Story: I had Windows on one partition, and an unallocated partition. I then installed CentOS 7 on the unallocated partition. (I selected the option for the installer to automatically create the partitions for the unallocated portions of my disk.) However, GRUB failed to create a menu option for booting into Windows, which is causing me great distress.
According to http://www.tuxradar.com/answers/113:
I should first issue the rootnoverify command. But when I do, bash says:
bash: rootnoverify: command not found...
I believe GRUB2 has been installed already because I have the file /boot/grub2/grub.cfg.
Question: 1. Why is rootnoverify not found? 2. Why didn't the CentOS installer add an entry for Windows?