EFI stands for Extensible Firmware Interface, and is an updated version of BIOS. It sits between firmware and the operating system in the software stack.

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18
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9answers
30k 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 ...
8
votes
2answers
2k views

How to get rEFInd working with FileVault 2 on OSX 10.8

I installed rEFInd on my new Macbook Air which I planned on using to do a dual boot to Linux, but prior to installing Linux, I decided to encrypt my drive. I knew I was going to do this, so I had ...
1
vote
1answer
19 views

Booting from Xubuntu 15.04 installation media hangs when booting with UEFI

I want to dual boot my laptop with Windows 10 and Linux. I'm attempting to install Xubuntu 15.04 x64 but when I boot from the installation media it hangs on starting version 219 then eventually my ...
0
votes
0answers
8 views

HFS+ external drive missing EFI, will not mount on Mac

First off: Fear not, I have everything from this drive backed up. I'm just trying to reformat it, but I had someone else attempt it on Windows which doesn't look like it helped. I'm a novice but ...
0
votes
0answers
11 views

System Image Creation Fails in Windows 8.1 Pro

I just finished installing drivers, updates and softwares on a new Windows 8.1 Pro installation. I am trying to create a system image, but the process fails due to a "Volume Shadow Copy size not ...
0
votes
0answers
13 views

Move Linux EFI to SSD

I have a Linux Mint 17.1 EFI installed on 500GB HDD. I would like to move it to new 120GB SSD. I resized partitions to fit 120GB SSD and did "ddrescue -v --force /dev/sda /dev/sdb" from LiveUSB but ...
1
vote
3answers
5k views

How to boot Acer Aspire Switch 10 from external media?

I have an Acer Aspire Switch 10 and I want to boot with a USB stick or a DVD-reader. I only can boot with a Windows 8 instal disk in it, having an EFI file on the DVD. With a recover USB stick (made ...
0
votes
0answers
35 views

Windows 10 EFI partition on different HDD

I've upgraded from windows 8.1 to 10. Once the upgrade completed I wanted to create a system image backup in case anything went wrong down the line. When trying to do this it said my backup size ...
3
votes
1answer
78 views

Bootloader issue - How do I completely remove Linux from my system? fully detailed description

The goal was to successfully install Windows 10 upgrade. System configuration : Dell Inspiron 3537, i5 4th gen processor, 6GB RAM, 1TB HDD, 2GB AMD Graphics. Before install : I have a Dual-boot ...
1
vote
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 ...
0
votes
1answer
18 views

Resize efi partition on windows

I have windows 8.1 How could I resize Efi partition on Windows because I don't have any other operating system please help
0
votes
1answer
24 views

Access EFI partition files in Linux

I am using Arch linux in dual boot with Windows 10 and I want to mount the efi partition in Arch and to delete some files from there, like old Ubuntu grub file and so on... How can I mount this ...
3
votes
4answers
26k views

How to fix EFI-boot on my Macbook Pro after Ubuntu install?

The MacBook does not boot. The screen stays blank (black) – not the grey, active screen like normal. To power off, I hold the power button down. After 5 boot attempts the MacBook finally shows the ...
1
vote
1answer
3k views

What is the correct way to install linux on a Macbook Pro

I've had a lot of trouble doing this. It always is unable to boot after installation (I get the famous question-mark in a folder thing). I've installed http://www.rodsbooks.com/refind/ however after ...
0
votes
1answer
53 views

install mint linux alongside ubuntu on lvm with EFI boot

I have recently moved to a new laptop (Lenovo Y50) and installed Ubunt 15.04 on it. I installed lvm so almost all the 1T HD is one logical partition. The other partitions are: ...
0
votes
2answers
3k 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 ...
0
votes
2answers
159 views

MacBook Pro (Early 2011, 8,2) will not boot Mac OS X after installing Linux

Until a couple of months ago, I loved my triple-boot MacBook Pro (early 2011, 8,2 with high-resolution screen). Then I tried to run the Mac OS X 10.10 (Yosemite) upgrade and everything fell apart. I ...
0
votes
1answer
128 views

Windows 8.1 and EFI, recovery partition deleted, can't boot

I have a Windows tablet PC (Odys Winpad) with 32GB HDD. I have created recovery USB disk and deleted the recovery partition (I wanted to win some more space). Now I can't boot any more: every time I ...
0
votes
1answer
59 views

Images (e.g. with Clonezilla) of Windows and Linux on a UEFI computer

I use Clonezilla with success for many years to make images from partitions that host Windows 7 or smaller and Ubuntu and other operating systems. Making images and restore them was easy for me. But ...
0
votes
2answers
9k views

How can I repair access to the Windows 8 recovery (maybe EFI issue?)

Notebook is ASUS G55VW (1 ssd, 1 hdd) issue is already described here http://rog.asus.com/forum/showthread.php?28454-G55VW-F9-not-working-after-restore-WIN-8 to sum: 1. I backuped whole system with ...
0
votes
0answers
26 views

How do I replace the dump of my USB recovery media with a more simple EFI partition in this situation?

The situation is as follows: this is a new Dell Precision M3800; it comes with a Windows 8.1 pro version and a USB recovery medium; the machine uses UEFI; I immediately scratched Windows and ...
1
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0answers
39 views

Linux and Windows EFI - Not enough space

I already have Windows installed on my machine, and I'm trying to install an EFI boot manager such as Grub, rEFInd, or gummiboot on Arch Linux. Whenever I try to install any of these three options I ...
0
votes
1answer
35 views

Why does Ubuntu keep the old vmlinuz files? Is it safe to delete them?

So, I was deeply annoyed by the multiple boot options on rEFInd bootup (I run about 6 OSes on my mac, plus some on a USB), and I thought to myself: "Why on earth do they keep multiple boot options for ...
0
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2answers
169 views

many unknown entities: Dual booting Linux, Mac, Windows using rEFInd

I have been using rEFInd ver 0.8.7 to boot Linux, Mac, and Windows on my MacBook pro 2013 model. I've recently updated my os from Maverick to Yosemite, and this problem happened: When ever I boot, ...
3
votes
2answers
2k views

Lost Windows 7 boot after EasyBCD with EFI

I've got a Lenovo Y580 with a 64GB SSD and a 1TB HDD setup using GPT and setup to boot from (U?)EFI. I was trying to get my Linux Mint installation on the Windows boot manager using EasyBCD (I ...
2
votes
2answers
143 views

How to delete OS from boot menu

After installing fedora and Centos and other OS now I have them all showing in my Boot menu [F2] on start up not the menu form the OS even after deleting them and reinstaling other OS - Ubuntu -so It ...
-1
votes
1answer
86 views

Mounting EFI partition on Windows [duplicate]

I'm trying to mount the EFI Partition from Disk Management but all the options for the EFI partition are greyed out, so I can't do anything.. here's a screenshot from the problem :
0
votes
1answer
107 views

Windows 8.1 EFI partition rebuild not working

It all began when I deleted the partition of an old Linux that was dual-booted with Windows 8.1 UEFI. This Linux system was using the Grub2 bootloader and was installed on a secondary disk. After ...
1
vote
2answers
51 views

Will erasing my entire hard drive to install a fresh copy of Windows 8.1 corrupt the EFI setup?

My Windows 8.1 installation is horribly slow. I don't know the exact reason but I've tried EVERYTHING I could to solve its sluggishness problem, but nothing worked. Therefore I plan to reinstall a ...
4
votes
2answers
18k views

Windows 8 EFI boot issue

I've got a simular problem as described in How can I repair the Windows 8 EFI Bootloader?, but with some different details. When I tried to change the bootsequence of my harddisks (of which 1 SSD) in ...
0
votes
1answer
209 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: ...
0
votes
1answer
28 views

Installing EFI boot on 128GB memory card

I am using laptop having 5200rpm hdd, and I stuck with its speed, so I was thinking to purchase a ssd which can improve performance but hdd are so expensive, and I can't keep both hdd in my laptop. So ...
0
votes
1answer
286 views

Is It Possible to Change BIOS on a graphics card to EFI?

I'll be using a PC graphics card in my Mac, but I know that there won't be a boot screen because PC graphics cards use BIOS instead of EFI. Is it possible to replace the graphics card's BIOS with EFI ...
1
vote
1answer
58 views

OS X only boots from redundant installer: how to instruct to use internal drive

I installed OS X Mavericks on a external hard drive. This caused a problem I did not anticipate: I can no longer boot from the internal Yosemite installation. How can I instruct OSX to boot from my ...
8
votes
4answers
50k views

How do I mount the EFI partition on Windows 8.1 so that it is readable and writeable?

Here is what I do: restart machine with Windows 8.1 determine "EFI System" partition with the Disk Management utility run command prompt as administrator type diskpart type select disk 0 then select ...
0
votes
1answer
53 views

How can I know which partition is EFI system partition?

I want to install ArchLinux from working dual-boot system. There's one step where I got stuck: # Mount the EFI System partition with: sh-4.3# mount /dev/sdaX /mnt/boot/efi I ran fdisk -l ...
1
vote
2answers
49 views

2 additional partitions next to windows 8

so im trying to move my windows to different disk without harming them, and suddenly I found those two partitions in my disk: Can I just delete them or are they something important? from what I ...
0
votes
1answer
278 views

Problems making recovery work on Windows 8.1 EFI - recovery partition in raw (data still accessible)

My problem started with a failed migration from HDD to SSD. I created the copy which should work without problems, but the SSD was somewhat incompatible with my setup (drive visible in BIOS, but not ...
-2
votes
1answer
269 views

chainloader and efi boot partitions

My recent attempt to install a multi-booting system onto my twin disk rig failed, though I had successfully installed Ubuntu, Linux Mint and Peppermint on disk 1, updating grub afterwards. When I ...
0
votes
1answer
61 views

Can someone explain how I got a Windows EFI error message without trying to install Windows?

I'm using a HP Z620 workstation. My main hard drive is Ubuntu, and it was working fine. I physically removed the hard disk with Ubuntu on and put in a brand new hard disk, and tried to install ...
0
votes
2answers
486 views

Is it possible to bypass the 5-second delay in EFI shell?

Due to my unusual hardware configuration (see Graphics card not working on Windows 8.1 on Mac), i am forced to set two PCI registers using the mm EFI command before being able to boot Windows. Right ...
0
votes
1answer
968 views

What is the C:\EFI folder on Windows 10 Technical Preview and should a user be able to modify it?

I have not seen a folder named C:\EFI before, but I was wondering why the default permissions are not more restrictive. Every user could just delete that folder. What is this folder and is it ...
0
votes
1answer
69 views

How to add Windows to grub?

The following is the list that I got when I executed the command sudo fdisk -l: Disk /dev/sdc: 120.0 Gb, 120034123776 bytes Id disk: 0x975e4baf /dev/sdc1 * 2048 206847 102400 17 ...
-1
votes
2answers
128 views

How to register/convert a restored linux OS (bios) to EFI booting

First let me explain my current set up. I recently scrubbed my two main drives and converted them to GUID. On the primary drive (sdb in my case) I have created an EFI boot partition (ESP) on ...
2
votes
2answers
2k views

How do I disable digital signature checking for Windows 8.1 EFI files?

I'm trying to patch my bootmgfw.efi file to change the background color of the BitLocker password prompt and other Windows bootup screens. I found the values to search for and replace for the color ...
0
votes
0answers
65 views

Windows UEFI repair

I have an Acer Aspire 571-series laptop that came with Windows 8 preinstalled (now upgraded to 8.1). Last week I installed the OS X Yosemite (hackintosh) to triple boot with Windows and Ubuntu, and ...
0
votes
1answer
40 views

Is there a way to tell whether my EFI bootloader would accept the signature of the binary without reboot?

Assume that I have just installed a signed EFI bootloader (e.g. grub2 from Ubuntu 14.10 amd64 on a Lenovo IdeaPad U410 which can only boot in secure boot EFI or legacy mode) on a machine from within a ...
0
votes
0answers
115 views

Why can't an acer aspire XC-703 turn on without his hard drive?

I received an Acer Aspire XC-703 and i tried to sobstitute the included 500GB hard drive with a 32GB SSD. But the pc won't even turn on (power led off, cpu fan stuck at max rpm, no video output) when ...
0
votes
0answers
137 views

How to create a bootable media from an .swm ASUS image file (set)?

After overwriting the EFI setup of a Windows 7 64-bit with a change of partition table (from msdos to gpt including copying partitions with dd from backup image) and installation of grub2 in a ...
0
votes
0answers
21 views

WIN8 EFI GPT hdd does not boot

I have followed instructions here to test GPT and EFI partitions. all scripts from website works fine in winPE but after reboot, computer does not find hard drive bootable. At first I thought i need ...