[MertsA]

You need to understand what systemctl disable is really doing. "Enabling" in systemd means look at the unit file and see what target should start it when enabled and then it goes and adds a symlink to that target. Masking is replacing the unit file entirely so that systemd doesn't even load it. In systemd, you can have unit files in /etc, /run, or /usr. If there is a file in /usr and /etc with the same name, /etc takes priority. By masking a unit that you want to block, you're just creating a symlink to /dev/null. Disabling a service might not be what you want to do as that service might just be a dependency of what you really want to stop. Disabling a unit just removes the explicit dependency to that unit from a particular target but that doesn't mean that the unit can't be started, just that it won't be started unless something else pulls it into the dependency tree.