[CentOS] installing C7 on a laptop with Win7, dual boot

Mon Mar 2 14:33:59 UTC 2015
Mário Barbosa <mario.barbosa at gmail.com>

On 03/02/2015 02:06 AM, Fred Smith wrote:
> Hi all!
> 
> I've just installed C7 on my netbook that already contained Win7 (and
> also Fedora 19, which the C7 is intended to replace). The Fedora installer
> had found the windows installation and it appeared in the grub menu,
> and was bootable and worked fine.
> 
> The C7 installer did not put the windows installation into the grub
> menu.
> 
> with some googling I found a page at https://priteshugrankar.wordpress.com/2014/09/12/dual-booting-centos-7-and-windows-7/ that gives a simple recipe for
> fixing this problem. basically:
> 
> cp /boot/grub2/grub.cfg orig.grub.cfg
> grub2-mkconfig -o /boot/grub2/grub.cfg
> 
> with (on his system) the second command above producing this output:
> 
> 	[root at localhost ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
> 	Generating grub configuration file ...
> 	Found linux image: /boot/vmlinuz-3.16.2-1.el7.elrepo.x86_64
> 	Found initrd image: /boot/initramfs-3.16.2-1.el7.elrepo.x86_64.img
> 	Found linux image: /boot/vmlinuz-3.10.0-123.el7.x86_64
> 	Found initrd image: /boot/initramfs-3.10.0-123.el7.x86_64.img
> 	Found linux image: /boot/vmlinuz-3.10.0-123.6.3.el7.x86_64
> 	Found initrd image: /boot/initramfs-3.10.0-123.6.3.el7.x86_64.img
> 	Found linux image: /boot/vmlinuz-0-rescue-327fe33f3b364802871211321a2790b7
> 	Found initrd image: /boot/initramfs-0-rescue-327fe33f3b364802871211321a2790b7.img
> 	Found Windows 7 (loader) on /dev/sda1
> 	Found Windows 7 (loader) on /dev/sda2
> 	done
> 
> Unfortunately, when I did it, I got this:
> 
> Generating grub configuration file ...
> Found linux image: /boot/vmlinuz-3.10.0-123.el7.x86_64
> Found initrd image: /boot/initramfs-3.10.0-123.el7.x86_64.img
> Found linux image: /boot/vmlinuz-3.10.0-123.20.1.el7.x86_64
> Found initrd image: /boot/initramfs-3.10.0-123.20.1.el7.x86_64.img
> Found linux image: /boot/vmlinuz-0-rescue-c875112952114f6284f69abaa4f9a2f7
> Found initrd image: /boot/initramfs-0-rescue-c875112952114f6284f69abaa4f9a2f7.img
> done
> 
> No mention of the windows installation.
> 
> It's not that I use the win7 installation much, but I do want to be able
> to do so when one of those rare occasions pops up.
> 
> Thanks in advance!
> 
> Fred


1) Install ntfs "support"
yum install -y epel-release
yum install -y ntfs-3g ntfsprogs

2) re-run the grub config gen script
grub2-mkconfig -o /boot/grub2/grub.cfg

Best,
Mário