[CentOS] installer and os-prober not finding Windows XP installation

[Ljubomir Ljubojevic]

On 07/19/2014 11:24 PM, Eric Smith wrote:
> I installed CentOS 7 on a Shuttle X27D box (dual-core Atom 330), and
> so far it seems to work fine, but it didn't set up a Grub2 entry for
> the existing Windows XP installation in the first partition (MBR).
> Running os-prober generates no output.
> 
> fdisk shows that the NTFS partition is still present as /dev/sda1, and
> still has the bootable flag set.
> 
> I added a menuentry for Windows to the end of /etc/grub.d/40_custom:
> 
> menuentry "Windows" {
> set root=(hd0,1)
> chainloader +1
> }
> 
> and ran:
> 
> grub2-mkconfig >/boot/grub2/grub.cfg
> 
> and that lets me boot Windows, but I thought this was supposed to be
> taken care of automatically.  Is there any known problem that prevents
> the installer or Grub2 from finding Windows XP?
> 
> I don't normally set up dual-boot on production machines, but I use it
> a lot for testing.
> 

It does not see Windows 7 either.

Note that Windows 7 to boot might need :

menuentry "Windows 7" {
insmod ntfs
search --set=root --label WINDOWS_7 --hint hd0,msdos1
 ntldr /bootmgr
 }

and that msdos1 parametar in GRUB2 does not start with 0 but with 1?
(Check this)

-- 
Ljubomir Ljubojevic
(Love is in the Air)
PL Computers
Serbia, Europe

StarOS, Mikrotik and CentOS/RHEL/Linux consultant