View Full Version : GRUB does not show Windows any ideas?

April 9th, 2015, 04:59 AM
Hey guys, hope you're doing well...

I've got a problem with GRUB, I'm using Intelís raid software and got a 256GB/256GB raid disk with windows 8.1 installed, got a new M.2 drive with Ubuntu, the problem is GRUB creates a menu without Windows and I tried solving it using boot-repair but that does'nt change a thing. (The system also has a 1TB drive for storage)

The GRUB menu is always:
Ubuntu - other options (something similar)
EFI firmware (something similar)
System Setup (which just takes me to BIOS settings)

I also have the Boot info summary from the boot-repair http://paste.ubuntu.com/10779162/

Thanks ;)

April 9th, 2015, 04:15 PM
I do not know RAID.

But it seems that Boot-Repair tried to add RAID drivers, but you do not seem to show efi partition for Windows.
Is Windows installed in UEFI boot mode or CSM boot mode.
CSM - UEFI Compatibility Support Module (CSM), which emulates a BIOS mode

For grub to dual boot you have to install the RAID drivers, which normally are not in a Desktop install, Windows must be in UEFI boot mode, and fast startup or always on hibernation must be off in Windows.

UEFI and CSM/BIOS are not compatible, you have to totally reboot to switch modes, or you can only use grub to boot other installs in the same boot mode.

April 9th, 2015, 07:09 PM
I turned off fast startup in windows and tried it again, however I got the same problem.
I have CSM disabled in my BIOS for windows

Do you think I need the RAID drivers in the Ubuntu installation?

April 9th, 2015, 08:22 PM
Linux will not see the Windows without whatever RAID drivers are needed for your type of RAID.

I thought Boot-Repair added the RAID drivers for its use, but seemed to have issues seeing the RAID partitions.


I do not think this includes any info on UEFI versions:

parted (3.0) completely removes filesystem creation and modification support, except for filesystem probing to determine what's in a partition.
User who installed fakeRAID
How to install Ubuntu 14.04 in software RAID 1 with Intel Z87 chipset mobo controller

April 10th, 2015, 12:58 PM
So I had a go with this again however I noticed that when running boot repair, I get the windows partition in the launcher and if I try to click on it I get this error:
so I guess for some reason the system is always on, although fast startup is turned off o.O

Thanks for the help oldfred!

Edit: At the moment I get to switch between the two OS's via the BIOS where i can select which drive to boot from which I guess i can live with