Each queue depth is tested for up to one minute or 32GB transferred, from a 64GB test file. Our test of sustained sequential reads uses queue depths from 1 to 32, with the performance scores computed as the average of QD1, QD2 and QD4. The OWC Aura Pro X2 and other modern drives all provide a bit less than 1GB/s on the burst sequential read test, as does the more recent of the two Apple OEM SSDs, while the older Apple drive delivers worse performance than we now expect from a low-end SATA SSD. Between each burst the drive is given enough idle time to keep the overall duty cycle at 20%. The test averages performance across eight bursts for a total of 1GB of data transferred from a 16GB test file. Our first test of sequential read performance uses short bursts of 128MB, issued as 128kB operations with no queuing.
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