DiskMark is described as 'small utility that allows you to benchmark your disks and hard drives performance' and is an app in the OS & Utilities category. There are more than 10 alternatives to DiskMark for Windows, Mac, Online / Web-based and PortableApps.com. The best alternative is CrystalDiskMark, which is both free and Open Source. Other great apps like DiskMark are HD Tune (Freemium), UserBenchMark (Free), Blackmagic Disk Speed Test (Free) and Macrorit Disk Scanner (Free).
UserBenchmark is a free all-in-one benchmarking application. Benchmark your CPU, GPU, SSD, HDD and USB Drives then compare results with other users and see which parts you can upgrade together with the expected performance improvements. CPU benchmarks bias toward Intel.
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.