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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Getting Dual-boot to work on (non?) UEFI system.

This is the first time I'm working on a Laptop with UEFI so bear with me. I'm gonna bullet-point this to make it quick: HP Envy 6 Windows 7 Preinstalled Default BIOS setting: Legacy Support - ...
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25 views

Cannot boot onto any OS after deleting Linux partition on UEFI system

Today, I decided to delete Ubuntu 14.10 from my computer. Everything was OK, I had created the USB recovery drive of Windows 8.1. After formating the Linux, I restarted. Sadly, I forgot to delete the ...
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38 views

Cannot access BIOS after installing a Linux distro

Some time ago, I went and installed ElementaryOS on my Samsung NP530U3C. After that, I could never access the BIOS again. Pressing F2 had absolutely no effect (neither any other common BIOS-accessing ...
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1answer
47 views

replace efi firmware with old legacy bios?

So I bought a new laptop with 64-bit windows 8 pre-installed, and in preparation for downgrading to win7 32-bit, i've been reading about EFI and MBR etc.. It seems like the firmware which boots disks ...
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29 views

Changed laptop BIOS boot settings - Black screen

Laptop concerned is an Acer TravelMate P453-M. Already asked the question on Acer forums, but maybe you guys can add more insight! I recently had a motherboard and HDD replacement on the laptop. I ...
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1answer
57 views

How do I convert an EFI System Partition into a normal GPT partition?

I had a Windows 8.1 that required a re-install. In the process, my 4TB secondary disk is now showing up in Disk Management as an EFI System Partition, with no volume. In DISKPART, a volume is shown, ...
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21 views

Go2Bios utility not proper working when trying to acces into bios

i have this motherboard, msi h97 gaming 3, now msi have go2bios an utility which gives the access to bios during a windows session. In a fairy way the system reboot into the bios, but when i click on ...
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40 views

Unable to switch from UEFI to Legacy mode or disable secure boot

Disregard - Problem Solved I'll leave this up in case it's relevant to anyone else, but I found the very simple thing I'd overlooked in my case. After disabling secure boot (or changing to legacy, ...
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5answers
201 views

Secondary Internal HDD Vanishes/Reappears Randomly In Windows 8.1

To clarify, I'm referring to entire disks disappearing, not just partitions. The PC in question is an HP Pavilion 2325DX. Both drives are variants of HGST. One is in the primary slot, the other is in ...
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2answers
82 views

Asus A53E Laptop in UEFI mode resets BIOS three times before booting

Working with an Asus A53E laptop. Enabled UEFI boot mode in the BIOS and installed Windows 8.1 x64 successfully last night. Now, today, when I start up the machine from cold boot, I can clearly hear ...
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49 views

How can I place /boot/efi on a different drive than / and /home?

I am trying to install Fedora 21 onto a relatively recent Toshiba laptop. Due to firmware problems, I cannot alter the existing EFI partition. Therefore, I need to install /boot/efi on external media. ...
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36 views

Windows 8.1 - doesn't allow me to boot into firmware settings

I have Windows 8.1 which is booted for sure in UEFI mode because of some reasons I'm booting with UEFI Gop and my inital windows resolutions is Full HD. This image: My BCD configuration: ...
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63 views

Restore hardware entries in UEFI from Windows 8.1

After a missuse of efibootmgr under Centos 7, I have deleted every boot entries in UEFI, including USB, CD-ROM, DVD. So I couldn't boot anything. I recovered Windows with the recoverer partition, but ...
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1answer
61 views

How to add UEFI image boot option in BCDedit?

I just installed FreeBSD on a GPT partition. On which is also installed Windows 8.1 and it's EFI partition with Windows Boot Manager. The FreeBSD installer auto-added another EFI partition with it's ...
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0answers
103 views

No bootable device found on new UEFI installation

I have just installed Fedora 21 on a new laptop I bought using the following partition scheme: GPT partition table +-------+-----------+------+------+------+-------+ | sda1 | sda2 | sda3 | ...
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87 views

Multiboot by UEFI boot manager for Win8.1, Mac OS X and Linux

I am trying to build a hackintosh and want to multi-boot 1) Windows 8 2) Mac OS X and 3) Linux. Each OS will be installed on their own harddisk. If the motherboard and display card are fully ...
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1answer
52 views

What is CSM option

What is the CSM option in BIOS? If I can't boot into Windows any more, is it because CSM is disabled? Would an ASUS K55 come with this option diabled?
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1answer
108 views

Install Windows 7 after Ubuntu: Cannot install because of GPT partition

I'm trying to install Windows 7 on a NTFS partition after installing Ubuntu 14.04. But it says that I'm using a GPT partition. The solution I found was to erase everything, then install Windows 7 then ...
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193 views

USB HDD disk not recognized in BIOS Boot order

I installed Ubuntu 14.10 along with Windows 8.1. Obviously I used a USB drive to install Ubuntu. I made all changes to UEFI so I could boot from USB. I could see the USB in the Boot Menu and was able ...
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0answers
77 views

Modify UEFI Windows Boot Loader

I have installed 2 systems on my ultrabook Asus UX32VD. I use Windows 8.1 x64 - on first SSD disk and Kali Linux (security distribution based on Debian) - on second SSD disk. I have fully encrypted ...
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1answer
37 views

UEFI strange behavior

Hi have a toshiba Satellite L50-A1-D6, with the latest (14/11/2014) bios update. I have removed windows8, completely formatted the HD ( in GPT ) and installed Linux (Ubuntu but this is not really ...
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115 views

Boot from CD using UEFI instead of BIOS

I have a Lenovo IdeaPad Y510P. This is my last attempt at recovering my computer, as my recovery partitions are gone and I cannot boot into my computer otherwise. I have Windows 8 x64 OEM installed. I ...
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14 views

samsung-laptop module in UEFI [closed]

After searching the internet I found no good answer to this. I know that the samsung-laptop module is automatically blacklisted when a linux installation is done in UEFI mode. This was a measure to ...
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2answers
327 views

Possible to install 64-bit Windows on 32-bit UEFI?

I recently purchased an HP Stream 7, which I was led to believe would have Windows 8.1 64-bit installed. However, it has 32-bit Windows, even though it has a 64-bit processor. Installing 64-bit has ...
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1answer
85 views

Why is the CPU frequency always very high on my system?

I have a Windows 7 Pro x64 system used as a home server. Hardware: Core i5, 4670K (3.4 GHz) on an ASRock Z87E-ITX with the latest UEFI firmware. I've discovered today that the CPU frequency is too ...
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109 views

Fedora 21 64bit DVD only recognized as BIOS not UEFI

How do I get my motherboard to recognize the UEFI option of the Fedora 21 install DVD? Per the docs, I need to boot to the UEFI option to install Fedora as UEFI. There is no separate media for UEFI ...
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23 views

'Use a device' missing a USB option

I have a preinstall of Win 8.1 Dell XPS 15 MY2014 I am working on going to a dual boot with Ubuntu as my second. I am trying to boot from the uSB while in EFI mode. I have hit the shift button ...
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1answer
217 views

Bypass UEFI on native Windows 8 Acer Aspire V5

I'm working on an ACER Aspire V5-121 OEM Windows 8. The original hard drive with the OS was removed, and I have a blank one... but could not install any other OS on it, not even Win 8. As the V5-121 ...
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1answer
39 views

ASUS K75V UEFI Windows 8

I want install Windows 8 on my ASUS K75V with UEFI Boot, but I don't know why, but it is still installing with Legacy boot. How can I change this ? Thanks, very much. ehm... will be UEFI boot on ...
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1answer
73 views

After configuring UEFI to boot from CD I can no longer boot back in Windows 8.1

I have tried changing the settings back but I still cannot access Windows 8.1 It automatically opens a repair window (with a large unhappy face) which disappears after half a second. The system then ...
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22 views

How do I add a Boot Services Driver (BSD) to UEFI?

I have a UEFI system with a third-party PCIe SAS adapter. I also have the UEFI Boot Services Driver (BSD) for the third-party PCIe SAS adapter (EBC, platform agnostic). How do I add the Boot ...
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2answers
202 views

GParted leaves 1MB unallocated space at end of external HDD, override/alternative?

I only say external HD, I don’t have this issue with internal HDs. I created a GPT table, then made one NTFS volume. It shows 1MB unallocated at end of disk. I know it is a backup of the GPT table, ...
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31 views

Is BIOS/UEFI used after OS startup?

I know that BIOS/UEFI is used during computer startup to boot the system and check HW and that it provides abstraction over hardware Does this mean, that the OS kernel calls BIOS/UEFI layer when the ...
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39 views

What is the difference between boot manager and boot loader in windows ? Can you have multiple hard drives with different boot manager?

What is the difference between boot manager and boot loader in windows ? Can you have multiple hard drives in a computer with each drive with a different boot manager ? I recently put multiple hard ...
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61 views

Does each hard drive need EFI\ESP, MSR system partition if you want to install operating system(s) on each drive?

Suppose, there are at least 5 hard drives: drive1, drive2, drive3, drive4, drive5, .... We want to use first 3 drives to install 5 operating system: windows 8.1, windows 7, windows vista, windows xp, ...
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29 views

Reinstall Windows 8 efi boot partition

While installing Linux for a dual boot system, I messed up and mistakenly formatted the efi boot partition as plain FAT so that everything on it now is lost. How do I recover from this? I already ...
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625 views

“bootloop of death” in a samsung Phoenix securecore tiano (USB and Uefi and Bootscreen and Setup screen are off!)

Technically it is "almost" a bootloop, since I can boot ubuntu on the hard drive, and I could boot from the DVD (breaking ubuntu grub on the hard drive or trying to chainload to the dvd). Still, it ...
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52 views

Disabling PCIE_ASPM using UEFI without GRUB

I'm encountering issues with my wireless adapter (Intel AC7260) while running ElementaryOS Freya Beta 1. I've read that setting pcie_aspm=off has helped others before, and I would like to try this, ...
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1answer
98 views

Installing Windows 7 onto Laptop in UEFI

I want to install Windows 7 64-Bit onto my laptop's SSD, in UEFI. I have written a Windows 7 ISO onto a USB memory stick, using Rufus. This seems to have worked without errors. But when I try to boot ...
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1answer
56 views

Switching a VirtualBox Ubuntu Server VM from UEFI to BIOS

I have a virtual machine running in VirtualBox of Ubuntu Server 14.04.1 LTS x64. When I initially set it up, I configured the VM to use EFI instead of BIOS. But, it turns out VirtualBox's ...
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32 views

Can't boot Windows 8.1; Getting CRITICAL_SERVICE_FAILED [duplicate]

While booting my computer keeps showing the blue screen of death and the error message: CRITICAL_SERVICE_FAILED It reboots continually. I cannot get into the boot menu to try reinstalling ...
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66 views

Boot menu in Asus efi bios utility shows old boot entries

So I decided to reformat my computer today and I formatted my harddisk but when I went back into the bios/efi I found that it had entries to "Windows Boot Manager", "Linux Mint" and "grub". Even when ...
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35 views

Only one of my GPT drives is recognized by the BIOS

I have two GPT drives, an SSD and an HDD. My SSD has windows installed, my other HDD does not. My problem is that my BIOS only shows the SSD in boot options, and ignores the HDD. When the SSD is ...
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42 views

Why does UEFI BIOS only identify a 2TB drive on a 25TB virtual drive?

I configure a RAID6 using 16 2TB disks, and finally get a 25TB virtual drive as shown in LSI MegaRAID BIOS. And then I boot via a USB stick and try to install 64bit Ubuntu 14.04 on it. At the ...
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75 views

How can I fix GRUB on this dual disk setup?

I am dual-booting Windows and Ubuntu. The machine has two hard disks, both OSs are installed on sda (an SSD), but sda's bootloader uses UEFI and goes to Windows, whereas sdb has GRUB and boots to ...
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1answer
210 views

install windows 8 in GPT style hard disk

I have an Acer Aspire E15 laptop, of my friend, in which I have been trying to install Windows 8 but I am unable to do so. It has 4 partitions: Partition 1: total: 900MB - free: 900MB - type: Primary ...
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1answer
172 views

I'm unable to boot my Windows 10 installer USB in UEFI mode?

I'm having this problem with my Toshiba L875-S7308 where I cannot boot my USB while in UEFI mode. I have formatted the USB (tried MBR and GPT - same result), and restored the ISO using the Windows 7 ...
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2answers
54 views

Cannot boot win 8.1 without install cd

I've formatted my HP laptop and installed a new win 8.1 from dvd. But now I cannot boot from hard drive unless the install CD is presented. There's an error message displayed when booting in non ...
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100 views

Can restore Windows system image because of bios/efi issue

I have an "EFI" image of a windows 7 drive. The machine that it came off of uses linux now, but I have another machine, both Dell laptops, that can use this image. Both machines have UEFI, and I have ...
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2answers
120 views

Dual boot windows8.1 and ubuntu 14.04 launches ubuntu all the time

I have a little problem here where I followed all the steps to install ubuntu on a partitionned disk alongside windows8.1 everything went well except the fact that it always boots ubuntu. It might be ...