How to restore Windows 8.1?

Question

Iron

Hello. I need help. I put next to Windows 8.1 Centos7. installed fine. now there is no wine. I'm trying to return the bootloader to the menu. To do this, I enter in the command

sudo vim /boot/grub2/grub.cfg

menuentry "Windows 8" {
  set root='(hd0, 2)'
  chainloader +1
}

The problem is that I don't know what numbers to put in (hd0, 2).
how to find out?
after reboot in the boot menu when I click on windows 8.1. Writes that the disk hd0, 2 is not found. how to fix this?

Answer 1

Oh my god, already Linux on YouTube.
Do update-grub as root.