It's CentOS 5, 32 bit. It has 2x500GB WDC Black. RAID 1.
The problem is, the 1st HDD was broke. And when I try to boot from the 2nd HDD, it said:
GRUB Hard disk error
grub>find /grub/stage1 grub>root (hd0,0) grub>setup (hd0)