HDD and SSD benchmark tool with a friendly graphical user interface.
If kdiskmark is not run as root it can rely on polkit to get the necessary privileges. In this case you must install it with environment.systemPackages on NixOS, nix-env will not work.
bin/kdiskmarkaarch64-linuxarmv5tel-linuxarmv6l-linuxarmv7a-linuxarmv7l-linuxi686-linuxloongarch64-linuxm68k-linuxmicroblaze-linuxmicroblazeel-linuxmips-linuxmips64-linuxmips64el-linuxmipsel-linuxpowerpc64-linuxpowerpc64le-linuxriscv32-linuxriscv64-linuxs390-linuxs390x-linuxx86_64-linux