dual boot - How do I add windows 7 on a new hard drive to grub

I have Ubuntu 14.04 installed on an SSS running perfectly. Got a new 2TB drive that has Windows 7 installed on it.

How do I add Windows 7 to my grub menu?

This is output of sudo update-grub:

Searching for GRUB installation directory ... 
found: /boot/grub Searching for default file ... 
found: /boot/grub/default Testing for an existing GRUB menu.lst file ... 

found: /boot/grub/menu.lst Searching for splash image ... 
none found, skipping ... 
Found kernel: /boot/vmlinuz-3.13.0-51-generic 
Found kernel: /boot/vmlinuz-3.13.0-49-generic Found kernel: /boot/vmlinuz-3.13.0-24-generic 
Found kernel: /boot/memtest86+.bin Updating /boot/grub/menu.lst ... done

This is the output of sudo os-prober:

sudo os-prober /dev/sdc1:Windows 7 (loader):Windows:chain