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

learn more… | top users | synonyms

-1
votes
0answers
18 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, ...
0
votes
0answers
20 views

Can't boot Windows 8.1; Getting CRITICAL_SERVICE_FAILED

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 ...
0
votes
0answers
9 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 ...
0
votes
0answers
16 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 ...
0
votes
0answers
27 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 ...
0
votes
0answers
24 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 ...
1
vote
1answer
39 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 ...
0
votes
1answer
25 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 ...
0
votes
2answers
31 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 ...
0
votes
0answers
28 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 ...
2
votes
2answers
51 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 ...
0
votes
0answers
29 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 ...
1
vote
0answers
36 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 / ...
0
votes
1answer
65 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", ...
0
votes
0answers
29 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 ...
1
vote
2answers
61 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 ...
1
vote
2answers
67 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 ...
-1
votes
0answers
65 views

Can't boot SSD in UEFI mode after windows installation

I'm trying install Windows 8.1 on my new PC, but I still get message Windows can't be installed on this disk. I am installing from DVD. Only way the installation is working is boot DVD in UEFI, ...
0
votes
0answers
20 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 ...
-6
votes
1answer
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 ...
0
votes
0answers
43 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 ...
0
votes
1answer
40 views

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 ...
0
votes
0answers
30 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 ...
0
votes
0answers
10 views

No efivarfs filesystem is mounted

My Gentoo x64 system is boot from EFI, and I can see files in /sys/firmware/efi/efivars. But when I try efi-readvar, I got No efivarfs filesystem is mounted In my kernel configure file, I have ...
0
votes
0answers
18 views

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. ...
0
votes
1answer
345 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 ...
1
vote
1answer
206 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 ...
0
votes
1answer
57 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 ...
2
votes
2answers
126 views

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 from UEFI requires: rewriting the partition table and formatting as FAT32 ...
1
vote
0answers
32 views

UEFI shell mode with no colon key

I have a newly built PC with a UEFI-enabled motherboard and I'm having trouble getting my DVD drive to boot into UEFI mode so I opted to boot into UEFI Shell to manually start the DVD in UEFI mode. ...
0
votes
1answer
63 views

Avoid UEFI Bios Hell? [closed]

It seems so many people are having problems with UEFI these days, i'd be tempted to find hardware that doesn't come with it. Installing Linux alongside Windows is once again a real mess. Maybe the ...
0
votes
0answers
141 views

Dell Vostro 5470 - unable to install Windows 8

Has anyone experienced issues with installation of Windows 8 with Dell Vostro 5470? I bought it today, it came preinstalled with Ubuntu 12.04. The issue, as I understand and was able to Google out, ...
0
votes
1answer
381 views

Cannot enter BIOS setup on HP ENVY Sleekbook 4, EFI partition broken

I'm running into great trouble with an HP ENVY Sleekbook 4 with an existing Windows 8 installation failing to boot after installing Ubuntu 14.04, and data in the EFI partition is broken (the ...
0
votes
0answers
70 views

Caution: invalid backup GPT Header (gdisk)

Each time I boot into my Ubuntu installation, when I open gdisk I am given the messages: GPT fdisk (gdisk) version 0.8.8 Type device filename, or press <Enter> to exit: /dev/sda Caution: ...
1
vote
2answers
132 views

Move Windows 8.1 installation to another PC - is it possible to avoid a re-install & just move the hard drive?

Last year I've installed a clean copy of Windows 8 (later upgraded to 8.1) on a new laptop. This process was challenging because the laptop included Windows 8 pre-installed (plus bloatware), and my ...
0
votes
0answers
300 views

How to generate Asus BIOS rescue password?

I have an ASUS laptop. The problem is that I've forgot my BIOS password. I've clicked Win+r in order to get a date upon which a rescue password would be generated. The date is that of today ...
0
votes
1answer
38 views

uefi: linux live cd/usb blackscreens

I have a Medion Akoya P2310 D PC with Windows 8 pre-installed, and I have been trying to install Ubuntu alongside it as well as making a third partition for data storage. After struggling with UEFI ...
0
votes
0answers
52 views

Extra boot options in BIOS

I've got two extra boot options in my BIOS called ubuntu. There is a picture of them for reference, and they've got a portable hard drive icon in UEFI BIOS. Does anyone know how to get rid of them? ...
0
votes
0answers
37 views

How to make arch linux use my EFI partition?

I try to install Arch Linux in a Liva mini pc kit -- basically a 64bits intel-based minit computer. That computer has 4 partitions inside an eMMC memory. I've tried to use one of those partitions for ...
0
votes
1answer
53 views

How do I boot into UEFI without going through Windows on my laptop?

So I installed Ubuntu on my Windows 8 laptop in a dual-boot configuration for some time, and tonight, I decided I would uninstall Ubuntu. Well, I've managed to lock myself out of Windows and I'm stuck ...
1
vote
1answer
137 views

Attempting to install Windows 8.1 as secondary OS, misdetects EFI partition

Currently I have Arch Linux installed as my primary OS, and wish to install Windows 8.1 as a secondary so I may utilize certain special hardware (a capture card which has no Linux drivers at the ...
0
votes
0answers
45 views

Asus M5A97 LE R2.0 failure to post with peculiar PCI card

We have a couple of peculiar PCI cards being used in a circ. 2007 proprietary phone/radio communications logging appliance(WindowsXP PC). Both the card connectors and the old motherboard sockets ...
1
vote
1answer
39 views

How can I change my BIOS startup screen? How can I backup my BIOS?

I want to know all the safe ways to change the bios startup screen for my lenovo Y500. Instead of lenovo's logo can I have a GIF? Can I have sound with it? Can I time it such that the screen is blank ...
1
vote
1answer
48 views

How to make Windows 8 Show Advanced Startup On Boot?

I can't seem to find a way to do this, I already know how to initialize an advanced startup in Windows 8 and I have also gone through this question, but that's not what I want, I want the advanced ...
-1
votes
1answer
69 views

How is UEFI pronounced? [closed]

UEFI stands for unified extensible firmware interface. Most people know about BIOS (Basic Input/Output System) and to my knowledge pronounce it universal as 'by-ohs'. I've looked around for the ...
0
votes
1answer
171 views

How to enable Fastboot again on BIOS?

I have recently replaced the hard drive of my Asus Zenbook UX303LN with an SSD drive and managed to do a clean install of Windows 8 thanks to the link below: If USB is not listed in BIOS as a boot ...
-3
votes
1answer
53 views

Ubuntu install on disk with Windows 7 UEFI

When I'm trying to install Ubuntu on computer with UEFI and Windows 7, I see no partitions! But when I'm running Ubuntu in live mode file system detect all partitions right (screenshot below). What ...
0
votes
0answers
120 views

Dual operating system, cannot boot Windows 8, tried Boot-Repair-Disk and Windows repair, GRUB, EFI

I used to have one hard drive(1TB) with Windows 8(64bit) installed, then i added a new hard drive(256GB) and tried to install Ubuntu in it. After installing Ubuntu to the new hard drive, I can only ...
0
votes
1answer
524 views

ASRock UEFI Setup Utility No option to disable secure boot

I want to downgrade my computer from Windows 8.1 to Windows 7. I originally had Windows 7 on my desktop, then upgraded to Windows 8, then Microsoft basically forced me to upgrade to Windows 8.1. I was ...
1
vote
1answer
72 views

Can a computer that uses EFI/UEFI rather than BIOS run a real mode OS?

Title says it all: could I get away with installing a real mode OS such as MS-DOS on a EFI-based computer? I understand that EFI-based computers still use "BIOS emulation" for compatibility reasons, ...