OpenSUSE Install :: Error 22: No Such Partition

my desktop has two hdd(sda+sdb recognized as (hd1)and (hd0)respectively..)sda has vista on it. sda is comprised of several simple volumes which vista calls dynamic ntfs..sdb has four primary partitions: sdb1; sdb5,sdb6, sdb7. sdb5,6,7 are extended partitions,together put as sdb2.

sdb5 for swap, sdb6 for (/)(does this mean root partition? but /root and /home are on the same level..), sdb7 for /home; this is suse 11.0.I delete the last simple volume of sda, and divided it into three partitions: sda8,9,10. sda8 for swap, 9 formatted as ext3 for /home, 10 formatted as ext4 for /.And I want to keep the current grub, so I chose the boot loader location to "Boot from Root Partition" in Boot Loader Settings. At the last minute of installtion, a dialog tells me:

Code:

grub> setup --stage2=/boot/grub/stage2 --force-lba (hd1,9) (hd1,9)
Error 22: No such partition
grub>quit
(hd1,9) is surely sda10 which is mounted to '/'. why would grub not recognize this partition?

This error message always shows up whenever I boot to "rescue installed system" from dvd and try to reinstall grub to root partition, ie. (hd1,9). I tried to put one entry in the menu.lst of suse 11.0 :

Code:

title openSUSE 11.2
rootnoverify (hd1,9)
chainloader +1

But instead of boot into 11.2, it gives me a message "No such a partition"Until now the only successful boot into suse is through the dvd rescue mode-> boot into installed systems. later tries all failed.. with a message "modprobe: FATAL: Could not open.ko", the screen freezed, number led indicator and caps lock led both flashing on and off. I had to press the RESET on the box..

the good thing is suse 11.0 is still bootable, the current grub not crumbled..but the strange is grub cannot be installed. maybe it's due to ext4 format? In 11.0 if I try to mount /dev/sda10 to /mnt, it would say unknown file system 'ext4'.