For free storage device benchmarking software, I highly recommend CrystalDiskMark.
The interface is nice, clean, and simple to use. And the results are easy to understand.
You can even record the test results by pressing Alt-PrintScreen (after the benchmarks have completed) to post to your website or blog for sharing and/or historical comparisons.
I’ll be using this program in my next blog post to test VeraCrypt’s (a free storage device encryption program) performance vs the same hardware.