Blackmagic Disk Speed Test

You want to test your hard drive's speed? You want to learn if your hard drive is capable for working with high quality video? If the answer is yes, then Blackmagic Disk Speed Test is your only choice! And the best part? It's completely free in the Mac App Store!

Below is the description and download link.

Disk Speed Test is an easy to use tool to quickly measure and certify your disk performance for working with high quality video! Simply click the start button and Disk Speed Test will write test your disk using large blocks of data, and then display the result. Disk Speed Test will continue to test writes and reads from your disk so you can evaluate both performance and readability over time.

[Download link]