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Old 06-17-2008, 08:48 AM   #1
Keithj
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How to create a boot sector under Linux?


The hard drive that used to be drive C when this was a Windows machine, and then became hda under Linux, died a week or so ago. I replaced it with a new hard drive, and reinstalled all the stuff that was on there - nothing lost.

EXCEPT that it won't boot. Fortunately, I have a GRUB boot floppy so can still work, but NOWHERE can I find how to create a MBR or boot sector in Linux. Various sites suggest using a Windows 3.1 boot floppy and doing an FDISK /MBR - but surely that's a cop-out, and anyway I don't have a Win 3.1 boot floppy any more. The last one I had self-destructed years ago.

Is there really no Linux command that will create an MBR on hda?

Then, how do I get GRUB boot onto it? I have the menu.lst and all the rest. All I have to do once the GRUB floppy has started is type
configfile (hd0,0)/grub/menu.lst and off we go - with all the different distros on the machine available to select.
 
Old 06-17-2008, 09:06 AM   #2
johnsfine
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You list a few distributions, so even if I knew/remembered the right distribution specific details, I wouldn't know which to provide.

I did a quick google search and the top several hits I found were all just suggestions to get those instructions from man grub-install or info grub-install. I'm not at a Linux system now to check how obvious the answer will be within that man or info output.

You also might try Grub documentation, such as
http://www.gnu.org/software/grub/man...ode/index.html
Notice sections 3.2 and 3.3

Last edited by johnsfine; 06-17-2008 at 09:09 AM.
 
Old 06-17-2008, 09:33 AM   #3
linuxlover.chaitanya
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does grub-install not work in this case ?
 
Old 06-17-2008, 09:51 AM   #4
Bruce Hill
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I've never had a problem after issuing "liloconfig". I did have problems
trying to figure out the esoteric GrUB info, which seems to be where
this thread is heading.
 
Old 06-17-2008, 10:21 AM   #5
yancek
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You don't create an mbr you install grub to it. If you have a grub boot floppy, put it in the drive and at the grub prompt (grub>)type:

root (hd0,0)(assuming Linux is on sda1, hit enter)
setup (hd0)(hit enter)
quit(hit enter)
 
Old 06-17-2008, 01:40 PM   #6
jomen
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after you booted using the floppy:

check the file
/boot/grub/menu.lst
or
/boot/grub/grub.conf

if the contents are o.k. - should be the case if you partitioned your new drive the same way as your old one
(...and as you can use it to boot using the floppy)

then issue:

grub-install --no-floppy /dev/_your_device

and you should be good
 
Old 06-17-2008, 05:35 PM   #7
Keithj
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Thank you! So easy when you know how. Worked perfectly.

grub> quit brought up an error message "Error 27: Unrecognised command", but the reset button took care of that.

Job done!
 
  


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