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Publié : 28 août 2007
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Dual boot "Vindoze" Linux

Une collègue d’Ingrid m’a demandé comment résoudre un problème de dual boot. Voici ma réponse !

- Q. :> I have installed linux on a usb-lacie drive in my laptop. By following the proposed settings the grub file ended in the lacie, so I’m oblige to connect the lacie to start the computer (despite the fact that starts in windows as first option). I don’t like this. Do you know how can I avoid having to connect the usb-lacie all the time to start the computer ?

- R. : Ok, from what you tell me, windows was the first installed.


a) Do you still have the windows installation CDs ? (We won’t need them if everything works according to plan, but it’s to be on the safe side.)

DON’T DO THIS in the beginning, it’s an emergency plan : If your laptop doesn’t reboot, you must boot with the cd (I assume it’s VVVinXP), type "r" for repair when prompted and type "fdisk /MBR" to restore the Master Boot Record of Vindoz.

b) Read all that follows and make sure you have all the tools (command under linux : "dd, mcopy you can manage without that one, ...) (usb key, ...)

c) Have a look at the following url http://www.tldp.org/HOWTO/Linux+NT-Loader.html As I copied and adaptated point 3 & 4 from it.

2) Boot in Linux :

a) login as your normal user and in a terminal type : "df" , you will see some information on how your partitions are occupied.

yves@cerise:~\$ df
Sys. de fich.           1K-blocs       Occupé Disponible Capacité Monté sur
/dev/hdb1             20161172    604952  18532080   4% /
varrun                  192964       232    192732   1% /var/run
varlock                 192964         0    192964   0% /var/lock
procbususb              192964       240    192724   1% /proc/bus/usb
udev                    192964       240    192724   1% /dev
devshm                  192964         0    192964   0% /dev/shm
lrm                     192964     33788    159176  18% /lib/modules/2.6.20-16-generic/volatile
/dev/hdb3             40313996  14690884  23575228  39% /home
/dev/hdb8             10712900    133312  10035388   2% /opt
/dev/hdb5             50394964   7996480  39838528  17% /usr
/dev/hdb6             10080488    933364   8635056  10% /var
/dev/hdb7             20153140    131292  18998108   1% /var/www

Take note of the device of the /boot partition (If you don’t see it, It’s under "/" the root partition) It should be something like "/dev/sdaXX" where XX is a number. (I will assume XX to be 2 for the sake of simplicity : So let’s say it’s "/dev/sda2" from now on.)

Your windows disk must be under "/dev/hdaXX" (but maybe you won’t see it if you don’t access it under linux)

b) login as root and type "grub-install /dev/sda2"

#grub-install /dev/sda2

Your windows drive should now be grub free, DON’T reboot now ! (Or you will lose your access to linux.)

3) Now you have to peel the bootsector from your Linux-root-Partition. With /dev/sda2 as your linux-partition, the dd-command is :

# dd if=/dev/sda2 of=/bootsect.lnx bs=512 count=1

Copy the file bootsect.lnx to a floppy or to a USB key to transfer files to the NTFS-Windows-partition.

You can copy it with

# mcopy /bootsect.lnx a:

(on a diskette) or, (if you want to use a usbstick) with

# mount -t msdos /dev/sdb1 /mnt/usbkey
# copy /bootsect.lnx /mnt/usbkey
# umount /mnt/usbkey

(I assume here your usbstick will be put under /dev/sdb1 by the system. Maybe iy will be automagically "mounted"... again use df to probe its existence under linux) (Maybe under SUSE, it’s mounted under /media... I didn’t use SUSE for a long time sorry !)

4) Copy the file from the diskette to C :\\bootsect.lnx. I don’t tell you how to do that.

What lilo.conf is for linux is c :\\boot.ini for Windows NT. Remove the, system- and the read-only-attribute before you can modify it with :

C:\attrib -s -r c:\boot.ini

Now change the file boot.ini with an editor, notepad for example, as follows :

[boot loader]
[operating systems]
multi(0)disk(0)rdisk(0)partition(1)\WINNT="Windows NT Workstation ...
multi(0)disk(0)rdisk(0)partition(1)\WINNT="Windows NT Workstation ...

Only the last line has been added in this example. Restore the attributes after you have saved boot.ini with :

C:\attrib +s +r c:\boot.ini

After a shutdown of your Windows NT and a restart your should see the following :

 OS Loader V4.00

 Please select the operating system to start:

 Windows NT Workstation Version 4.0
 Windows NT Workstation Version 4.0 [VGA mode]

Select Linux and see

 grub ...