[ubuntu-uk] dual boot

[Tom Bamford]

norman wrote:
>> If I'm following correctly, the Ubuntu drive is SATA. Therefore it
>> doesn't come into master/slave debate.
>>     
>
> That is correct and interesting. Does that mean I could just plug in
> another SATA drive without having to worry about setting jumpers etc?
>   
I don't have much experience with SATA drives so my help is limited. I 
believe you can have one SATA drive per header/connector meaning no need 
for jumpers. Some controllers are hot swappable so you can plug drives 
in and out without turning off your machine (except for the drive you 
are booting from of course).

>> Assuming the Ubuntu drive is fully working and Grub is installed to the
>> MBR, can you post the menu.lst and device.map files the from /boot/grub/
>> directory to the pastebin (or to this list)? Then we can see the current
>> configuration and maybe make suggestions about what needs to be changed.
>>     
> Please explain to this ignorant one what is the MBR and how do things
> get installed there?
>
> There have been no changes made to menu.lst other than the few lines
> right at the end which I was advised to put there, these are:-
> title Windows
> map (hd0) (hd1)
> map (hd1) (hd0)
> rootnoverify (hd1,0)
> chainloader +1
>
> device.map is simply:-
>
> (hd0) /dev/sda
>
> I would have thought there should be some reference to hd1.
>   

Grub doesn't update the device.map unless you ask it to, so new drives 
don't get immediately recognised. You can run the 'update-grub' script 
from a terminal on the live CD to have Ubuntu rewrite the file, although 
I don't think there's any harm in editing it yourself. In any case 
you'll need an extra line in device.map for your second drive:

(hd0) /dev/hda

Not sure if your other drive will be /dev/hda, it could also be hdb, hdc 
or hdd, depending on which controller it's connected to and whether it's 
the master or slave to your optical drive.

Tom

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