Dualboot w7 + Arch ( where to install grub )

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https://bbs.archlinux.org – Why do you personally think grub will update to /dev/sda? Do you know how grub works that well?If Grub is installed on the partition, a grub update through pacman will not cause the MBR to be overwritten.That is not a personal opinion, that is a fact.If you yourselfe would update grub installed on a partition by adding another OS, /boot/grub/grub.cfg will be updated, it willnot be installed in the MBR.The only way grub will override the MBR is you doinggrub-install --target=i386-pc --recheck /dev/sdaOn a sidenote, why the hassle? Installing grub to the MBR, using os-prober to find windows, it (HowTos)