I can't install grub2

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http://askubuntu.com – I can't install grub2 on my system. i followed the guide, but when i chroot on my ubuntu partition and type: grub-install /dev/sdb I get this error: root@ubuntu:/# grub-install /dev/sdb /usr/sbin/grub-setup: error: hd0 appears to contain a iso9660 filesystem which isn't known to reserve space for DOS-style boot. Installing GRUB there could result in FILESYSTEM DESTRUCTION if valuable data is overwritten by grub-setup (--skip-fs-probe disables this check, use at your own risk). Here is sudo fdisk -l output: Disk /dev/sdb: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 6 (HowTos)