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From Super Grub Disk Wiki

Introduction

In some of the steps of Super Grub Disk documentation you will need to know which it is the notation for your GRUB partition in a Linux system. Here we will try to explain how to do it.

Quick Check

Open a terminal in GNOME: Applications -> System -> Terminal

Type:

fdisk -lu

you will see something like this:

Disk /dev/sda: 80.0 GB, 80026361856 bytes
255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors
Units = sectors of 1 * 512 = 512 bytes
Disk identifier: 0xf6bca237

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 109563299 54780626 7 HPFS/NTFS
/dev/sda2 109563300 151187714 20812207+ 83 Linux
/dev/sda3 151187715 156296384 2554335 82 Linux swap / Solaris

Usually you should search for the line that ends in Linux (Not Linux Swap / Solaris) and that means that:

/dev/sda2

is your grub partition.

Safe Check

Some advanced users have a /boot partition or several Linux partitions. Although is optional you can check if there is grub in there with these commands (Supposing you are trying sda3):

mkdir /mnt/test
mount -t ext3 /dev/sda3 /mnt/test
ls -l /mnt/test/boot/grub/menu.lst
ls -l /mnt/test/grub/menu.lst
umount /mnt/test

If both ls commands prompt: File not found it means that there is no grub in sda3 partition and that you should check another partition in turn.