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Installation corrupted UEFI part of the disk

asked 2013-08-17 02:06:12 -0500

bobansk gravatar image

updated 2013-08-17 04:26:16 -0500

FranciscoD_ gravatar image


I have installed fedora on a dual boot with windows 8 and after the installation i can only boot into fedora in legacy mode and not into UEFI Windows. Is it possible that during installation I somehow have corrupted the GPT partition table?

Its not even possible to choose windows recovery from the UEFI Menu or to browse the efi system partition. My computer only sees the legacy part of the disk with fedora on it. How can I revert it?

Thanks. Bobansk.

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answered 2013-08-17 21:18:06 -0500

faustus gravatar image

Did you install Fedora in UEFI mode? Fedora installation and live CD or DVDs can be booted either in legacy mode or in UEFI mode (on hardware that supports it). If you boot the Fedora media in legacy mode then it will install that way, and the GRUB menu will not be UEFI aware, so no easy dual-boot with Windows. To test this, when you are running your Fedora installation, see if there is anything listed as follows:

ls /sys/firmware/efi/vars/

If there are entries in that directory, then you are running Fedora in EFI mode; if not, then your don't have a UEFI Fedora installation.

From Fedora running in UEFI mode (either your installed system as confirmed above, or a Live DVD booted explicitly in UEFI mode) you can use the "efibootmgr" command to add/remove entries from the computer's UEFI menu.

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Asked: 2013-08-17 02:06:12 -0500

Seen: 374 times

Last updated: Aug 17 '13