Never set root password

I installed Mandrake Cooker on a new partition on my machine, but never set the root password, so I can't log into it. Is there a way to change the password by booting into my working existing linux partition. I looked at the /etc/passwd file, but in place of the password field is a * which I guess means I'm using PAM or shadow passwords. Where are they stored?
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The encrypted passwd are stored in /etc/shadow.
You could boot in your existing Linux partition.
Mount the new partition over. Edit the /etc/shadow
file. Add the same encrypted string as your current
root login and you'll have the same password.

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