Well, I dont understand the second part of your question (password?) but for the first part do this:
cp -R -f /dev/hdXX/ /path_to_copy_to
where hdXX is the hard drive from which you want to copy, and /path_to_copy_to is the path on the new hard drive onto which you want to copy the files. The -R -f makes the copy recursive, which means it'll copy everything in every directory, and the -f forces it to copy regardless of permissions or errors, and it won't ask you to confirm each and every file.
As I said, I don't get the other part of the quesiotn regarding the password, could you elaborate?