I've repurposed a desktop machine to create a Linux development workstation. I left the original Windows 7 disk in it as hdc, and installed two new 1.5 TB disks for the system (sdb) and a /projects mount (sda).

After installing openSUSE 13.2, and using GRUB2 as the loader, I'm able to boot SUSE without any drama, but am no longer able to access Windows, as it doesn't show up in the GRUB2 menu. Using fdisk -l verifies that the Windows disk is present as sdc:

Device Boot Start End Sectors Size Id Type
/dev/sdc1 * 2048 206847 204800 100M 7 HPFS/NTFS/exFAT
/dev/sdc2 206848 1953521663 1953314816 931.4G 7 HPFS/NTFS/exFAT

however, os-prober doesn't find it:

No volume groups found
/dev/sdb3penSUSE 13.2 (x86_64):SUSE:linux

This explains why none of my efforts to update GRUB2 has worked. Does anyone know why os-prober wouldn't see the Windows OS?

Thanks for any help with this,

Jerry

Windows expects to be on drive C:, the automatic default booted disk. Try making it sda, and moving the others around.

If you're sure that isn't the problem, google for windows <version> rescue disk. Guys make these up and they are 32 or 64 bit, and use files expected to be on your windows install. They can usually fix boot issues, vista rebooting, and so forth.

From the GNU documentation for GRUB2:
http://www.gnu.org/software/grub/man...OS_002fWindows

Thanks to both of you for your quick answers. Since I didn't know what side-effects diskmap might have, I decided to change the Windows disk to sda. That was easy, just requiring a data cable swap. However, it didn't solve the problem. My primary issue at this time is not getting Windows to boot, but getting it to simply show up in the GRUB2 menu.

fdisk -l now reports:

Device Boot Start End Sectors Size Id Type
/dev/sda1 * 2048 206847 204800 100M 7 HPFS/NTFS/exFAT
/dev/sda2 206848 1953521663 1953314816 931.4G 7 HPFS/NTFS/exFAT

but os-prober still tells me:

No volume groups found
/dev/sdb3penSUSE 13.2 (x86_64):SUSE:linux

I created the 15_Windows script like this:

#! /bin/sh -e
echo "Adding Windows" >&2
cat << EOF
menuentry "Windows" {
set root=(hd0,1)
chainloader +1
}
EOF

and I've verified that it shows up in grub2.cnf like so:

### BEGIN /etc/grub.d/15_Windows ###
menuentry "Windows" {
set root=(hd0,1)
chainloader +1
}
### END /etc/grub.d/15_Windows ###

but still no joy in os-prober, so I'm not surprised that it doesn't show up in the GRUB2 menu.

Can anyone spot what I might have done wrong?

Thanks for any help,

Jerry

Try this in instead:
http://www.gnu.org/software/grub/man...in_002dloading

I think this should be in the main grub.cfg file but I don't use a bootloader so I may be wrong.