Arch Linux

teln0

Member

Registered: 2020-08-06

Posts: 8

Grub doesn't detect Windows 10 AND there is nothing like EFI/Microsoft

Hello everyone !

Here's my problem :
I recently installed arch but I need to use Windows for something. I've tried using grub-mkconfig (after mounting the Windows partition to /boot/efi), but there's still no Windows entry in the grub menu. I saw many posts talking about /EFI/Microsoft in the Windows partition, but I can't find anything like that in my partition, it looks like the normal root for Windows.

This may be related to the fact that I have 2 drives, one hdd, one ssd. When I installed windows on the ssd, I think (not sure) that it put it's boot partition one the hhd. The hhd is now broken and not accessible at all (but sometimes, randomly, it works for a bit, and I can boot into Windows).

Any advice on what to do ?
Thanks in advance !

DoodMann

Member

From: Philippines

Registered: 2020-08-04

Posts: 12

Re: Grub doesn't detect Windows 10 AND there is nothing like EFI/Microsoft

pacman -S os-prober, then update grub.

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certified noob with Arch-based distros, first time using Arch itself. 17 years old.

GeorgeJP

Member

From: Czech Republic

Registered: 2020-01-28

Posts: 190

Re: Grub doesn't detect Windows 10 AND there is nothing like EFI/Microsoft

... after mounting the Windows partition to /boot/efi) ...
... it looks like the normal root for Windows ...

Don't mount Windows partition to /boot !
You should mount EFI system partition to /boot

teln0

Member

Registered: 2020-08-06

Posts: 8

Re: Grub doesn't detect Windows 10 AND there is nothing like EFI/Microsoft

As I said, there is no EFI partition for Windows (it's on the brocken hard drive).

teln0

Member

Registered: 2020-08-06

Posts: 8

Re: Grub doesn't detect Windows 10 AND there is nothing like EFI/Microsoft

pacman -S os-prober, then update grub.

Tried that as well (that's not really where my problem comes from, see my other reply)

GeorgeJP

Member

From: Czech Republic

Registered: 2020-01-28

Posts: 190

Re: Grub doesn't detect Windows 10 AND there is nothing like EFI/Microsoft

As I said, there is no EFI partition for Windows (it's on the brocken hard drive).

... then have you EFI system partition on SSD created during Arch installation?
If so, it will not contain any info about Windows installation.

teln0

Member

Registered: 2020-08-06

Posts: 8

Re: Grub doesn't detect Windows 10 AND there is nothing like EFI/Microsoft

As I said, there is no EFI partition for Windows (it's on the brocken hard drive).

... then have you EFI system partition on SSD created during Arch installation?
If so, it will not contain any info about Windows installation.

Ok, but how do I fix that so I can boot into my Windows system ?

GeorgeJP

Member

From: Czech Republic

Registered: 2020-01-28

Posts: 190

Re: Grub doesn't detect Windows 10 AND there is nothing like EFI/Microsoft

We don't know, how you install archlinux and your drive/partition  configuration
Post output from lsblk -f

teln0

Member

Registered: 2020-08-06

Posts: 8

Re: Grub doesn't detect Windows 10 AND there is nothing like EFI/Microsoft

Will post that soon. (btw, it will be a picture of my screen, as the computer with the problem doesn't have internet on it).

loqs

Member

Registered: 2014-03-06

Posts: 19,048

Re: Grub doesn't detect Windows 10 AND there is nothing like EFI/Microsoft

It does not have internet access even using the Arch installation media?  If so how did you install Arch on it?

DoodMann

Member

From: Philippines

Registered: 2020-08-04

Posts: 12

Re: Grub doesn't detect Windows 10 AND there is nothing like EFI/Microsoft

What's your boot mode? If it's UEFI, It's impossible for a system to boot even Windows without an EFI partition. If it's Legacy, it's boot files are on the main disk. Tell us what boot mode you have.

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certified noob with Arch-based distros, first time using Arch itself. 17 years old.