128KB SEQUENTIAL READ/WRITE
Sequential performance is measured similarly to the other two tests before. The drive is first secure erased to get it in a clean state. Next, we precondition the drive with a 128KB sequential write workload at QD256 until the drive is in a steady state. Finally, we cycle through QD1-256 for 5 minutes each for writes and then reads. All this is scripted to run with no breaks in between. The last hour of preconditioning, the average MB/s, and average latency for each QD is graphed below.
Sequential results are mostly in line with the 524MB/s rating, however, we can see there is some mild variability where it dips down to 490MB/s. Latency averages in the high side of 64ms as well.
The Toshiba HK4R and Samsung PM863 both show their dominance during the sequential read tests. From QD2-32 the HK4R and PM863 are very close in performance with the Samsung edging out slightly. Latency maintains under 8ms until QD32.
In sequential write testing the surprisingly beat out both the Samsung and Micron SSD. At QD4-32 it maintained a speed of nearly 520MB/s and latency maxed out at an average of 8ms.