Some grub questions

[Kihara Muriithi]

Hi all,
 Thank you a lot Joseph Kubik and Paul Mora for your assistance in
earlier question. I am now dual booting Fedora 4 and Ubantu nicely.
This save all my music (On Ubantu) and I can practice for Red Hat.
Turned out a good way of learning grub inside out, well except I still
have a couple of question I would like some help on.
 Why does Linux need the file initrd.img-2.6.* ? My understanding is,
its where the kernel is hosted and end up on the swap partation when
the system is up. Now what doesn't add up is why save it in the hard
disk, instead of making a copy right from the Kernel while the system
is going up?
 I have been googling about for update-grub scripts. The articles out
there mention it when discussing other topics, but I haven't come
across an article with the script as the primary subject. Anyone know
of such an article for a curious person?
 finally, what designate a root partation. My understanding is its the
partation that holds /sbin/init. Now, my default ubantu installation
pointed the root to partation 5, while init was on partation 1,
throwing the whole hypothesis out of the window. How can one explain
that configuration. See your /boot/grub/menu.list for what I am saying
if I happen to be ambiguous.
 Thank you a lot in advance for your assistance

William
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