The Unified Extensible Firmware Interface BIOS (UEFI) is a specification that defines a software interface between an operating system and platform firmware. UEFI is a replacement for the older BIOS firmware interface present in all IBM PC-compatible personal computers

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What does `sudo efibootmgr --gpt` do?

The manpage says: -g | --gpt Force disk with invalid PMBR to be treated as GPT But does this option make my computer treat all disks with invalid PMBRs as GPT, or only one, and how do I ...
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458 views

What can TianoCore's DUET be used for in a PC?

I've recently become interested in DUET, Intel's UEFI emulator for developers. I'm reading that it can be installed to a hard disk, but what does this make it? Some kind of boot monitor? A virtual ...
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157 views

Is it possible to flash UEFI(bios) from usb without entering UEFI shell?

The other day I decided to flash my ASUS g75vw laptop's UEFI(aka new bios) with a new version. Something went wrong and after restart I can only see black screen. I can say that the laptop starts, ...
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How do I recover my UEFI if it is corrupt?

Okay guys, I did something stupid. But first the back story. I installed Ubuntu 13.04 on my Win 8 Pre-loaded system as dual boot. At this point I could no longer boot Windows 8. I tried using ...
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2answers
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UEFI vs non-UEFI options in boot menu

I just built new PC based on Asus Z87-Plus motherboard and in BIOS boot menu I now have my removable devices listed twice - once as a device itself and once with "UEFI: " prefix. It looks like this ...
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390 views

Chainload EFI Bootloader from grub2 installed on MBR

When trying to chainload a EFI-bootloader from my grub2 I always get an Invalid signature error. According to this question, it happens because my grub2 is installed on an MBR-harddrive. The author of ...
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UEFI: Failed to install override security policy

I run the latest Arch Linux image on ASUS Sabertooth 990FX and get this error. Failed to install override security policy. How can i fix it?
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1answer
2k views

Boot ISO image from GRUB4DOS on EFI machines

I failed with loading ISO image (non-distro) from GRUB2 from USB stick, but found the way how I can boot the GRUB4DOS and then load the image from there. However, it doesn't work all the time and the ...
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3answers
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How to reinstall Windows Boot Manager on EFI partition

So I've been trying to install Ubuntu on a second HDD on my desktop, which has W8 installed on a SSD (UEFI-only boot). Thing is, during Ubuntu installation I made the mistake of choosing to install ...
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1answer
271 views

Asus N82J won't boot from DVD

I have a Asus N82J and I want to reinstall Win7. I have a DVD, which boots on other PCs as expected. The UEFI is set to boot from DVD, but it wont find any bootable media. I can not find an option ...
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3answers
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Unable to try or install ubuntu 12.04 and above 64 bit on my Sony Vaio which includes UEFI and Secure boot

First of all the hardware : Core i5 Ivy bridge 3210M 2.5Ghz 6Gb RAM AMD Radeon HD 7650M 750Gb HDD With Windows 8 Single language 64bit preinstalled. And include UEFI and Secure Boot Specific ...
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Recover Windows EFI Boot Manager after Grub install

I had Windows 8 installed, and tried to install Xubuntu in another HDD on my desktop. After installation, I could only boot into Xubuntu, and never got into the OS selection menu in GRUB. So I ran ...
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3answers
2k views

Do I need UEFI enabled in BIOS for a 4TB external, non-boot disk?

I just want to use a 4TB drive to store data. Do I need to do anything about UEFI in BIOS? When I Google, it always seems to be talking about boot disks larger than 2TB, so I am not sure if this is ...
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1answer
4k views

How to boot Windows 7 with UEFI, when Ubuntu is installed on Asus Zenbook Prime?

I've tried two days now to get ubuntu AND windows 7 to dual boot... What is the current status? I have completely removed win 8 and installed ubuntu 13.04 to the whole SSD. You may ask, why I have ...
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1answer
264 views

grml liveUSB does not appear as UEFI

I'm trying to repair my broken linux install with grml, since I hear it has EFI support, which I need for what I'm trying to do. Specifically, I need to see a 'UEFI:' prefix before my liveUSB drive ...
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2answers
2k views

Windows 8 deployment from USB

My goal is to deploy Windows 8 via USB to several computers. The systems I'm working with have come with GPT parted HD's. I have set up one the way I'd like it, sysprepped and captured the ...
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1answer
1k views

3TB hard disk displayed as 746GB

in BIOS , UEFI Boot is enabled , ACHI Mode is selected , and the 3TB Hard disk (Seagate ST30000DM001) is installed at SATA Port 3. However, in Windows 7 64-bit, 3TB hard disk is displayed as 746GB, ...
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2answers
1k views

Driveimage XML : unable to retrieve drive layout

DriveImage fails to execute "Drive to Drive" operation. Since the 1TB hard disk is dying, I decided to move the System Drive to newly bought HDD. It said, unable to retrieve drive layout. The source ...
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1answer
159 views

Can I patch the bugs in my laptop UEFI implementation?

I have an Asus X54H-SX137D laptop, with a K54L mainboard, which supports UEFI booting (AMI Aptio 4.5). I was using BIOS mode, and all functions were working well. In order to reap the benefits of a ...
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1answer
2k views

How to edit the Boot Graphics Resource Table / Edit windows 8 BOOT LOGO?

I want to edit the screen which is displayed when windows 8 (starts) loads (/loading). As for now it has the Toshiba logo, I want my custom logo or the windows default logo. I have found that UEFI ...
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2answers
683 views

Windows 7 fails to boot after cloning it into large drive (3 tb), with motherboard supporting UEFI

Situation: I had ASROCK P67 Pro 3 P2.0 motherboard with 1 tb disc drive with Windows 7 Home Premium x64. I just bought 3 tb disc (Seagate Barracude). I used Seagate disc tool to clone 1 tb into 3 tb ...
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1answer
598 views

Installing debian 7 besides windows 8

I bought a VAIO laptop which Windows 8 preinstalled on it in UEFI mode. Now I want to install Debian 7 besides Windows 8 but when I entered to the Partition Setup of debian setup menu, there is a ...
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1answer
2k views

Installing Ubuntu on a GPT partitioned drive

I have changed my system to boot from UEFI instead of BIOS and have installed Windows 7 on my internal SSD which has GPT partition type. I am trying to install Ubuntu 13.04 on my external HDD. My ...
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2answers
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How would I reinstall the grub-efi bootloader on Fedora Linux?

I recently installed Fedora 18 using EFI boot. Like the other current linux distributions, it sets up GRUB2 for me. I have experience with re-installing the BIOS version of GRUB when things go ...
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1answer
730 views

No display when discrete graphics card inserted

I recently purchased a new desktop PC: HP p7-1423w, i5-3330, HD Graphics 2500 (integrated). The first thing I did was remove Windows 8 and install Linux. A few days later, I was ready to install a ...
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1answer
2k views

Using the UEFI Shell to Restore Boot Configuration

I am using an embedded board that supports UEFI. It is a new fangled board and comes up with American Megatrends BIOS and a UEFI shell (I am more used to dealing with a bootloader and not a PC BIOS on ...
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1answer
1k views

Does the EFI boot partition need to be the first partition?

I'm trying to install kubuntu 13.04 and debian wheezy on my laptop with UEFI on. The installation goes fine but when I reboot it shows "no OS found". Could it be because I already have windows 8 on ...
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4answers
3k views

How to install UEFI BIOS?

I have bought Seagate Barracuda 3tb hard drive. When I start to install windows 8 x64 on that it tells me that Windows cannot be installed on this disk. The selected disk is of the GPT partition ...
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1answer
1k views

Migrating Windows 7 from MBR to EFI without formatting

Based on the experience documented in Migrate from MBR to UEFI with an encrypted system partition I'm considering the opportunity to migrate Windows 7 from the plain ol' MBR to the new GPT/UEFI boot ...
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1answer
859 views

Unable to boot Windows 7 “error while reading boot configuration data” and inability to restore

I have tried to install Windows 8 Pro over Windows 7 Ultimate, but the installation failed to install the new OS and even to restore the old one. I get the following error: File: ...
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2answers
5k views

UEFI Boot a NTFS Drive

I'm trying to install Windows 8 through a bootable USB flash drive, in UEFI Mode. However, while it does work when the drive is formatted as FAT for some versions of Windows 8, the version I want to ...
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3answers
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Every windows 8 boot breaks grub

I have Windows 8 and Ubuntu 13.04 dual booting with UEFI and grub. (re-used the windows UEFI partition) After I used boot-repair, everything seemed fine. After I boot into Windows, however, I can't ...
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1answer
595 views

Migrate from MBR to UEFI with an encrypted system partition

I had the idea of converting a live and running openSUSE installation from MBR to GPT/UEFI. I followed this tutorial and successfully converted disk keeping partitions and associated data. My original ...
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2answers
5k views

Does CentOS 6.4 Support UEFI and SECURE BOOT Fully?

Does Minimal Edition of CentOS 6.4 support UEFI & SECURE BOOT fully? I want to install it besides Windows 8. Now does it install normally or does it not support UEFI & SECURE BOOT fully yet? ...
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2answers
5k views

What are the disadvantages of not using UEFI boot?

I bought a Samsung series 9 laptop with 64-bit Windows 8 pre-installed and wish to install Linux (probably Ubuntu 13.04 when it comes out ext week, but also considering mint 14). Now there have been ...
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2answers
2k views

Installing Windows 7 on notebook with Windows 8 pre installed?

I have just acquired a Dell Inspiron 7720 with Windows 8 pre installed. I want to remove Windows 8 and install Windows 7 in it. Windows 8 is installed in the C: partition which is in GPT style. There ...
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1answer
2k views

Fix Windows 8 EFI Boot on 32-Bit images

I've been trying to install Windows 8 on a UEFI-based computer using a USB flash drive. As far as I've have been able to gather, there have been some issues with this kind of installation, as the DVD ...
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1answer
210 views

Installing Windows 8 from DVD (or USB) - Toshiba

I would like to do a clean install of Windows 8. I do not want to use the OEM stuff or do a Windows recovery. I have burned the ISO to a USB drive and when I boot, hit f12, and select USB I get ...
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2answers
787 views

How to boot in UEFI mode (Intel DP43TF)?

I have Intel DP43TF motherboard and the only option related to UEFI is "UEFI Boot" (Enable/Disable). Like on this screenshot I've found. But whether it is enabled or disabled, I can't see if it has ...
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1answer
2k views

Gigabyte UEFI DualBios Lingering Boot Option

I have a Gigabyte Z77X-D3H and a while back installed Ubuntu 12.10 on my system. Today I decided to switch back to Windows and formatted the disk for the new install. While I am not asked which ...
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0answers
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I used BCDEDIT to dual boot Windows 8 and ubuntu 12.10 [duplicate]

I used "bcdedit /set {bootmgr} path \EFI\ubuntu\grubx64.efi" following this link http://askubuntu.com/questions/235567/windows-8-removes-grub-as-default-boot-manager to dual boot linux, but now my ...
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2answers
7k views

How to restore UEFI on a Windows 8 preinstalled laptop

I will explain things as well as I can, but even after a bunch of reading, I am still not too up on UEFI. I generally deal with high level software. So I have a preinstalled Windows 8 system that ...
2
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3answers
1k views

Just installed Fedora 18 and computer is not booting

After some initial trouble, I was able to install Fedora 18, but Had to Disable Secure Boot, disable Fast Boot, and Enable CSM. Side Note: I was reading that by Enableing CSM I was not going to be ...
2
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0answers
405 views

Having problems with booting GRUB for EFI on USB stick

Whatever I do, it constantly drops me into the 'bash prompt'. Never displays a menu, nothing. I'm running GRUB on a USB stick formatted as msdos (so, FAT) and when I boot into it, GRUB simply won't ...
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3answers
1k views

Install Linux on 3TB HDD [closed]

How do i install Linux (e.g. Debian 6 or Ubuntu Server) on my server box with a single 3TB SATA HDD? Server is based on Intel D510MO motherboard. I can install the OS from the USB drive but i can't ...
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1answer
182 views

Install Windows 8 for second time failed

I've installed Windows 8 successfully and activated it. Then for some reasons it crashed with blue screen (I guess because of wrong VGA driver installed) Now I can't install the same OS from the same ...
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2answers
3k views

Windows 8 + UEFI BIOS, “UEFI Firmware Settings” Missing

Originally installed Windows 8 (non-UEFI install) with a GA-Z68MA-D2H-B3 motherboard. After upgrading the BIOS to a UEFI version and enabling some fast-boot settings and Windows 8 integration, the ...
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2answers
2k views

Can't install Windows 7 with UEFI off on GPT drive

I need to have a dual boot with Ubuntu and Windows 7 on my notebook with UEFI. I had to turn UEFI off to install and boot Ubuntu. Now I'm trying to install Windows 7, but it says it can't be ...
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2answers
131 views

Can WIndows 8 boot by BIOS?

I have not yet owned a computer with UEFI support. From unreliable source I heard that Windows 8 may boot by BIOS. However I conducted an experiment on a friend's PC, I turned UEFI off and Windows 8 ...
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2answers
275 views

How to prevent microsoft windows from running on a pc [closed]

Suggest I have a PC with either a BIOS with the commonly available options or a UEFI. Is there any way to change the settings so NO Windows NT based System will boot anymore (not even Windows PE ...