Re: How to force os-prober to scan for new hard disk

[Barry Jackson]

On 20/03/11 20:08, Bernard Wu wrote:
> Hi Listers,
> I just added a new hdd to my dual boot machine. This new hard disk
> contains RHEL 5.5 with grub installed in its mbr.
> No matter how many times I run update-grub, it doesn't see this hard drive.
> However fdisk sees it as /dev/sdc. How dos I force os-prober to include
> this new disk when it does its scanning. I even tried modifying
> /etc/grub.d/40_custom with this syntax:
>
> menuentry "RedHat Enterprise Linux Server (2.6.18-194.el5)" {
> set root='(hd2)'
> chainloader +1
> }
>
> but when I select it, all it gives me is a blinking cursor and nothing
> happens.
>
> My current setup:
> disk 1 - sda - ubuntu 10.04.2 - grub2 installed in mbr
> disk 2 - sdb - win /xp professional - windows in mbr
> disk 3 ( new addition ) - sdc - RHEL 5.5 - grub 0.97 installed in mbr
>
> Any advice and suggestion will be much appreciated.
>
> TIA
> Bernie
>
>
>
>
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Try booting it directly - *something* like :-

menuentry 'RHEL' {
linux (hd2,1)/boot/vmlinuz
initrd (hd2,1)/boot/initrd.img
}

Since your RHEL drive had grub installed when it was not connected as 
hd2 it will not boot from it's MBR until it's grub has been set up again 
in it's current location. Likewise with menu.lst - all the entries will 
be pointing to the wrong places.

Barry