Backing Up and Restoring Your Boot Sector
@mindaiict
·
10.9.08
When GRUB runs, the boot sector part of your hard disk contains information about which OS you can boot. This sector sometimes gets corrupted due to a system crash or power loss and your computer won't boot. Luckily, with a few carefully chosen commands, you can back up and restore this important sector.
Back it up using this command:
foo@bar:~$ sudo dd if=/dev/hda of=MBR-backup bs=512 count=1
The dd command copies the sector from the first disk (/dev/hda-change this to your disk) and saves it as MBR-backup in the current directory.
When you boot your computer in rescue mode, you can use these command to manage your boot sector.
Back it up using this command:
foo@bar:~$ sudo dd if=/dev/hda of=MBR-backup bs=512 count=1
The dd command copies the sector from the first disk (/dev/hda-change this to your disk) and saves it as MBR-backup in the current directory.
Quick Tip
When referring to boot sectors you may see it prefixed as MBR-this is short for master boot record.
To restore the sector, run this command:
foo@bar:~$ sudo dd if=MBR-backup of=/dev/hda bs=512 count=1
To restore the sector, run this command:
foo@bar:~$ sudo dd if=MBR-backup of=/dev/hda bs=512 count=1
When you boot your computer in rescue mode, you can use these command to manage your boot sector.
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