GRUB doesn't detect Win7

zephyrthenoble · 2014-03-18 15:37:21

Hello,

I finally decided to start dual-booting Arch and Windows on an UEFI motherboard. I had previously had a dual-boot with Windows 7 and Crunchbang, and booted using GRUB. When I installed Arch, GRUB would no longer load.

I was going to reconfigure GRUB in Crunchbang, but since it wasn't working, I just removed Crunchbang, since I didn't want it anymore. I then installed GRUB using Arch and eventually got it to boot Arch. However, GRUB does not detect my Windows install.

Initially, GRUB was complaining, saying that the $LogFIle is not clean, mount in Windows. I mounted with ntfs-3g to clear the flag, and now nothing shows up when I run grub-mkconfig.

I have an SSD, which is where Windows was installed, and an HDD where I now have Arch and my Windows data.

I have turned off SecureBoot* and FastBoot.

I'm not sure what the issue is. If you want me to post any program output, I can.

Thanks

edit: after looking at my UEFI BIOS again I noticed that it says my Secure Boot state is Enabled, but I have the OS Type set to Other OS. There is no option to just change Secure Boot to Disabled.

edit2: I should also mention that I can mount and access all of my Windows files on my SSD and HDD, I just can't get GRUB to detect it.

Last edited by zephyrthenoble (2014-03-18 16:58:33)

Slithery · 2014-03-18 16:04:04

Do you have os-prober installed?

zephyrthenoble · 2014-03-18 16:39:28

Yes, I do.

clfarron4 · 2014-03-18 17:07:36

OK, so does running os-prober and then grub-mkconfig solve the problem, or not?

zephyrthenoble · 2014-03-18 17:26:15

No it does not. However, after further efforts, I can now see Windows when I run efibootmgr. It does not appear as an option after running grub-mkconfig, though.

scar · 2014-03-18 17:36:17

Well, I've had the same problem too, but a custom /etc/grub.d/40.custom file with a matching Windows entry solved that. It was the only way I've found.

https://wiki.archlinux.org/index.php/GR … menu_entry

zephyrthenoble · 2014-03-18 18:14:20

I am trying to follow these instructions but for some reason bootmgfw.efi doesn't exist

zephyrthenoble · 2014-03-18 18:44:15

I used my Windows 7 disk to restore Windows and add the boot manager back. When I run grub-mkconfig now, it shows up, but it doesn't show up on GRUB still.

scar · 2014-03-19 10:47:59

How exactly do you generate your grub.cfg with grub-mkconfig? Can you give us the full command you use for that?

hradecek · 2014-03-19 11:05:42

I had the same similar problem, so I added windows entry to grub.cfg manually.

zephyrthenoble · 2014-03-19 14:56:15

i have been using grub-mkconfig -o /boot/grub/grub.cfg. I have attempted to add windows using the /etc/grub.d/40_custom file, but nothing that I add shows up as an option for GRUB after rerunning grub-mkconfig. I added a command to reboot in the GRUB menu to test my 40_custom file and it didn't show up.

Also, just as an update, I am now able to select my Windows Boot Manager from the UEFI BIOS and boot to Windows.

scar · 2014-03-20 08:15:41

It looks your "grub-mkconfig" command target does not point to the right place.
If you use UEFI, you should point here:

 grub-mkconfig -o $esp/EFI/grub/grub.cfg

where $esp is your EFI System Partition.
(Don't forget to mount it at the right place before issuing the grub-mkconfig command)

Arch Linux

#1 2014-03-18 15:37:21

GRUB doesn't detect Win7

#2 2014-03-18 16:04:04

Re: GRUB doesn't detect Win7

#3 2014-03-18 16:39:28

Re: GRUB doesn't detect Win7

#4 2014-03-18 17:07:36

Re: GRUB doesn't detect Win7

#5 2014-03-18 17:26:15

Re: GRUB doesn't detect Win7

#6 2014-03-18 17:36:17

Re: GRUB doesn't detect Win7

#7 2014-03-18 18:14:20

Re: GRUB doesn't detect Win7

#8 2014-03-18 18:44:15

Re: GRUB doesn't detect Win7

#9 2014-03-19 10:47:59

Re: GRUB doesn't detect Win7

#10 2014-03-19 11:05:42

Re: GRUB doesn't detect Win7

#11 2014-03-19 14:56:15

Re: GRUB doesn't detect Win7

#12 2014-03-20 08:15:41

Re: GRUB doesn't detect Win7

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