Install Grub/Lilo at the First Sector of the Boot Partition??
 

i have / boot at sda1,
/ at sda2

I would like to install Grub / Lilo at the first sector of the boot partition.
Where is the first sector of the boot partition? /boot or / ?
i know MBR is located at sda.
Thanks.

The boot partition is the partition where /boot is located. That could be the root partition ("/") but if as in you case it is on a seperate partition that's the one you want. So it's /dev/sda1 for you.

I was aware that MBR is not on any hardrive...that is why it is the "master boot record" and not the first partition of the first hardrive, like /boot is.
If you don't want to have problem with dual booting, then you must install in MBR, and not in /boot. As a matter of fact, you don't even need /boot at all...just skip making that partition and use the MBR.