Re: [opensuse] RE: Damaged Master Boot Record - Solved
- From: Registration Account <alpha096@xxxxxxxxxx>
- Date: Tue, 07 Aug 2007 16:05:11 +1000
I have successfully installed 10.2. I thought I would
explain what the problem was and how it was fixed.
Firstly I need to go over the IDE hardware setup.
There are 2 IDS BUS connectors.
The first has 2 LBA IDE HDD, however the disk at the
end of the ribbon is hardware configured as the slave
and the master is hardware configured between the two
ends of the ribbon.
The second IDE connector had the CD hardware configured
at the end of the ribbon and another LBA HDD hardware
configured as a slave between the two ends of the ribbon.
The other complexity, whilst not causing a problem, is
interesting as the system BIOS has a specification for
which HDD are the first, second, third and fourth
devices (NOTHING TO DO WITH BOOT ORDER) As All HDD are
the same model and capacity the 1st Master HDD was
positioned as the second device which is correct in so
far as its physical location on the cable.
The settings for the Boot preference priority was set
to CD/HDD/FDD which is true and correct as despite a
bootable image being loaded in the CD and the CD
nominated at the 1st priority; if the BIOS recognises
that the current CD media is bootable it ALWAYS asked
"hit any key to boot from CD". If media is present in
the CD and there is no bootable image and despite the
priority being set as above; no question is asked of
the user.
Therefore I partitioned the second HDD, which was in
fact the 1MHDD with a root mount point and gate it 20GB
formatted with ex3. I created a second partition with a
home mount point formatted with ex3 and a swap
partition formatted as such. I created and formatted a
swap partition of 1SHDD and 2MHDD.
System installed and up and running.
(This is an overhang that came from the first PC which
had only 1 FDD - one was A and the other B. The A drive
ALWAYS had the O/S the B the DATA. The convention that
no matter logically where drives are the only drive
which will boot is the First device and it matter not
what size (in the case of floppies) or placement on the
ribbon.
How I discovered the wrong physical location of the
1MHDD was to install Windoze XP - Its install program
formatted and copied files to the 1MHDD despite me
setting fdisk to format 1SHDD as drive C. That lead me
to think the same "1st Drive" concept in DOS and
Windows applied to Linux and there is logic behind this.
One day I will physically move the 1MHDD to the end of
the ribbon and the 1SHDD to the middle.
Lesson for me - even the teko shop sometimes gets
things wrong when putting in new HDD.
Thanks to all who have offered their suggestions to help
Scott
Jerry Feldman wrote:
On Sat, 04 Aug 2007 11:52:34 +1000
Registration Account <alpha096@xxxxxxxxxx> wrote:
What I need are 2 things.
1. How do I dismount all the drives to run fsck at Xterm?
2. How do I use fdisk to re-write MBR from xterm?
The second one might be difficult as there is plently
of info on re-creating a LiLO MBR but not GRUB on the
internet
The best way is to boot a rescue or disk or live CD, but...
Another way is to shutdown to single user mode. This should unmount all
but the root file system. You can always do a umount -a.
Make sure root is mounted read-only. (If I recall, in SuSE when
shutting down to single-user, it mounts read-only, but Fedora did not.
So, what I do is try to write to root, and if it fails I'm read-only.
The command to mount root readonly is:
mount -o remount,ro /
At this point you can run fsck.
I generally run fsck on a single partition at a time in this mode, but
you can also run multiples.
Probably the simplest way to fix the MBR is to go to YaST/System/Boot
Loader. Stepping through this, should cause the MBR to be rebuilt.
Another way is to use the grub(8) command. Check the grub info page:
info grub
There is a section "3.2 Installing GRUB natively"
This will also rewrite the MBR.
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- References:
- Re: [opensuse] RE: Damaged Master Boot Record
- From: Jim Flanagan
- Re: [opensuse] RE: Damaged Master Boot Record
- From: Registration Account
- Re: [opensuse] RE: Damaged Master Boot Record
- From: Jerry Feldman
- Re: [opensuse] RE: Damaged Master Boot Record
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