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 and/or '''[http://en.wikipedia.org/wiki/Master_boot_record MBR]''' on an '''NST''' system. Start by <i>booting</i> up "'''NST Live'''" or '''NST''' on a "'''USB Flash Drive'''" hard disk install. This example assumes the corrupt '''[http://en.wikipedia.org/wiki/GNU_GRUB grub]''' and '''[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.   
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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 and/or '''[http://en.wikipedia.org/wiki/Master_boot_record MBR]''' on an '''NST''' system. Start by <i>booting</i> up "'''NST Live'''" 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.   
  
 
* '''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 18:55, 25 October 2009

This HowTo shows the steps one can used to recreate a corrupt grub boot loader and/or MBR on an NST system. Start by booting up "NST Live" or NST on a "USB Flash Drive" hard disk install. This example assumes the corrupt grub 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 ~]#