Recently I had a problem with my Windows Installation on the second disk which writes its own MBR in the disk. I had reinstalled Windows and several applications but after one day of work and one of those reboots the computer only reponded with the message “no disk found” or similar. I checked with the other disk containing the linux system, but the harddisk was there and all files seemed to be ok. So somehow the mbr was damaged by – what ever. It could be fixed with the command fixmbr from the Windows Recovery System (booted with the installation cd) To habe the MBR backuped I found the following solution using dd.
dd if =/dev/hda count=1 bs=512 of=/Imagename
Other uses of dd are to delete the MBR
dd if=/dev/zero of=/dev/hda1 bs=1 count=446 conv=notrunc
Backup a Partition
dd if=/dev/hda1 | bzip2 >/home/backup/hda1.img
Restore the Partition
bzip2 -dc /home/backup/hda1.img >/dev/hda1