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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samsung-laptop module in UEFI

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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1answer
73 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
2k views

How to find out if UEFI is corrupt? If it is, how to recover it?

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 boot-repair, but it did not work. I have basically tried everything I ...
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2answers
6k views

Getting to BIOS on the Lenovo IdeaPad U530 Touch in order to install Arch Linux

I have a Lenovo IdeaPad U530 Touch with Windows 8 preinstalled. I tried to install Elementary OS, but discovered that the WiFi support wasn't there, so I decided to switch to Arch Linux. The problem ...
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1answer
54 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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1answer
3k views

Fedora 19 (you have not created a bootloader stage 1 target device)

I want to install fedora 19 to my HDD but I get errors: you have not created a bootloader stage 1 target device sda6 must have one of the following disklabel types: GPT. I tried: Create 1-2 mb ...
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20 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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11 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
48 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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3answers
42k views

How to tell if windows 7 installer boot in EFI or BIOS?

I have a windows 7 64bit installation USB. I want to know if the windows 7 installer has booted into EFI or BIOS mode. I googled and found a solution here ...
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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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1answer
17 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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9answers
215k views

How can I repair the Windows 8 EFI Bootloader?

I installed Windows 7 and Windows 8 in EFI mode on a hard disk some days ago. Today, the bootloader got missing/corrupted. I currently have the Windows 8 installer on a flash drive and tried using ...
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4answers
1k views

Linux on external drive / UEFI

I'm stuck on a problem : I want to make my external USB3 HDD self bootable. For now I must go through UEFI boot option. Explaination of my setup: I have a Win8 Asus Laptop with UEFI. I have ...
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1answer
357 views

Acer Aspire keeps rebooting when bootable USB inserted

So I have an Acer Aspire V5-131 and long story short (really, it's a long story!), I decided to do a complete wipe of the HDD (using dban). So right now the HDD is absolutely wiped, there's nothing on ...
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1answer
58 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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4answers
10k views

Hiren's Boot CD with UEFI support?

I am a long term user of Hiren's Boot CD, but the CD does not support booting on UEFI/EFI/SecureBoot hardware, is there some kind of update/patch to apply to the cd image to be able to boot without ...
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2answers
74 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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0answers
16 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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0answers
27 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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24 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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24 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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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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0answers
21 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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0answers
82 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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1answer
48 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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0answers
21 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
35 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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0answers
13 views

UEFI Bootloader for Legacy devices (without CSM)?

I have a couple tools that can only use legacy booting. Is there a UEFI-compatible bootloader that allows me to boot legacy OSes? I'm planning on creating a drive for recovery work that allows me to ...
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1answer
56 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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0answers
32 views

Harddrive only works in windows after booting in uefi setup

My secondary harddrive, that i use for file storage only, only works in Windows if i enter UEFI setup first. So if i want to access the drive, i have to boot in Windows, restart Windows holding shift, ...
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0answers
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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0answers
29 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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0answers
21 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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3answers
13k views

How do I install Windows 7 32-bit on a UEFI-based system?

I own Acer M5 recently and it comes with 64-bit Windows 8. I need it to run Windows 7 x86. I changed the BIOS setting to boot under Legacy BOOT instead of UEFI mode. I created my bootable USB using ...
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0answers
31 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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0answers
39 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
3k views

Lenovo Windows 8 EFI restore from image

First time here. I have bought e530 with windows 8 and the first hour of work with it i have a problem. I have ssd with windows 7 which i want to use with my new e530. I have made a sysprep of win 7 ...
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1answer
83 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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2answers
37 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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0answers
30 views

How to password protect USB UEFI boot on 8.1 w Secure Boot Disabled when Boot Order is USB-DVD-HD

I had to reverse my boot order to install dualboot Ubuntu 14.04 and have Secure Boot disabled. After the install I can (only) boot linux with rEFInd on DVD - which is fine for now. It will take a ...
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0answers
45 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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1answer
3k views

Windows 8.1 UEFI x64 & Windows XP x64 Dual-Boot

I want to add option to boot in XP into the Win8.1 boot menu. So I have 2 drives: On the first one I have installed Windows 8.1 x64 UEFI; And on the second - Windows XP x64. Following is what I ...
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2answers
127 views

Laptop won't boot to either the CD/DVD or to a USB Flash Drive

Update: Apparently Diskpart should display unused usb ports as well as the DVD/CD player. Mine doesn't. All I can see here is the laptop hard drive. I'm suspecting this is a more serious issue ...
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2answers
182 views

How are the initial boot files found in UEFI

I was curious and poking around my Windows 8 system. Per Wikipedia's entry on UEFI Boot loaders can also be automatically detected by the UEFI firmware, to enable booting from removable devices. ...
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1answer
80 views

Windows 8/8.1 UEFI Secure Boot custom keys

Is there the ability to run the OS Windows 8/8.1 with custom keys? I created my certificate with "makekert" utility, then i use signtool to sign files "memtest.efi", "bootmgfw.efi", "bootmg.efi", ...
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2answers
77 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 ...
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0answers
64 views

UEFI Boot Loader With BIOS Boot loader on same HDD

When we install an operating system on a PC, it either installs it as UEFI or in the BIOS mode. So, When Installed using UEFI, the OS install makes some additional 200-600 MB partitions(FAT32), Which ...
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44 views

Windows 7 changes my uefi default boot when it starts

I installed Windows 7 in a HP Compaq 6300. First I disabled secure boot and enabled legacy mode. Then I installed Ubuntu in other partition. Ubuntu detected some uefi partitions and let me create / ...
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2answers
12k views

UEFI Legacy boot hidden - tricks to unlock it?

I bought an Acer Aspire E1-510P-4459 with Windows 8.1... And I am considering installing Linux on it; maybe Win7, but I'd need to get a USB CD for that. So I downloaded a live image of my favourite ...