Very neat, easy to use and intuitive

This has TWO buttons

Button 1: Looks like a gear and allows you to pick the drive to test and set a few test parameters.

Button 2: The START button - which is also the stop button.

Push gear and pick your drive - then push the start button and it will do a write followed by a read - with the results reported below. (This loops until you click start again.) It could not be simpler. I just check a flash drive I bought for my camera and I am happy to report the flash drive is what it claimed to be.

MeSudoku about Blackmagic Disk Speed Test