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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Multi-Boot: How to repair Windows 10 boot after Linux Mint upgrade?

I have an triple-booting iMac (Linux Mint, OSX, WINDOWS 10) with rEFInd installed. The following partitions listed using sudo gdisk -l in Linux Mint 17.3: Number Start (sector) End (sector) Size ...
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184 views

How to install Windows 10 after Debian

I want to install Windows 10 on my laptop with Debian Jessie on it. I installed my Debian in EFI mode with graphical options. Could someone point me to a good tutorial, what I have to set, what to ...
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109 views

Mactel Fedora 23 - Debugging Slow EFI Boot

I recently installed Fedora 23 on my Macbook4,1 (early 2008 model). After the white screen/apple sound at boot, I see a black screen with an underscore cursor for about 10-15 seconds before the Grub ...
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41 views

How to get config from a EFISTUB kernel?

I am working on getting normal Linux onto a x86 Android tablet. Only kernel I can find is efilinux.efi located inside the system’s ESP (\EFI\Intel\efilinux.efi). But I can’t get config through these ...
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67 views

Removing the EFI setup from the boot order

I own a Lenovo notebook (model Z570) on which I have already used a number of Windows and Linux installations pretty well, but now its EFI boot order seems to be broken. After the recent installation ...
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79 views

efi usb boot problems with linux mint 17.2

I've created a few usb boot sticks for linux mint 17.2 a few different ways (i.e, from both windows & linux) that all work correctly when trying to boot my laptop. However, when I try to boot ...
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36 views

Restore Windows From Data Backup?

So I managed to break my partition table, but I was able to recover my entire C: drive and copy every file and folder to an external drive. My question now becomes, is there anyway to, when I ...
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48 views

Move bootmgr from one drive to another (EFI)

My computer currently boots from my HDD, then loads the system located on my SSD. In the following picture, disk 0 is my HDD that contains the boot manager, and disk 1 is the SSD I want to boot from. ...
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48 views

No disks connected, why is Windows Boot Manager still a boot option?

Title covers 98% of my question. I'm trying to figure out what the Windows Boot Manager BIOS boot option is. In doing so, I've disconnected every memory device that could possibly hold an OS, ...
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111 views

How I create an USB entry on EFI boot?

I bought a second hand Samsung Ultrabook N530U3C which the boot is not working well. The previous owner managed to install linux and make it boot, but the USB entry on the EFI boot is not working. I ...
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169 views

Can't call grubx64.efi using startup.nsh in EFI

I installed Deepin 2014.3 on VirtualBox. When I launched it I got the regular skip startup.nsh message with the counter and the prompt right after it. My grubx64.efi resides under FS0:\EFI\Deepin ...
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261 views

Boot from USB/DVD in EFI Mode

I would like to perform a clean UEFI installation of Windows from a USB/DVD. That involves reformatting the disk to GPT and re-creating the EFI sector. My question is: how to boot from a peripheral ...
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97 views

What is the method of creating a Windows-booting EFI System partition?

I thought an EFI System Partition that boots Windows (specifically Win10, but I think the concept is the similar for all NT-based Windows) was a unique type of EFI system partition that can only be ...
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34 views

How can I delete all Windows Boot Loader entries and rescan?

I have reinstalled windows multiple times (over the last install) and it adds a new entry every time. Can I delete all Windows Boot Loader entries and rescan and just add those?
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679 views

How to set a partition type to ef02 with fdisk?

Setting a partition's type to ef02 is easy in gdisk. You just type it. However, I could not find a similar type code in fdisk. I don't want to use gdisk, because it force convert my drive to GPT which ...
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32 views

UEFI but not booting directly

I was playing around with my partitions finally now it doesn't boot directly. For it to boot I need to go to HP boot menu and then choose EFI file to boot to load the OS. Something like EFI partition ...
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936 views

I want to expand a partition on my boot SSD, but there is a Recovery Partition and EFI System Partition in the way. How can I get around this?

Here is a screenshot in Windows Disk Management showing the partition layout on my disk: I wish to expand the Windows partition (C:\ drive, "Boot") into the 16 GB of unallocated space. However, ...
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368 views

Windows 10 UEFI Install on Hp Envy 14 - 1190ea

I'm trying to install Windows 10 and boot through UEFI instead of Legacy BIOS on my HP Envy 14 1190ea. For the installation I have created 3 USB sticks with rufus: The first was configured as "MBR ...
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97 views

Prevent Windows from creating another EFI System Partition

/* EDIT * I used the Windows 10 enterprise evaluation is (Build 10240) */ I already have an existing ESP but Windows doesn't want to acknowledge it, apparently. I created the ESP with GNU parted ...
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152 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 ...
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89 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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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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102 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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74 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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958 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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275 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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813 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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416 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: eyal@eyal-Lenovo-Y50-70:...
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378 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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641 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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578 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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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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126 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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261 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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622 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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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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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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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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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
41 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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113 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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1answer
144 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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549 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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1answer
128 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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667 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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172 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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122 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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87 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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254 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 ...