HowTo Recreate Grub Install And The Master Boot Record (MBR) If Corrupted
From NST Wiki
Jump to navigationJump to search- 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 and/or MBR install on the hard disk. Use this HowTo to help recreate the grub and MBR to help resolve this issue.
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 ~]#