Difference between revisions of "HowTo Recreate Grub Install And The Master Boot Record (MBR) If Corrupted"
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− | This '''HowTo''' shows the steps one can used to recreate a corrupt '''[http://en.wikipedia.org/wiki/GNU_GRUB grub]''' boot loader install and/or '''[http://en.wikipedia.org/wiki/Master_boot_record MBR]''' on an '''NST''' system. Start by ''booting'' up "'''NST Live'''" ('''DVD''' or '''USB Flash Drive''') or '''NST''' on a "'''USB Flash Drive'''" hard disk install. This example assumes the corrupt '''[http://en.wikipedia.org/wiki/GNU_GRUB grub]''' and/or '''[http://en.wikipedia.org/wiki/Master_boot_record MBR]''' is on the disk associated with device name: "'''/dev/sda'''" were partition: "'''/dev/sda1'''" is used for '''[http://en.wikipedia.org/wiki/GNU_GRUB grub]''' and the '''[http://en.wikipedia.org/wiki/Master_boot_record MBR]''' is on "'''/dev/sda'''" sector 0. | + | This '''HowTo''' shows the steps one can used to recreate a corrupt '''[http://en.wikipedia.org/wiki/GNU_GRUB grub]''' boot loader install and/or '''[http://en.wikipedia.org/wiki/Master_boot_record MBR]''' on an '''NST''' system. Start by ''booting'' up "'''NST Live'''" ('''DVD''' or '''USB Flash Drive''') or '''NST''' on a "'''USB Flash Drive'''" hard disk install. This example assumes the corrupt '''[http://en.wikipedia.org/wiki/GNU_GRUB grub]''' install and/or '''[http://en.wikipedia.org/wiki/Master_boot_record MBR]''' is on the disk associated with device name: "'''/dev/sda'''" were partition: "'''/dev/sda1'''" is used for '''[http://en.wikipedia.org/wiki/GNU_GRUB grub]''' and the '''[http://en.wikipedia.org/wiki/Master_boot_record MBR]''' is on "'''/dev/sda'''" sector 0. |
* '''1)''' Make sure that there are no mounts using the "'''/boot'''" mount point: | * '''1)''' Make sure that there are no mounts using the "'''/boot'''" mount point: |
Revision as of 19:37, 25 October 2009
- Problem: When booting NST from a hard disk install and you see the message: "Disk Error" (or something similar) on the screen after POST.
- Solution: Typically, this is associated with a corrupt grub install and/or MBR on the hard disk. Use this HowTo to help recreate the grub install and MBR to help resolve this issue.
This HowTo shows the steps one can used to recreate a corrupt grub boot loader install and/or MBR on an NST system. Start by booting up "NST Live" (DVD or USB Flash Drive) or NST on a "USB Flash Drive" hard disk install. This example assumes the corrupt grub install and/or MBR is on the disk associated with device name: "/dev/sda" were partition: "/dev/sda1" is used for grub and the MBR is on "/dev/sda" sector 0.
- 1) Make sure that there are no mounts using the "/boot" mount point:
[root@probe ~]# df
Filesystem 1K-blocks Used Available Use% Mounted on /dev/mapper/vg_probe-lv_root 235338552 4335136 228613664 2% / /dev/sdb1 198337 22358 165739 12% /boot tmpfs 1419416 0 1419416 0% /dev/shm [root@probe ~]#
- 2) Unmount "/boot" if currently mounted:
[root@probe ~]# umount -v /boot
/dev/sdb1 umounted [root@probe ~]#