Things like sda and sdb are Linux. Your bios is at a lower level, ie in onboard flash rom. It's primary purpose is to act as a bootstrap loader for a disk operating system such as ms-dos or linux. The standard on a modern system is a scheme called efi.
That said, you appear to have 3 physical hdds. If you are on a desktop system drive numbering is determined by which ribbon cable is plugged in. The boot disk will be at position 0 on the primary cable. It is likely the first drive on your list. Then you can boot from the hd and use linux tools. If you are so inclined, you can disconnect the other drives temporarily in order to add them one at a time and see what you have.
Incidentally, you always have the option of booting linux and installing disk tools for 1 session from usb stick.
Sent from my T-Mobile 4G LTE Device
-------- Original message --------
From: Michael Schwendt <email@example.com>
Date: 11/22/2015 8:47 AM (GMT-05:00)
Subject: Re: installing grub back to MBR
On Sat, 21 Nov 2015 12:18:19 +0200, Angelo Moreschini wrote:
> thank you for your answer..
> I have problem with the identification of the hard drive that has the MBR .
> In the screen that the BIOS show me, I see three HD:
> - ST 3500418AS
> - WDC WD10EZEX 60Z
> - WDC WD50000AZRX-0
> *(I have to select one of those )*
> This information say me nothing about what is the HD with MBR..
Odd. When you add a harddisk to your system, you can retrieve information
about it either before partitioning it or afterwards, too. If not via
kernel messages, run command-line tools such as hdparm or smartctl. They
print details. You may need to install missing packages for these tools.
hdparm -i /dev/sda
smartctl -i /dev/sda
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