Root User Disabled by Default in OSX
Just to set the record straight.
The Root user account in OSX is disabled by default. To do anything as Root, you either need to enable the Root account (not recommended) or use the SUDO command to allow an Admin privileged user to perform Root functions.
Whenever an OSX machine is first setup, the initial user is an Admin account and NOT Root. This is a much safer configuration. Of course there are always additional areas to improve with OSX security such as enabling secure memory mode in the Security preference pane and enabling a password protected screensaver. Oh, yes, use a strong password and don't write it down.