MySQL file / database structure

[Karl Huber]

Hi!

I have a question about the file structure of mysql. Where are the users as e.g. root stored?
When I make a fresh install of mysql I have the data\mysql database in place then I add a secound database e.g. test. Is the root user stored then in both databases or is he only in the mysql database or somewhere else?
And if I change the password for the user root with the cmdline tool mysql is it necessary to select a database before with "use XXX" or not?

And if I wanna start from scratch on an running mysql server and therefore delet the data\mysql database is the root user lost then and how I recreate all I need then?


thanks
Karl