Re: chainloader +1, again

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On Mon, 22 Mar 2010 17:10:49 -0400, Gene wrote:

> On Monday 22 March 2010, Will Walthall wrote:
> >So I made the assumption that your part layout was /dev/sdb1 f10
> >system, /dev/sdb2 f12 system.
> >
> >Option #1 Install grub to the MBR of /dev/sdb
> >Option #2 Install grub to the partition of /dev/sdb1
> >
> >Lots of things you need to consider, one you dont want to break
> >
> >Do you Chainload into mandriva aswell? is the Mandriva boot installed
> >to MBR /dev/sdd or in the partition /dev/sdd1?
> >
> >Steps I would take:
> >:Reinstall grub to the MBR of /dev/sda and make sure that it has these 3
> >: devices
> >
> >-grub prompt in f10-
> >device (hd0) /dev/sda  //f10
> >device (hd1) /dev/sdb  //f12
> >device (hd2) /dev/sdd  //mandriva
> >root (hd0,0)
> >setup (hd0)
> 
> This did not return any errors, so I am off to try it.
> 
> And, and hour later, it failed, error 13. Invalid file format or some such 
> drivel.
> 
> The hour was because it decided to do an e2fsck on /usr, which is something 
> over half a Tb.
> 
> >Option #1
> >
> >:Reinstall grub to the MBR of /dev/sdb
> >
> >device (hd0) /dev/sdb  // This grub is isolated from the MBR one on
> >/dev/sda so I believe this is correct, I've never done something like
> >this personally, though I've messed around with grub alot
> >root (hd0,0)
> >setup (hd0)
> >
> >: Make sure all your entries in menu.lst for f10 are correct
> >
> ># Again I think this is correct, though I haven't done anything like
> >this, I have chainloaded into grub installed to a partition, but not
> >into one installed to another MBR on a seperate drive
> >title Fedora 12
> >root (hd1,1)
> >chainloader (hd1)+1
> 
> Now I have done this, and will try it.  And this reverts to the grub screen 
> from /dev/sda in about 4 seconds, silently.

Why did you try that?  root (hd1,1) expands to /dev/sdb2 which is not
what you had referred to earlier.

  # load boot sector of first partition (sdb1)
  title Fedora 12
  rootnoverify (hd1,0)
  chainloader +1

Assuming that F12's GRUB _really_ is installed in /dev/sdb1 and NOT the MBR.

And if it's installed in the MBR, you could boot F12 by changing the boot
order in your BIOS, then use "grub-install" to (re-)install the boot loader.
Make sure that you don't mix /dev/sda1 and /dev/sdb1 when running grub-install.
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