GRUB Failing

[Agenor]

Hey friends, is the GRUB used to fail?
I have a system with 3 systems installed, Debian Redhat and Windows. The
GRUB is well configured and managing the three systems, but sometimes it get
in trouble so that none of the systems is initialized, returning a message
fail where it says the harddisk cannot be located. After that, I disconnect
the Windows HD (My system have 2 HDs, one for Linux and other for Windows),
launch again and the GRUB is working pretty well now. I would like to know
the GRUB´s real location, I think it´s on MBR, but I don´t know for sure.

title Linux Inicio
root (hd2,7)
kernel /boot/vmlinuz-2.6.9-67.EL ro root=LABEL=/1 rhgb quiet
initrd /boot/initrd-2.6.9-67.EL.img
title Red Hat Enterprise Linux AS (2.6.9-67.EL)
root (hd2,5)
kernel /boot/vmlinuz-2.6.9-67.EL ro root=LABEL=/1 rhgb quiet
initrd /boot/initrd-2.6.9-67.EL.img
title Debian GNU/Linux, kernel 2.6.18-5-k7
root (hd2,4)
kernel /boot/vmlinuz-2.6.18-5-k7 root=/dev/sda5 ro
initrd /boot/initrd.img-2.6.18-5-k7
savedefault
title Windows XP
rootnoverify (hd0,0)
chainloader +1

Thanks in advance!

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