Grub system boot messed up after windows crash

Question

I have a dualboot system with Win XP and Arch. Yesterday Windows crashed while i was listening to music. Since then, when i boot my computer Grub throws an error message (i think it's error 17) and doesn't start the bootmanager. But if i boot from a normal Ubuntu-Live-CD an choose "boot from first harddisk" i get my grub manager and i am able to boot normally.
I tried to fix this by manually reconfigure grub like this:
1. Pop in the Live CD, boot from it until you reach the desktop.
2. Open a terminal window or switch to a tty.
3. Type "grub"
4. Type "root (hd0,6)", or whatever your harddisk + boot partition numbers are (my /boot is at /dev/sda7, which translates to hd0,6 for grub).
5. Type "setup (hd0)", ot whatever your harddisk nr is.
6. Quit grub by typing "quit".
7. Reboot.
(taken from http://ubuntuforums.org/showpost.php?p= … stcount=2)
It seems that my hdX is different to my sdX labels. sda is my linux harddisk, and sdc is my windows drive. But if i type root (hd0,0) i get "Filesystem type unknown, partition type 0x7", which means that this is an NTFS drive. So i tried root (hd2,0) (in my menu.lst, booting arch is also defined with hd2,0) and then i get "Error 21: Selected disk does not exist".
Now two questions:
1) Why is the labeling different? Why isn't sda1 = hd0 and so on?
2) How to restore my boot process? (this is slightly more important )

Answer 1

Alp wrote:
I think you both understood me wrong.
First, i don't need to alter the menu.lst, because grub doesn't show the boot choose menu at all. It just prints error 17 without any chance of doing something.
Second, i know the naming procedure. But obviously in my case hd0 and hd2 are switched, so that sda = (hd2) and sdc = (hd0). I don't know why.
well - you referred to 'sda1' as 'hd0' in your first post ...
as for the remapping of drives, there's always:
map (hd0) (hd2)
map (hd2) (hd0)