where is grub

[wakatana]

Hi all, i am reading about USB bootable and it points me to grub in tutorial is issued command:
grub
grub> find /boot/grub/stage1

but it gives me: Error 15: File not found


i do not have any problems with grub, i can choose between M$ and Linux while boot

so when i issue:
sudo fdisk -l
i see which partition is bootable (sda1)
i have multiple partitons
sda1, sda2, sda3, sda4

sda1 windows
sda2 linux
sda3 swap
sda4 ntfs

so my question: how can i know where is grub installed ?
I found on net that is in directory /boot/grub/stage1 (sda2 in my case)
but why I have bootable sda1 ?? can anyody explain that ?

another question: I found grub can be installed on a partition

grub> setup (hd0,0)

or on a MBR

grub> setup (hd0)

. How can i know where is ?

last question: can i issue i think in my case command:

grub> root (hd0,1)

(sould be sda2 where i expecting grub) and then command:

grub> find /boot/grub/stage1

should gives output ?

realy last question: I create bootalbe usb with unetbootin which uses syslinux, is possible to boot M$ located on HDD throught that ? Thanks a lot

[wakatana]

Seems that i answer 2nd question

sudo dd if=/dev/sda bs=512 count=1 | od -a | grep G

gives me GRUB but

sudo dd if=/dev/sda1 bs=512 count=1 | od -a | grep G

did not gives nothing

[wakatana]

I thing I ve found solution so
/boot/grub/ contains grub files that are too big to store in MBR so they have to be located somewhere in hdd.

grub> root(hd0,0)

now works i forget sudo

but still i would know if is possible from unetbootin created USB boot directly to harddisk partition (i dont want to press ctrl alt del)