Grub hard drive question - root (hd0,0)
 

I am configuring grub and I want to know if my boot partition is /dev/hda2 does that mean the argument for root should be root (hd0,2)?

/boot should be (hd0,1) if its /dev/hda2.

So if boot is the second hda2 and root is the 3rd hda3 the it should like this:

default 0
timeout 19

title=gentoo
root (hd0,1)
kernel /boot/kernel root=dev/hda3

##############

(hda3 being the / partition here)

Yes it will work.

Never done it before myself as my distroa are always in single partitions. That mean /boot is always inside the root partition of every Linux.

However I have use regularly a kernel from Linux A to boot Linux B. To me you just pick up the kernel in hda2 to boot the Linux in hda3.

Grub always counts from 0 but the parameter root=/dev/hda3 is Linux-related and for the kernel's benefit. By that time Grub has finished its work, to pass control to the kernel and on the way for its long lunch break.