19/09/2013
My new goal is to recover the broken link in my secondary HDD to restablish a system.
First step:
to find out how is recognized my secondary HDD
Trying with fdisk
Output
fdisk /dev/sda
fdisk /dev/sdb

Recognizes both and also shows us UUID and GB

I know that my secondary HDD is /dev/sda

Now I have to find out how to make a custom entry in GRUB2

I have reviewd the information in help.ubuntu.com ... GRUB2
and now I know that I have to do the custom entry in /etc/grub.d/40customentry...

Now I only have to
set-root= use the proper UUID that I found in fdisk /dev/sda
linux /boot/grub/... find my vmlinuz
initrd /boot/grub/... find my initrd

and cross my fingers