower queue depths when it comes to Sequential reads, being in the top three in QDs 1,2 and 4 but at QD32 it has sunk down to the bottom half of the results chart.

128KB Sequential Write Performance v QD compared.

In relation to the drives around it, the Black SN770's best Sequential write performance comes at QD1 where it sits mid chart. As the queue depth deepens it drops down the results chart.

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