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Maxabout.com > Tips
Backing Up The MBRAdded on:8/31/2008 9:21:21 PM
In Linux Tips Rated by 1 users
- Just another note about restoring the boot loader for dual boot systems, after Windows messes it up. In Linux, the "dd" command can read and write to/from raw disks and files. If you have a floppy drive, creating a boot disk is as simple as putting a floppy in the drive and typing this:
$ su
<type password>
# dd if=/dev/hda of=/dev/fd0 bs=512 count=1
This makes an exact copy of the MBR of the first hard drive, copying it to a floppy disk. You can boot directly from this floppy, and see your old boot menu. You can restore it by switching the "if=" and "of=" (input file, output file) parameters.
- If you don't have a floppy drive, you can back it up to a file with this:
# dd if=/dev/hda of=/home/john/boot.mbr bs=512 count=1
- Then you can boot into a CD-ROM distribution such as Knoppix, or often use your Linux distribution's installation CD to boot into rescue mode, and restore it with:
$ su
# dd if=/mnt/hda5/john/boot.mbr of=/dev/hda bs=512 count=1
(you'll need to find and mount the partition containing the directory where you backed up the MBR for the "if" parameter-this is an example).
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