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AW: Reinstalling grub?

> -----Urspr├╝ngliche Nachricht-----
> Von: Knute Johnson [mailto:knute frazmtn com] 
> Gesendet: Mittwoch, 11. Oktober 2006 01:24
> An: Fedora-list redhat com
> Betreff: Re: Reinstalling grub?
> >> I'm with you Nigel but how does grub know that the Linux drive is
> >> hdb?
> >>
> >Mainly because if you have 2 harddrives, and Windows is on 
> the first one 
> >(hda), Grub is not going to be on that, as it's a linux bootloader.
> >
> >Say for instance you only had one harddrive. You have 
> installed Windows first 
> >on the drive, so it is labelled as hda1, and boots up using 
> the windows 
> >bootloader, using ntldr. You now install FC5 on the same 
> drive (presuming 
> >that you have free space on the drive). You create a / 
> partition for FC5, say 
> >this is hda3, and a /home partition hda4. Grub is waiting to 
> be installed 
> >somewhere, and you are given options as to where you want to 
> install it 
> >during the OS install. The default option is the MBR, and if 
> you go for this 
> >Grub will be installed in the MBR of hda (where windows was 
> booting from), 
> >but will add a chainloader entry to /boot/grub/grub.conf , 
> so that you can 
> >not only boot up FC5, but Windows too, as you know.
> >
> >If you had to reinstall the Windows OS (a common occurence) 
> , the MBR would be 
> >taken over by the Windows bootloader (ntldr), and now you 
> need to reinstall 
> >Grub on the MBR (the situation you find yourself in). 
> >
> >You now load the 1st FC5 cdrom, and type linux-rescue. this 
> will give you 
> >options for the harddrive partition you want to work with. 
> You know that 
> >Windows is on hda1 so thats not the correct option, as Grub 
> isn't on that. 
> >The only other option should be hda3, which is the / 
> partition for FC5, and 
> >Grub is set up on that, but not installed to be used as a 
> bootloader at the 
> >moment. 
> >
> >Back to the linux-rescue disc, choose hda3 as the harddrive 
> partition, which 
> >will get you a command prompt. Type. chroot /mnt/sysimage . 
> this will get you 
> >another command prompt. Now you can put Grub wherever you 
> like, but were 
> >going to put back in the MBR of hda where the reinstall of 
> Windows had 
> >removed it from. So you type. grub-install /dev/hda  , and 
> if all goes well 
> >Grub should be reinstalled in the MBR of hda, and when you 
> next reboot you 
> >should get a Grub menu with options for FC5, and "other" 
> which will be 
> >Windows.
> >
> >I had a lot of problems with bootloaders initially when 
> working with Linux, 
> >but over time I have become more clued up as how how they work. 
> >
> >Post back if you still have problems in getting this working again.
> >
> >Nigel.
> Well, the good news is I'm back.  The bad news is, it didn't work.  
> Here is what I did:
> Booted from FC5 CD #1
> linux rescue
> chroot /mnt/sysimage
> /sbin/grub-install /dev/sda
> /dev/sdb1 does not have any corresponding BIOS drive
> So what does that mean?
> Thanks,
> -- 
> Knute Johnson
> Molon Labe...
Hello Knute,

mount your boot partition in your chroot environment, then run grub-install
again. If that doesn't work try 
grub-install --recheck /dev/sda 

best regards

Frank Jahn
(Netzwerkadministrator, RHCE, MCSA+M, MCSE)

Metzloser Stra├če 36
D-36355 Grebenhain

Tel.:  0049 (0) 6644 87242
Fax :  0049 (0) 6644 87 6242
E-Mail:         mailto:frank jahn robbe com
Homepage: http://www.robbe.com

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