Citation :
First, we will save the MBR with DD (GNU convert and copy)
* cd /root
* mkdir partition-backup
* cd partition-backup
* dd if=/dev/hda of=backup-hda.mbr count=1 bs=512
It will produce a very small, but very important file: 512 bytes of data. Now, we will save entries of the extended partitions:
* sfdisk -d /dev/hda > backup-hda.sf
sfdisk is a tool provided with the util-linux package.
IMPORTANT! You should now put these files somewhere safe - copy them to a floppy disk (and take a copy of it!), or burn them onto a CD. Keep these files safe. Do not leave them on your hard drive - if there is a problem with th drive, you may not be able to access these files, and while your partition images won't be wortheless, it will certainly be a lot harder to restore your data.
Restoring partition entries from the backup
Be careful, restoring is a dangerous action - it can destroy data! First, we will restore the Master Boot Record:
* dd if=backup-hda.mbr of=/dev/hda
Then, here is how to restore extended partitions entries:
* sfdisk /dev/hda < backup-hda.sf
To finish, you will have to reboot your computer.
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