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 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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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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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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30 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
26 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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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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9 views

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
114 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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59 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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42 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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14 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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79 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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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
60 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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18 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
89 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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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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33 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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24 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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145 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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23 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
59 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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42 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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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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36 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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25 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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33 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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43 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
100 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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65 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
40 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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56 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
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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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73 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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45 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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1answer
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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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46 views

Fixing a broken UEFI boot loader?

So recently I got a new SSD, and was moving my Linux boot partition to the new disk. All went well, there wasn't any problems and the OS booted successfully. My problem is that I then went to cleanup ...
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2answers
212 views

Problems with installing OS on ASUS M32AD (UEFI capable)

I have a brand new ASUS M32AD desktop computer. It came with Windows 7 Home Premium installed. After the initial configuration of Windows and some updates completed, I tried to upgrade to Windows 7 ...
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2answers
152 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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32 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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63 views

What does POST mean in the following sentence? [closed]

I don't like how this question is phrased, but my main issue here is POST.I know what each of them are beside POST, but how can I explain that? Furthermore, how can I explain UEFI? Isn't that a boot ...
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52 views

BIOS does not shows up Windows 8 EFI after Ubuntu install & incorrect partitioned size

I had window 8.1 preinstalled on my laptop. Recently I also installed Ubuntu alongside to have dual boot. But anyhow after install i.e. restart or due to some alteration; I can not see choices to boot ...
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How does it work UEFI find Bootloader boot from win 8.1 DVD even UEFI only supportFAT32 filesystem?

I assume UEFI boot win 8.1 DVD to load bootmgr.efi to install,but DVD is CDFS filesystem,UEFI only support FAT32,how does UEFI find the bootmgr.efi?I don't have a UEFI motherboard,how does UEFI load ...
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39 views

how to properly set up grub2 with uefi on gpt

I've recently installed fedora on new ssd disk. Info: GPT, uefi partitions: (lsblk) NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda ...
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Boot order changed after pulling harddrive out to install Win 10 Tech Preview to different harddrive

Ok, so to install the Windows tech preview to my other harddrive I decided to pull my current one out, install Win TP to a spare 250 gig, and after it finished I put my original harddrive back in. ...
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1answer
813 views

Create UEFI-bootable DVD with Windows 8.1 iso

I'm trying to set up a UEFI-boot of Windows 8.1. However, I seem to be unable to install it with a USB drive (previous question), and when I try to install with a DVD (the same iso), I don't get the ...
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1answer
285 views

Installing Ubuntu 14.04--Grub Rescue Error after failing to turn off secure boot [SOLVED]

I am not able to start the operating system .Whenever I try to start the operating system it shows the following error: file /boot/grub/i386-pc/normal.mod not found Entering rescue mode... grub ...
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1answer
95 views

gigabyte z77x-d3h not recognising hdd in bios

I have sata hdd and the bios is not recognising it. The hdd works as I have plugged it into a working pc and it appears. I have formatted in NTFS and run scandisk, no errors. is there any specific ...
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Do (USB) drives need a master boot record to boot in UEFI mode?

I was reading this tutorial and this (Option Two from there) and as far as I understand, making a Windows USB drive bootable for UEFI requires: rewriting the partition table and formatting as FAT32 ...