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.

learn more… | top users | synonyms

0
votes
1answer
37 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
24 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
29 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
0answers
24 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
vote
0answers
32 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
23 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
votes
2answers
91 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, ...
1
vote
2answers
69 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
45 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
70 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
45 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 ...
0
votes
1answer
26 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 ...
1
vote
1answer
47 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 ...
0
votes
1answer
41 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 ...
0
votes
1answer
176 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 ...
0
votes
1answer
57 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 ...
-2
votes
1answer
187 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
62 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 ...
2
votes
2answers
1k 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
50 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
32 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
94 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
92 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
1answer
774 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
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 ...
-1
votes
2answers
108 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 ...
0
votes
0answers
145 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 ...
0
votes
2answers
34 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 ...
0
votes
2answers
3k 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
616 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 ...
1
vote
2answers
47 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
0answers
157 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 ...
0
votes
1answer
82 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? ...
-1
votes
1answer
201 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 ...
0
votes
0answers
73 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 ...
0
votes
1answer
718 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 ...
-1
votes
2answers
129 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 ...
0
votes
1answer
196 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, ...
0
votes
0answers
159 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 ...
0
votes
0answers
505 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. ...
1
vote
0answers
119 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 ...
0
votes
0answers
170 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 ...
1
vote
1answer
80 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 ...
0
votes
1answer
175 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 ...
0
votes
1answer
893 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 ...
0
votes
0answers
139 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
59 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 ...
0
votes
1answer
2k 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 ...
0
votes
1answer
540 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 ...
0
votes
1answer
197 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: ...