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. | + | 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 ~]#