CrystalDiskMark by Hiyohiyo is a free to use HDD benchmarking tool that will help you measure the read/write speeds of your hard drives. Even though there is no version of CrystalDiskMark for Mac available at the moment, you can download other programs that can help you test and monitor the speed of your hard drives. The following list includes several applications that can replace CrystalDiskMark for Mac.
Feel free to add any alternative to CrystalDiskMark for Mac that you know of.
Suggest Alternatives
Use AmorphousDiskMark...
Great, but how to benchmark IOPS on Mac?