Difference between revisions of "HowTo Recreate Grub Install And The Master Boot Record (MBR) If Corrupted"

From NST Wiki
Jump to navigationJump to search
Line 1: Line 1:
This '''HowTo''' shows the steps one can used to recreate a corrupt "'''[http://en.wikipedia.org/wiki/GNU_GRUB grub]'''" boot loader and/or '''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 that the "'''/dev/sda1'''" partition is used for grub and the '''MBR''' is on "'''/dev/sda'''".   
+
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 that 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'''".   
  
 
* '''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 18:49, 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 that partition: "/dev/sda1" is used for "grub" and the MBR is on "/dev/sda".

  • 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 ~]#