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drsoum 07-21-2007 10:47 AM

booting machine with linux on an external HDD without HDD connected
 
hello all,

as this is newbie land, my question is bound to be straightforward, but please bear with me.

i'm running ubuntu 7.04 off an external HDD (120GB over USB2.0). i have a WinXP on my internal HDD and i didn't want to touch it as it is my work laptop, so the full install was done on the external one. after installing ubuntu and all the updates, i shutdown, disconnected everything and went to sleep. the next morning when i tried to boot without the external drive and, i was scared half out of my mind with a grub 21 error, but after some research here i figured out it was the HDD. the system boots fine after i connect the external HDD again.

is there any way i can have the system boot using only the internal HDD (as a matter of convenience)? it's not very practical to connect my external HDD every time i boot (or even come out of hibernation). of course i'm talking about booting to the XP os only :)

thanks!

p.s. following is a copy of my grub.lst, maybe it'll prove useful (although it seems it's read-only - any tips on how to save changes to it?)

# 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 change this entry to 'saved' 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 10

## 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=535951d1-77e7-4e41-b8a2-5f9c44a20bd3 ro

## Setup crashdump menu entries
## e.g. crashdump=1
# crashdump=0

## default grub root device
## e.g. groot=(hd0,0)
# groot=(hd1,0)

## 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

## ## End Default Options ##

title Ubuntu, kernel 2.6.20-16-generic
root (hd1,0)
kernel /boot/vmlinuz-2.6.20-16-generic root=UUID=535951d1-77e7-4e41-b8a2-5f9c44a20bd3 ro quiet splash
initrd /boot/initrd.img-2.6.20-16-generic
quiet
savedefault

title Ubuntu, kernel 2.6.20-16-generic (recovery mode)
root (hd1,0)
kernel /boot/vmlinuz-2.6.20-16-generic root=UUID=535951d1-77e7-4e41-b8a2-5f9c44a20bd3 ro single
initrd /boot/initrd.img-2.6.20-16-generic

title Ubuntu, kernel 2.6.20-15-generic
root (hd1,0)
kernel /boot/vmlinuz-2.6.20-15-generic root=UUID=535951d1-77e7-4e41-b8a2-5f9c44a20bd3 ro quiet splash
initrd /boot/initrd.img-2.6.20-15-generic
quiet
savedefault

title Ubuntu, kernel 2.6.20-15-generic (recovery mode)
root (hd1,0)
kernel /boot/vmlinuz-2.6.20-15-generic root=UUID=535951d1-77e7-4e41-b8a2-5f9c44a20bd3 ro single
initrd /boot/initrd.img-2.6.20-15-generic

title Ubuntu, memtest86+
root (hd1,0)
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/sda2
title Microsoft Windows XP Professional
root (hd0,1)
savedefault
makeactive
chainloader +1

Lenard 07-21-2007 11:40 AM

Re-install the Windows boot loader to the internal drive. Re-install grub to the external drive. This way Windows will boot without the external hard drive connected and ubuntu 7.04 or Windos will boot with the external hard drive connected.

Boot with the installation media and use fixmbr and maybe fixboot;

http://www.microsoft.com/resources/d....mspx?mfr=true

Got one of those BAD dumb idea restore CD/DVD images instead of a real Windows XP installation CD/DVD??? Then make your own;

http://support.microsoft.com/kb/310994
http://www.nu2.nu/bootcd/#wxp

.

drsoum 07-22-2007 03:47 AM

got it!
 
thanks for the tip! it worked nicely


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