AmorphousDiskMark

What AmorphousDiskMark is

AmorphousDiskMark is a free, open-source macOS app for measuring storage read and write performance in MB/s or IOPS. Sequential tests use 1 MiB blocks, while random tests use 4 KiB blocks; both offer queue depths from 1 through 1024. Users can select random or zero measurement data, choose test sizes from 16 MiB to 64 GiB, and set intervals from 0 seconds to 10 minutes. Results display read and write scores, with both MB/s and IOPS available in tooltips. Measurements can be copied as plain text, and the app can save a screenshot of its window. The product page lists macOS 10.9.5 or later, and the App Store describes the app as Mac-only. The maker says an internet connection is not needed after downloading it. The GitHub repository identifies the license as MIT. Repeated read/write measurements may shorten a storage device’s lifespan. Apple’s App Store listing says the developer indicates that the app does not collect data, but Apple notes that it has not verified that information.