GRUB help

[Rick Bowers]

At 2/6/2007 07:29 AM, you wrote:
>What hard drive and partition do / and /boot  live on?  (/dev/sda1?)

/       /dev/sdb3
/boot   /dev/sdb3


>Basically, you'll boot however you can (USB or live-CD) and reinstall the
>bootloader on the hard drive.

I'm not sure how to do this. I read the document at the link you 
supplied (below) but it isn't completely clear.
When I connect the USB drive, I get the GRUB boot menu. It looks like this:

Startup Options

                                 openSUSE 10.2                   /* 
this is on /dev/hdb3 */
                                 openSUSE 10.2 (/dev/sda)        /* 
An earlier attempt at loading openSuSE on /dev/sda2*/
                                 Windows                 /* My 
"production" setup on /dev/sda1 */
                                 openSUSE 10.2 (Failsafe)        /* 
Not sure who loaded this */

I need to be able to boot windows (/dev/sda1) when the USB drive 
(/dev/sdb) is unplugged. Perhaps this is not possible?


>Grub has a special way of looking at hard drives.  (look
>in /boot/grub/device.map for the actual specific mappings)
>/dev/sda1  == (hd0,0)  (assuming no hda's exist)
>/dev/sda2  == (hd0,1)
>  .....
>/dev/sdb1  == (hd1,0)
>/dev/sdb2  == (hd1,1)
>  .....
>/dev/sda    == (hd0)
>/dev/sdb    == (hd1)
>
>do you see the pattern?

Um, no?


>Assuming /boot lives on /dev/sda1:
>
>         $ sudo grub
>
>         grub>  root (hd0,0)
>         grub>  setup (hd0)
>
>This will set up your MBR on the first hard drive, and the grub will look for
>the  "second stage" of the loader on /dev/sda1.
>
>If you aren't sure where the grub files live, use
>         grub>  find /boot/grub/stage1

My output: (hd0,1) and (hd1,2)
I also did a "find /boot/grub/stage2" and got (hd0,1) and (hd1,2)


>The way grub works, if you know what's where, you can do a whole lot 
>from that
>errored boot screen.
>
>For more info:
>         http://orgs.man.ac.uk/documentation/grub/grub_3.html
>
>On Monday 05 February 2007 22:12, Rick Bowers wrote:
> > I just installed OpenSuSE on my USB drive from my laptop. It boots
> > fine -- iff the USB drive is connected. But if I try to boot with the
> > drive NOT connected, I get a GRUB error.
> >
> > The install never asked me where to put the boot record, so I"m
> > guessing it got put in the MBR of the internal drive.
> >
> > How can I fix this so my laptop boots from the internal drive when
> > the USB drive is not connected?
> >
> > ~Rick
> >
> > _______________________________________________
> > Linux-users mailing list ( Linux-users at linux-sxs.org )
> > Unsub/Password/Etc:
> > http://mail.linux-sxs.org/cgi-bin/mailman/listinfo/linux-users
> >
> > Need to chat further on this subject? Check out #linux-users on
> > irc.linux-sxs.org !
>
>--
>Matthew Carpenter
>mcarpenter at intelguardians.com
>http://www.intelguardians.com
>
>PGP Fingerprint:
>87EB 54A8 FB42 0A0E B8AE CDA7 FF99 2A64 E70F 4466
>hkp://wwwkeys.pgp.net
>
>
>_______________________________________________
>Linux-users mailing list ( Linux-users at linux-sxs.org )
>Unsub/Password/Etc: 
>http://mail.linux-sxs.org/cgi-bin/mailman/listinfo/linux-users
>
>Need to chat further on this subject? Check out #linux-users on 
>irc.linux-sxs.org !