如题。
我有两块硬盘，
SATA接口，装XP sp3，被系统认成sda；
IDE接口，装ubuntu 9.04 DVD desktopi386，被系统认成sdb。
我是两块硬盘分别安装的。
每次进入ubuntu时都要拔硬盘。
如何设置，不用开机箱拔硬盘，可以在系统启动的时候选择操作系统，并默认启动XP？

请说的详细点，或者直接给我个文件，覆盖原文件。


刚才把两块硬盘都插上，并且BIOS里设置Hard Disk Boot Priority为：
1、Ch2 M ：ST3250310AS
2、Ch0 S ：SAMSUNG SP0812N
3、bootable add-in cards
重启后直接进入xp，但是无法进入ubuntu。

呵呵，我也是两个硬盘装的，其实只要设置一下BIOS就行了，设置默认HDD0，或HDD1就可以了，选HDD0就是XP，HDD1就是LINUX

贴上你的menu.lst啊，把grub装入sdb，BIOS设为sdb启动，加上以下内容即可

grub4dos。看置顶索引。

谢谢。因在linux下不能上网。
所以我不仅要解决双系统启动的问题，还要解决锐捷上网的问题。
而我，刚刚接触linux。
我自己摸索摸索吧。有问题再发。

bios设定以ubuntu所在的硬盘启动,

进入ubuntu后
改grub的menu.lst
sudo gedit /boot/grub/menu.lst

添加代码如下:

title WINXP PROFESSIONAL SP2
root (hd1,0)
map (hd1) (hd0)
map (hd0) (hd1)
makeactive
chainloader +1

grub启动后,"ESC"选择启动项.

上述代码放在其他启动选项的前面，grub启动后，不按“ESC”即会进入WinXP

终于能在ubuntu下上网了，折腾了一个晚上，累死了。（我用的是校园网，用ubuntu第二天。）
下面贴上我的menu.lst（完整），请大哥大姐们帮我看看怎么改。不知道“胖胖的蚊子”说的代码加在什么地方，怎么加。


# 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 3

## 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=e27f7742-097d-444a-a4f3-c36b1a9a2d38 ro locale=zh_CN

## default grub root device
## e.g. groot=(hd0,0)
# groot=e27f7742-097d-444a-a4f3-c36b1a9a2d38

## 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

## specify if running in Xen domU or have grub detect automatically
## update-grub will ignore non-xen kernels when running in domU and vice versa
## e.g. indomU=detect
## indomU=true
## indomU=false
# indomU=detect

## 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 9.04, kernel 2.6.28-11-generic
uuid e27f7742-097d-444a-a4f3-c36b1a9a2d38
kernel /boot/vmlinuz-2.6.28-11-generic root=UUID=e27f7742-097d-444a-a4f3-c36b1a9a2d38 ro locale=zh_CN quiet splash
initrd /boot/initrd.img-2.6.28-11-generic
quiet

title Ubuntu 9.04, kernel 2.6.28-11-generic (recovery mode)
uuid e27f7742-097d-444a-a4f3-c36b1a9a2d38
kernel /boot/vmlinuz-2.6.28-11-generic root=UUID=e27f7742-097d-444a-a4f3-c36b1a9a2d38 ro locale=zh_CN single
initrd /boot/initrd.img-2.6.28-11-generic

title Ubuntu 9.04, memtest86+
uuid e27f7742-097d-444a-a4f3-c36b1a9a2d38
kernel /boot/memtest86+.bin
quiet

### END DEBIAN AUTOMAGIC KERNELS LIST

按照上面的添加，第一启动项就是xp。

LS，你让他把XP启动项放在第一，以后更新到内核的时候好像会出问题

对，注意这句话：# Put static boot stanzas before and/or after AUTOMAGIC KERNEL LIST
所以应该放这里:

那应该怎么放？
把文件做好后给我吧。
是不是把

代码:

title WINXP PROFESSIONAL SP2
root (hd1,0)
map (hd1) (hd0)
map (hd0) (hd1)
makeactive
chainloader +1

放到

代码:

#添加的启动项

位置

因为我这台机子我妈妈也要用，妈妈是个电脑盲，所以必须要设置成默认XP启动。
而我，不想每次启动都要进入bios修改，再说用的是无线键盘，bios下不认。

hiddenmenu因该注释掉，要不然每次都要按键进入菜单的。
默认系统是哪个貌似和哪个default 0有关系。