Fsck And Root Script Boot Process

I'm a little bit confused. Please can you explain me how /etc/rc.d/fsck and /etc/rc.d/root init scripts are called during the boot process?

Actually on FreeBSD 8.3 i386, I expected that only root script is called. And on FreeBSD 8.3 amd64, only fsck script is called.

Thanks.
 
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