Add Windows XP to the GRUB menu

1. Back up GRUB configuration file.
   cp /boot/grub/menu.lst /root/backup/menu.lst.grub.bak
   cp /boot/grub/menu.lst /boot/grub/menu.lst.bak
2. Add Windows XP boot up option in the GRUB menu.
   Vi /boot/grub/menu.lst
   add following lines in the menu.lst:
   title Windows XP
   map (hd0) (hd1)
   map (hd1) (hd0)
   root (hd1,0)
   chainloader +1
   
   
   
   
   Note:
   map (hd0) (hd1)
   map (hd1) (hd0)
   This two lines are called "virtual swap" which can solve windows installed on second harddisk.
   root (hd1,0) (hd1,0)means on second harddisk's first partition.