For SSDs, this test also reveals if the drive has a pseudo-SLC cache, which is a small portion of faster-programmed flash that absorbs incoming write workloads. ![]() data to see when (or if) thermal throttling kicks in and how it impacts performance. When possible, we also log the temperature of the drive via the S.M.A.R.T. We tossed in this one last test to measure the performance of the drive over a 15-minute window. Write speed and temperature are two important and inter-related metrics for external devices. And, scaling out to a QD of 4 or even 128 doesn’t improve performance much, but rather just exaggerates latency. This results in an IOPS throughput of 113 IOPS read and 286 IOPS write, which is just a fraction of what something like the SanDisk Extreme or other SSDs are capable of. Seagate’s Backup Plus Ultra Touch boasts random read latency that comes in at ~8.8ms read and 3.5ms write. During sequential transfers, performance peaked out at 132MBps read/write. ![]() On average, Seagate’s Backup Plus Ultra Touch ranks last overall.
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