Re: restoring MBR
On Fri, 29 Jul 2011 19:04:42 +0000, Camaleón wrote:
> On Fri, 29 Jul 2011 13:28:48 +0200, Baurzhan Ismagulov wrote:
>
>> I've installed Squeeze to a USB drive, and grub2 installed itself to
>> the internal hard drive.
>
> And what OS does the internal hard drive have?
>
>> Now I can't boot from the internal drive since it has encryption
>> software checking some sort of CRC of the MBR.
>
> You should ask to the manufacturer/developer of that software/BIOS. But
> if it's a windows partition, "fixmbr" should just do it.
>
>> Is the backup of the MBR available somewhere in the Linux rootfs?
>
> Good question. It should.
>
> I remember it was available in openSUSE, look:
>
> stt008:/mnt/boot# ls -l
> total 9624
> -rw------- 1 root root 512 mar 1 2008 backup_mbr lrwxrwxrwx 1 root
> root 1 mar 1 2008 boot -> . -rw-r--r-- 1 root root 80417 ago
> 14 2009 config-2.6.22.19-0.4-default drwxr-xr-x 2 root root 440 ago
> 21 2009 grub lrwxrwxrwx 1 root root 28 ago 21 2009 initrd ->
> initrd-2.6.22.19-0.4-default -rw-r--r-- 1 root root 4147045 ago 21 2009
> initrd-2.6.22.19-0.4-default -rw-r--r-- 1 root root 395264 mar 1 2008
> message -rw-r--r-- 1 root root 100313 ago 14 2009
> symsets-2.6.22.19-0.4-default.tar.gz -rw-r--r-- 1 root root 400576 ago
> 14 2009 symtypes-2.6.22.19-0.4-default.gz -rw-r--r-- 1 root root
> 116297 ago 14 2009 symvers-2.6.22.19-0.4-default.gz -rw-r--r-- 1 root
> root 843747 ago 14 2009 System.map-2.6.22.19-0.4-default -rwxr-xr-x 1
> root root 2149420 ago 14 2009 vmlinux-2.6.22.19-0.4-default.gz
> lrwxrwxrwx 1 root root 29 ago 21 2009 vmlinuz ->
> vmlinuz-2.6.22.19-0.4-default -rw-r--r-- 1 root root 1596248 ago 14
> 2009 vmlinuz-2.6.22.19-0.4-default
>
> You noticed the first file (backup_mbr)? It is exactly what it seems but
> I cannot find such a file in Debian systems :-?
One of my (home made) overnight cron jobs does this:
dd if=/dev/sda \
of=$DST/mbr_backup.bin \
bs=512 \
count=1 >> $LOG 2>&1
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