Arch Linux

gallu

Member

Registered: 2016-08-22

Posts: 2

Grub dual boot with Windows

OS prober does not helps. This is output of fdisk -l:
   

    Device          Start        End    Sectors  Size Type
    /dev/sda1        2048 1646321663 1646319616  785G Microsoft basic data
    /dev/sda2  1646323712 1646356479      32768   16M Microsoft reserved
    /dev/sda3  1646356480 1748723711  102367232 48.8G Microsoft basic data
    /dev/sda4  1748723712 1765500927   16777216    8G Linux swap
    /dev/sda5  1765500928 1828415487   62914560   30G Linux filesystem
    /dev/sda6  1828415488 1953525134  125109647 59.7G Linux filesystem
    
    Device       Start       End   Sectors   Size Type
    /dev/sdb1     2048    923647    921600   450M BIOS boot
    /dev/sdb2   923648   1128447    204800   100M EFI System
    /dev/sdb3  1128448   1161215     32768    16M Microsoft reserved
    /dev/sdb4  1161216 250068991 248907776 118.7G Microsoft basic data

I have installed Arch linux on sda and Windows 10 on sdb. I tried to manually add path to my grub.cfg file like this:

    menuentry 'Windows 10' {
    set root='(hd1,msdos1)'
    chainloader +1
    }

Then I run

# grub-mkconfig -o /boot/grub/grub.cfg

But after opening this in grub I recive only "No such partition" error.
How should this entry looks like in my case?

alex.theoto

Member

From: Athens Greece

Registered: 2014-11-30

Posts: 307

Re: Grub dual boot with Windows

If your system is BIOS, try to install os-prober and then

grub-mkconfig -o /boot/grub/grub.cfg

If you have UEFI maybe there is another way...

gallu

Member

Registered: 2016-08-22

Posts: 2

Re: Grub dual boot with Windows

My first sentence - os prober does not help. I tried with rEFInd, but this is ugly as hell.
I want to make it working with grub. Is there any way to do it?

piratebill

Member

From: Sol System

Registered: 2011-10-20

Posts: 133

Re: Grub dual boot with Windows

I just solved the same issue this weekend. I'm assuming you installed the older bios version of grub? something like

grub-install /dev/sda...

If so, it looks like your windows drive is using EFI. This grub mode cannot read EFI (hence os-prober failing). I reinstalled grub with UEFI and it picked it up no problem.

See here for how to install grub the UEFI way. Note: you will need to repartition your drive (needs a 512M partition)

Last edited by piratebill (2016-08-22 19:40:45)