using GParted I can have a full information about all the HDs on the computer.. :
the first HD is ST3500418AS - this HD is not relevant for the grub problem because is used ony for datas storage (I know it - the label is : data_storing)
the second HD is  WDC WD10EZEX-60Z  ... and have two partitions
          sdb1 (FileSys.: ext4 - mount point : /boot - the flag is signed with "boot")
          sdb2 (FileSys.: lvm2 pv - mount point : /fedora - the flag is signed with "lvm")
third HD is  WDC WD5000AZRX-0  ... and have three partitions         
          sdc1 (FileSys.: nfts - mount point : nothing - the flag is signed with "boot")
sdc2 (FileSys.: extended - mount point : nothing - the flag is signed with "lba")
                  sdc5 (FileSys.: nfts - mount point : nothing - the flag is not reported)

At this point I think to know that there are two HDs bootable on the computer (because these have the "partition tables" activated):
      WDC WD5000AZRX-0  ----- partition sdb1
     WDC WD5000AZRX-0 ----- partition sdc1

But .. my acknowledge about Grub is no so very very good, and I would beg to be helped to understand as grub can work in a such situation.
This in order to concretely be able to solve this problem (that look to be no so much trivial...).

Thank you

On Mon, Nov 23, 2015 at 6:08 AM, Tim <ignored_mailbox@yahoo.com.au> wrote:
On Sun, 2015-11-22 at 17:00 -0500, sinthia.vee wrote:
> 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.

Only if you have cable select, and your BIOS hasn't been previously
configured to boot from something else.

That's an assumption that can lead you to play with the wrong drive.

> 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.

If you really can't tell which drive is which, this is the safest
option.  Afterwards, label your drives so you don't have to go down the
disassembly route, again.  Write onto the drive where you can see it
without disassembly (use white texta if the drive is black), enough
unique numbers from the drive's product code, or serial number, that
tally with what Linux reads using software.  So next time, you only have
to lift the lid.  You might want to label the outside of the box, too.

tim@localhost ~]$ uname -rsvp

Linux 3.19.8-100.fc20.i686 #1 SMP Tue May 12 17:42:35 UTC 2015 i686

All mail to my mailbox is automatically deleted, there is no point trying
to privately email me, I will only read messages posted to the public lists.

George Orwell's '1984' was supposed to be a warning against tyranny, not
a set of instructions for supposedly democratic governments.

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