[root@amd64 grub]# fdisk -l
Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 4097 32909121 7 HPFS/NTFS
/dev/sda2 4098 38913 279659520 f W95 Ext'd (LBA)
/dev/sda5 16896 29693 102799903+ 7 HPFS/NTFS
/dev/sda6 4098 15875 94606722 83 Linux
/dev/sda7 15876 16895 8193118+ 82 Linux swap / Solaris
/dev/sda8 29694 34792 40957686 83 Linux
Partition table entries are not in disk order如上，sda6是第一个安装的linux系统，sda7是swap盘，sda8是后装的linux系统。因此，目前生效的grub配置在sda8上，如需进入不同的系统，需要修改sda8上的grub配置文件。继续，如果系统进入到sda6的配置文件时，也是grub配置文件。再继续，如果进入到win7时，再使用win的ldr配置文件。
[root@amd64 grub]# cat grub.conf
# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE: You do not have a /boot partition. This means that
# all kernel and initrd paths are relative to /, eg.
# root (hd0,7)
# kernel /boot/vmlinuz-version ro root=/dev/sda8
# initrd /boot/initrd-version.img
#boot=/dev/sda
default=1
timeout=10
splashimage=(hd0,7)/boot/grub/splash.xpm.gz
hiddenmenu
title RHEL5.5-2 (2.6.18-194.el5)
root (hd0,7)
kernel /boot/vmlinuz-2.6.18-194.el5 ro root=LABEL=/1 rhgb quiet
initrd /boot/initrd-2.6.18-194.el5.img
title RHEL5.5-1
rootnoverify (hd0,5)
chainloader +1
title Windows7
rootnoverify (hd0,0)
chainloader +1如上配置，默认的是自0开始计数的第一个操作系统，即RHEL5.5-1
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