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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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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14 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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2answers
25 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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66 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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2answers
23 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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320 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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127 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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36 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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56 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
22 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
120 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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35 views

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
148 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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2answers
69 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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1answer
91 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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90 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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198 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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83 views

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 ...
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127 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
64 views

Windows 8.1 upgrade blew out other OSes on GPT disks?

I was multibooting an EFI laptop. The laptop was using GPTs, was using SecureBoot, and it had Windows 8.0, Ubuntu, Fedora and Debian on it. I updated the laptop to Windows 8.1 through the free App ...
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101 views

ArchLinux on MacbookPro 5.3 EFI single boot with hfs-bless

I want to try to install ArchLinux on my macbook pro 5.3 with EFI support, i don't want any other OS but Archlinux. but i am unable to convince Apple firmware to load my custom efi image. What i have ...
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319 views

Bios not recognizing USB in EFI mode

I got a brand new Laptop with pre installed windows OS i wanted to do a clean install Okay so this is what i did i created a bootable USB of windows 8.1 Pro. Then i booted my laptop which was by ...
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109 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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38 views

Can I repair EFI partition (Windows 8.1) from another Windows 8.1 Internal Hard or Ubuntu (Triple-Boot)?

I have a home-made Desktop PC with 2 Windows 8.1 (1 for Gaming, 1 for Regular work) and 1 Ubuntu. So last time I renamed my Gaming Windows from "Windows Boot Manager" to "Windows 8.1 Gaming" with ...
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784 views

Cannot EFI boot from Clonezilla disk image

I have created a Ubuntu Server 14.04 system that I would like to clone to several other machines with exactly the same hardware specifications. The system is an Intel NUC2820 with 30 GB SSD. The ...
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1answer
469 views

safe to delete EFI system partition (win7) on old drive after cloning?

a while back I cloned my old installation of win7 from my HDD to a new SSD using the tools provided by Samsung (if I remember correctly). I know I should have done a clean new install, but that's not ...
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157 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: ...
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176 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 ...
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662 views

winload.efi error code 0xc000000f

I just ran into a really strange problem with my new Surface Pro 3. Everytime I install the [september driver pack from Microsoft the device won't boot anymore (screenshot). The windows 8.1 is a vhd ...
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168 views

ASUS M5A97 EVO R2 linux flash drive boot issues

I have a FX-8350 with a M5A97-EVO R2.0 motherboard. I'm not able to boot an arch linux nor an openSUSE 13.1 USB flash drives. Both are able to show the booting menu (gummiboot on Arch and GRUB on ...
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915 views

How to add EFI entry by efibootmgr?

I installed stand alone Ubuntu on my laptop by formatting the HDD. Now HDD is not in my EFI menu. From a Live USB environment, I added the EFI entry, even by chroot. However, the EFI menu is reset to ...
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63 views

Boot Lubuntu on usb by reusing the boot function of an application? (in this case: DiskWarrior)

I have tried a lot of different stuff to get Lubuntu installed on my Macbook 1,1 (first Intel macbook). I just won't get a usb to boot. For the sake of comparison, it does work on my new Mac Mini ...
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71 views

Multi-boot encrypted operating systems on EFI

I'm getting ready to "redo" my desktop computer, encrypting all of my partitions as I install the operating systems. I currently boot with EFI. I'm looking to install both Ubuntu 12.04 (really ...
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1answer
687 views

Cannot boot on windows 8 after installing Scientific Linux 6.5

I had a standard toshiba latop (2014 model with EFI), which came pre-installeed with windows 8.1 and I tried to install Scientific Linux(SL) 6.5 in dual boot mode. Originally, I couldn't install it as ...
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48 views

Install Windows 8 on different partition than EFI

I've the following partitions: I want to install Windows 8 on /dev/sdb3, but how can I make sure that Windows will use the EFI partition on /dev/sda1? I'm afraid that Windows will create its own ...
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1answer
72 views

Can't install Windows on GPT device

I have a bit of a conundrum here. My windows installation doesn't boot with EFI, so the only way to boot from it is to turn off efi boot on my BIOS settings. Then I can boot into the disk, but my ...
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220 views

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

Due to my unusual hardware configuration, i am forced to set two PCI registers using the mm EFI command before being able to boot Windows. Right now i have a build of the EFI shell (my mobo does not ...
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1answer
953 views

Use shim with UEFI Fedora 20

How do I use shim with Fedora 20? I have the KDE version, if you need to know that. Running kernel 3.11, with secure boot enabled. At boot, this message is shown: EFI: Problem loading in-kernel ...
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44 views

No boot entry in msconif boot tab

I bought a new lenovo laptop with a micro-ssd slot. I bought a ssd disk from amazon. I installed windows 8.1 on the ssd and used the regular disk as data storage. The computer runs fine. However I ...
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1answer
912 views

UEFI - Linux Mint Boot from USB Doesn't work

I'm running Linux Mint (only OS other than in VirtualBox) and wanting to remove it. I've created a Live USB of Windows 8 using Windows 7 USB/DVD Download Tool - Yes, I know it says Windows 7 but I've ...
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641 views

How can I reset my BIOS password on my Acer W3 810 Tablet

I set a BIOS password on my Acer W3 810 Tablet and then forgot the password. How can I reset my BIOS password?
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1answer
352 views

How to log into Windows if I have deleted the EFI partition?

I've run into a problem while experimenting. I deleted my EFI partition while installing Ubuntu. I had Windows 8.1 pre-installed. I installed Ubuntu 14.04 LTS. Ubuntu runs fine. But there are no ...
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391 views

Are there any rescue CD's which are bootable on UEFI and or UEFI with Secure Boot enabled?

I'm looking for Rescue CD's like Hiren's Boot CD which allow me to boot without switching to BIOS or turning off Secure Boot. I had no luck finding such thing. Is it even possible to launch such an ...
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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 ...
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1answer
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What hardware device used to eat up 1.4GB of my 4GB RAM, and now suddenly after no hardware changes eats up 2.2GB?

This is more or less a continuation of What hardware device eats up 1.4GB of my 4GB RAM? While I have more or less accepted the solution there that for some mysterious reason, after a BIOS upgrade ...
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1answer
2k views

Deleted EFI partition Windows 8

I dual boot windows 7 and 8 and I accidently converted my windows 8 disk to dynamic while I was in 7. I used AOMEI Dynamic Disk Manager to turn it back to basic, but it removed my EFI partition. Now ...
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758 views

Repair EFI Bootloader?

I'm aware there are other topics on this subject, but i've tried the fixes to no avail, hence making this post. So I had a 1TB HDD with Windows 8.1 installed along with a partition with a recovery ...
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248 views

Automount NTFS partition with EFI/GPT

I have a multiboot laptop with EFI and GPTs. One drive is a shared drive formatted with NTFS. I was going to automount it at boot by modifying bits in /etc/fstab. However: # <file system> ...
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809 views

Windows 8 Boot process in EFI

I was trying to add Debian 7 boot entry to Windows boot menu using easyBCD. I accidentally deleted the Window 8 entry from the list now I get a BCD error when trying to boot. Error code 0x000098 How ...
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186 views

How can I move an Win 8.1 GPT EFI installation to a smaller disk?

which programs do you use to move a whole HDD (GPT EFI Win8.1 installation with the "boot" and "reserved" partition) to a (~10MB) smaller one? I tried "mini tool partition wizard" and "gparted live" ...