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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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 ...
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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 ...
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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 ...
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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 ...
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14 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 ...
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79 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 ...
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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
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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 ...
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54 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: ...
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129 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 ...
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164 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 ...
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63 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 ...
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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 ...
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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 ...
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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 ...
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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, ...
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2answers
144 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 ...
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87 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 :
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108 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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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279 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 ...
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62 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 ...
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270 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 ...
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70 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 ...
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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 ...
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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 ...
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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 ...
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117 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 ...
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138 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 ...
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972 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 ...
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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 ...
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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 ...
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164 views

How to install windows 8.1 using OEM provided install.wim and boot.wim

Unfortunately, recently, my C drive got corrupted and I had to format the whole partition and reinstall the untouched windows 8. There are 2 recovery partition in my laptop which includes install.wim ...
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39 views

UEFI ESPs and multiple disk drives

I have added a usb connected SSD (sdb) to my (originally Win8) UEFI Toshiba laptop...I am EFI multi-booting via GRUB2 just fine on my laptop HDD (sda)...I have installed a Manjaro KDE distro on the ...
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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 ...
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788 views

Linux Mint Installation : EFI Partition

I tried to install Linux Mint 17.1 MATE 64-bit edition on my asus laptop, which had installed Windows 8.1. I put CSM (Legacy BIOS) enabled, Secure Boot disabled, and boot with my Live CD USB (created ...
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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 ...
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190 views

Moved Windows partition to the left, won't boot (EFI)

I'm at my wits' end with this problem. I've searched all over, but can't find a solution. I'm fairly new to Linux, and not an expert with computers generally, but having been messing around A LOT ...
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1answer
151 views

EFI partition not found

I’m instaling Debian in a laptop that already has Windows 8 installed. Everything went right but when I finish the partioning, a message says: EFI Partition not found, do you want to continue? ...
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1answer
222 views

Debian + 4TB SATA + md RAID - Grub won't install, or if it does, won't boot

I'm trying to get Debian 7.8 amd64 setup on an system (G3220 CPU, mobo is an Asus H81I+) onto which I've installed two 4TB SATA hard drives. I admit I'm not up to snuff on EFI and such. My goal is ...
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Can I take out the HDD of an EFI/iCloud password protected Mac and clone it?

I have a situation in which I have Macs with an EFI and iCloud password protections, and I just need to clone the data in them (data far outweighs the device price), and I read somewhere that removing ...
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1answer
897 views

installing 32-bit windows: diskpart convert mbr error

I have an efi-based 64 bit system with win 8 pre-installed. I want to downgrade to 32-bit win 7 and so I booted up a bootable win 7 usb and opened command-prompt with shift+f10. I used convert mbr ...
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152 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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256 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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179 views

UBUNTU- How to fix windows boot configuration data when using

recently i used gparted to resize my partitions for windows 8 and ubuntu. Ever since then I have not been able to get onto windows 8. When ever i try clicking on the windows boot option (say is it on ...
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563 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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Windows 8.1 EFI Graphical Bootloader: Change OS Thumbnails

I've just used EasyBCD to tweak my Windows 8.1 EFI graphical bootloader, adding entries for Windows XP and Ubuntu. Both of them have a boring thumbnail of a window, while Windows 8 has a thumbnail of ...