I have Windows 7 on a separate disk (sdb) as it came from the factory. To protect it I disconnected it while installing Ubuntu 14.04 on the sda disk. Then I connected the sdb drive and expected to see a choice in the boot menu for booting Windows 7. But it was not there. I'm pretty sure I followed the same procedure when I upgraded to 12.04 and it worked then. It looks like I have to modify grub to get it to see Windows 7 on sdb. Could you recommend a safe way to do this? Is there a tool that I can use? Thanks in advance...