Alex Schepeljanski of Alex Intelligent Software develops the free AS SSD Benchmark utility for testing storage devices. The AS SSD Benchmark tests sequential read and write speeds, input/output operational performance, and response times.
AS-SSD Benchmark uses compressed data, so sequential file transfer speeds may be reported lower than with other tools using uncompressed data. For this reason, we will concentrate on the operational IOPS performance in this section.
Beginning with sequential transfer performance, the Transcend ESD400 portable solid state drive produced 430MB/s for sequential reads and a somewhat disappointing 319MB/s for sequential writes. The 4K-64 thread test we concentrate on in this benchmark produced only 134MB/s reads and writes, both score of which are substantially better than those returned by the Samsung T3.
Transcend ESD400 USB SSD Results
The chart below summarizes AS-SSD 64-thread 4KB IOPS performance results among a variety of enthusiast-level SSDs. The ESD400 returns a very low score relative to the internal SSDs that comprise most of the chart, but manages to handily beat the Samsung T3. Bear in mind that no USB-attached drive can hope to do as well as a SATA drive on this test.
In the next section, Benchmark Reviews tests transfer rates using ATTO Disk Benchmark.