Double checking grub-install ??

[William Case]

Hi;

I have to run fixmbr on my WindowsXP harddisk (sda).  I assume this use
of fixmbr will blow away my grub.  So after running fixmbr I will go to
my Fedora rescue disk and do:

grub-install --root-directory=/boot /dev/sdb

That is; I want grub stage1 on the mbr of sda while I want stage2 on
sdb /boot.

I am looking for confirmation that this is a correct strategy and the
proper use of the grub-install command.

-- 
Regards Bill;
Fedora 9, Gnome 2.22.2
Evo.2.22.2, Emacs 22.2.1