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本人一块320g sata硬盘装winxp，一块pata48g硬盘（sdb）装ubuntu 8.10，先安装xp后装ubuntu。grub安装在48g硬盘上 ，安装完成后，进入ubuntu正常，而winxp不能加入。
下面是fdisk -l的数据：

Disk /dev/sda: 320.0 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0xe9c1e9c1

Device Boot Start End Blocks Id System
/dev/sda1 * 1 1275 10241406 7 HPFS/NTFS
/dev/sda2 1276 38913 302327235 f W95 Ext'd (LBA)
/dev/sda5 1276 8924 61440561 7 HPFS/NTFS
/dev/sda6 8925 19123 81923436 7 HPFS/NTFS
/dev/sda7 19124 36970 143355996 7 HPFS/NTFS
/dev/sda8 36971 38913 15607116 b W95 FAT32

Disk /dev/sdb: 48.5 GB, 48504334336 bytes
255 heads, 63 sectors/track, 5896 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0005fdfb

Device Boot Start End Blocks Id System
/dev/sdb1 * 1 1216 9767488+ 83 Linux
/dev/sdb2 1217 5896 37592100 5 Extended
/dev/sdb5 5715 5896 1461883+ 82 Linux swap / Solaris
/dev/sdb6 1217 5714 36130122 83 Linux

Partition table entries are not in disk order

Disk /dev/sdc: 40.0 GB, 40020664320 bytes
16 heads, 63 sectors/track, 77545 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Disk identifier: 0x72a298cd

Device Boot Start End Blocks Id System
/dev/sdc1 * 1 77545 39082648+ c W95 FAT32 (LBA)

下面是menu.lst内容：
# menu.lst - See: grub(8), info grub, update-grub(8)
# grub-install(8), grub-floppy(8),
# grub-md5-crypt, /usr/share/doc/grub
# and /usr/share/doc/grub-doc/.

## default num
# Set the default entry to the entry number NUM. Numbering starts from 0, and
# the entry number 0 is the default if the command is not used.
#
# You can specify 'saved' instead of a number. In this case, the default entry
# is the entry saved with the command 'savedefault'.
# WARNING: If you are using dmraid do not use 'savedefault' or your
# array will desync and will not let you boot your system.
default 0

## timeout sec
# Set a timeout, in SEC seconds, before automatically booting the default entry
# (normally the first entry defined).
timeout 5

## hiddenmenu
# Hides the menu by default (press ESC to see the menu)
#hiddenmenu

# Pretty colours
#color cyan/blue white/blue

## password ['--md5'] passwd
# If used in the first section of a menu file, disable all interactive editing
# control (menu entry editor and command-line) and entries protected by the
# command 'lock'
# e.g. password topsecret
# password --md5 $1$gLhU0/$aW78kHK1QfV3P2b2znUoe/
# password topsecret

#
# examples
#
# title Windows 95/98/NT/2000
# root (hd0,0)
# makeactive
# chainloader +1
#
# title Linux
# root (hd0,1)
# kernel /vmlinuz root=/dev/hda2 ro
#

#
# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST

### BEGIN AUTOMAGIC KERNELS LIST
## lines between the AUTOMAGIC KERNELS LIST markers will be modified
## by the debian update-grub script except for the default options below

## DO NOT UNCOMMENT THEM, Just edit them to your needs

## ## Start Default Options ##
## default kernel options
## default kernel options for automagic boot options
## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
## kopt_2_6_8=root=/dev/hdc1 ro
## kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=e58e9320-fd61-4572-80d6-1cf2ab3872ca ro locale=zh_CN xforcevesa

## default grub root device
## e.g. groot=(hd0,0)
# groot=e58e9320-fd61-4572-80d6-1cf2ab3872ca

## should update-grub create alternative automagic boot options
## e.g. alternative=true
## alternative=false
# alternative=true

## should update-grub lock alternative automagic boot options
## e.g. lockalternative=true
## lockalternative=false
# lockalternative=false

## additional options to use with the default boot option, but not with the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash

## should update-grub lock old automagic boot options
## e.g. lockold=false
## lockold=true
# lockold=false

## Xen hypervisor options to use with the default Xen boot option
# xenhopt=

## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0

## altoption boot targets option
## multiple altoptions lines are allowed
## e.g. altoptions=(extra menu suffix) extra boot options
## altoptions=(recovery) single
# altoptions=(recovery mode) single

## controls how many kernels should be put into the menu.lst
## only counts the first occurence of a kernel, not the
## alternative kernel options
## e.g. howmany=all
## howmany=7
# howmany=all

## should update-grub create memtest86 boot option
## e.g. memtest86=true
## memtest86=false
# memtest86=true

## should update-grub adjust the value of the default booted system
## can be true or false
# updatedefaultentry=false

## should update-grub add savedefault to the default options
## can be true or false
# savedefault=false

## ## End Default Options ##

title Ubuntu 8.10, kernel 2.6.27-8-generic
uuid e58e9320-fd61-4572-80d6-1cf2ab3872ca
kernel /boot/vmlinuz-2.6.27-8-generic root=UUID=e58e9320-fd61-4572-80d6-1cf2ab3872ca ro locale=zh_CN xforcevesa quiet splash
initrd /boot/initrd.img-2.6.27-8-generic
quiet

title Ubuntu 8.10, kernel 2.6.27-8-generic (recovery mode)
uuid e58e9320-fd61-4572-80d6-1cf2ab3872ca
kernel /boot/vmlinuz-2.6.27-8-generic root=UUID=e58e9320-fd61-4572-80d6-1cf2ab3872ca ro locale=zh_CN xforcevesa single
initrd /boot/initrd.img-2.6.27-8-generic

title Ubuntu 8.10, kernel 2.6.27-7-generic
uuid e58e9320-fd61-4572-80d6-1cf2ab3872ca
kernel /boot/vmlinuz-2.6.27-7-generic root=UUID=e58e9320-fd61-4572-80d6-1cf2ab3872ca ro locale=zh_CN xforcevesa quiet splash
initrd /boot/initrd.img-2.6.27-7-generic
quiet

title Ubuntu 8.10, kernel 2.6.27-7-generic (recovery mode)
uuid e58e9320-fd61-4572-80d6-1cf2ab3872ca
kernel /boot/vmlinuz-2.6.27-7-generic root=UUID=e58e9320-fd61-4572-80d6-1cf2ab3872ca ro locale=zh_CN xforcevesa single
initrd /boot/initrd.img-2.6.27-7-generic

title Ubuntu 8.10, memtest86+
uuid e58e9320-fd61-4572-80d6-1cf2ab3872ca
kernel /boot/memtest86+.bin
quiet

### END DEBIAN AUTOMAGIC KERNELS LIST

# This is a divider, added to separate the menu items below from the Debian
# ones.
#title Other operating systems:
#root


# This entry automatically added by the Debian installer for a non-linux OS
# on /dev/sda1
title Windows XP
root (hd0,0)
savedefault
chainloader +1


请问是何处出问题，该如何修改？

你改过硬盘的次序吗？？bios 中哪块硬盘作为第一硬盘？？

48g的pata硬盘为第一硬盘

XP那里改成这样试试

adagio 写了：XP那里改成这样试试

代码： 全选

title		Windows XP
root		(hd1,0)
map		(hd0) (hd1)
map		(hd1) (hd0)
chainloader	+1
savedefault

如果这样还不行，再试试
ps，48 G 的容量不多见啊，一般都是 40 60 。。

48g的是我的一个60g硬盘维修坏道后才变成48g,多谢楼上各位指点，回去再试试看。


都试过了，还是不行

跟LZ一样，现在每次都进bios切换系统,什么时候搞定了通知一声

我启动成功了，
title Windows XP
map {hd0} {hd1}
map {hd1} {hd0}
chainloader(hd1,0) +1

我启动成功了，
title Windows XP
map {hd0} {hd1}
map {hd1} {hd0}
chainloader(hd1,0) +1

如果你的XP引导文件的确位于这里的话（看看这个分区里是否有一个ntldr文件） 那么使用5楼提供的两种写法，其中之一肯定可以启动

如果还是不行的话，再确定一下你的grub会不会是装到了320G那个硬盘，如果是的话，应该写成这样