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How do I make Grub to detect my old OS?

asked 2015-07-13 10:20:45 -0500

Senibelan gravatar image

updated 2015-07-14 18:33:08 -0500

mether gravatar image

So I was using windows 8.1 and I decided to install Fedora 22. I was careful while selecting the partition and now Fedora is installed, I can see my windows old files in the file explorer which means Windows is here. Now whenever I boot my system the Grub screen appears but there is no windows 8.1. I don't know what to do to have acess to windows again.

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Search this website for grub windows. Type it in the search field and don't hit ENTER but select from the questions that appear in the list preview.

Looks like a few people already had this issue and it has been resolved.

Start reading this one here, and also post the output of fdisk -l.

This one can also be quite helpful.

florian gravatar imageflorian ( 2015-07-13 11:41:35 -0500 )edit

Go to Linux and post output of fdisk -l. Thanks. Check for an 'EFI system':

...
Disk identifier: D7F9AFA6-F54C-48DF-B986-F2D279A78FE1

Device          Start        End    Sectors  Size Type
/dev/sda1        2048    2050047    2048000 1000M Windows recovery environment
/dev/sda2     2050048    2582527     532480  260M EFI System
...

Please also post your grub.cfg (/boot/efi/EFI/fedora/grub.cfg).

hello gravatar imagehello ( 2015-07-14 03:52:29 -0500 )edit

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answered 2015-07-13 14:49:02 -0500

Take a look to sudo os-prober which updates the grub2 menu.

Then sudo grub2-mkconfig -o /boot/grub2/grub.cfg to update the grub2 configuration.

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OS Prober should have detected Windows while installing; I don't think that's the issue, but you can still try it. :D

hello gravatar imagehello ( 2015-07-14 03:52:00 -0500 )edit
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answered 2018-07-12 07:00:42 -0500

Thanks for your answers. It worked!

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answered 2018-07-12 07:16:42 -0500

Try to deactivate 'grub' and load Windows, check if files to star windows still there. Prepare another divice, like cd-rom, usb stick, others.. 'dd of=/dev/sda? if=/def/sdWindowsStick'. Reinstall grub 'grub2-install -options'. Another method if had UUIDs, locate id-s and check over '/etc/fstab'.

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Asked: 2015-07-13 10:20:45 -0500

Seen: 1,021 times

Last updated: Jul 12