ok... mi ero perso l'info.
La risposta la trovi qui:
http://www.dedoimedo.com/computers/dual-boot-windows-7-centos-7.htmlal punto
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Fix GRUB2
There are two ways you can resolve the issue. One, you can add a manual chainload entry to the 40_custom GRUB script under /etc/grub.d, and then update the GRUB2 menu using the following command:
grub2-mkconfig -o /boot/grub2/grub.cfg
The content you actually need to add to the 40_custom script BEFORE you update the menu is as follows:
menuentry "Windows 7" {
set root='(hd0,1)'
chainloader +1
} Fix GRUB2
There are two ways you can resolve the issue. One, you can add a manual chainload entry to the 40_custom GRUB script under /etc/grub.d, and then update the GRUB2 menu using the following command:
grub2-mkconfig -o /boot/grub2/grub.cfg
The content you actually need to add to the 40_custom script BEFORE you update the menu is as follows:
menuentry "Windows 7" {
set root='(hd0,1)'
chainloader +1
}
...