Extensible Firmware Interface is a specification that defines a software interface between an operating system and platform firmware

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Can't boot on OS X partition after resizing Windows partition

I initially had three bootable partitions: OS X Recovery for OS X Bootcamp (Windows 8) Now, on Windows, I decided to make my Windows partition smaller, reducing its size using the native Disk ...
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How can I boot a WinPE USB on a Macbook? [duplicate]

I have a 2008 Macbook Pro with OS X Yosemite and Windows 7 on a bootcamp partition. Yesterday while trying to create another partition (in windows) I accidently converted my basic disk of primary ...
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1answer
58 views

EFI Boot Windows 8.1 or 10 Install on MacPro4,1 / Mac Pro (Early 2009)

I would like to install Windows 8.1 or 10 on a separate single SSD disk in my MacPro4,1 (not yet flashed to MacPro5,1) using only EFI/GPT method. The machine has a 64Bit EFI (rEFIt reports version ...
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How can I install Fedora Linux on a MacBook Pro, Model A1150?

I performed the following steps: Formatted a USB Flash Drive as: FAT32 Copied the Fedora Live ISO image to: /efi/boot/boot.iso Copied ISO 2 USB EFI Booter for Mac to: /efi/boot/boot.efi I then ...
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Boot Windows from USB with EFI password

I've created an USB with Windows 10 from where I can boot: Restart pressing option. Select USB EFI partition. Windows starts. When EFI password is active it will be asked when booting pressing the ...
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1answer
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Does Windows, running on latest Apple computers, see boot disk partitioned as MBR or GPT?

From my understanding, the newest apple computers boot Windows in EFI mode. Traditionally, Windows has seen the boot disk as an MBR partitioned disk. In fact, the boot disk (i.e. /dev/disk0) has aways ...
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53 views

Installing El Capitan from a bootable DVD

I have El Capitan on a bootable DVD. I restart my Mac and hold the option key until the disks come up and I choose EFI Boot (name of the disk is different than what it shows at the time of booting). ...
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Mac OSX EFI problems, urgent help needed!

So, I recently did an update on OSX, booted my computer up and I discovered that I the update replaced my EFI boot rom and the SMC with the incorrect SMC, so now I can't use my battery and the ...
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1answer
127 views

How do I install Windows on separate disk using GPT/EFI and BootCamp?

I have a Late 2012 27 inches iMac with an internal HDD (that has a Macintosh HD partition, an EFI partition and a Recovery partition) and an SSD. I installed Windows 10 on using BootCamp Assistant; ...
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1answer
153 views

Mysterious “EFI Boot” partition appearing at startup?

A few days ago, I tried installing Windows 8.1 on my late 2011 Mac by using disk utility to make a free space on my disk and a Windows 8.1 boot drive to install. While installing, my Mac recognized ...
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Why do we need /usr/standalone/i386/Firmware.scap file?

I am sorry for bad english - this is computer translation. Continuing the theme begun in the here and the here There Giuseppe9000 wrote: The file is needed in the boot process I renamed the ...
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firmwaresyncd - ESP Firmware.scap - /usr/standalone/i386/Firmware.scap

Please explain why /Volumes/EFI/EFI/APPLE/EXTENSIONS/Firmware.scap is overwritten every time you boot (as indicated below) though the file is not used while booting? host:~ user$ man 8 firmwaresyncd ...
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1answer
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/Volumes/EFI - Firmware.scap & MBA41_0077_B12_LOCKED.scap

Sorry for bad english - this is computer translation. See figure - MBA41_0077_B12_LOCKED.scap (# 2) - is the actual firmware of my MacBookAir4,1, which is was used to update firmware, but that such ...
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3answers
70 views

Swapping HDDs w/ Different OSX Versions, Possible?

My situation: I have a "late '08 aluminum" Intel 64-bit MacBook, still have Snow Leopard installed, and XP via Bootcamp, all on the original hard-drive. Yes, it's my "legacy" setup. The HD is 7 years ...
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1answer
27 views

File types in EFI partition

In El Capitan, I mounted the EFI partition using sudo diskutil mount /dev/disk0s1 and instead of finding apps that I can run, I found .scap, .smc, .epm, and .efi files. What are these? The reason I ...
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1answer
807 views

How do I restore my missing partition and install Windows 7 64-bit?

I previously had a Windows 7 32-bit installed on my Mac using Boot Camp Assistant. I recently upgraded it to Windows 10 (followed Microsoft update message), but later after I saw some drivers are ...
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2answers
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Macbook Pro: How to disable discrete GPU permanently from EFI?

I'd like to disable the NVideo GTX 750M GPU on my Macbook Pro 15" (Retina, Mid 2014, OSX 10.10 Yosemite). I know I can use GfxCardStatus but I read I could have a more permanent solution by changing ...
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1answer
470 views

Efibootmgr command for OS X

I have successfully been able to install Linux Mint on my Mac. The only issue is I cannot select the boot partition holding option. To fix it I booted into linux and ran sudo efibootmgr -o 1,80. This ...
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2answers
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Applying an old EFI update on a new version of OSX

I have El Capitan running on a MacMini 2010 that I use as a media player/server. The computer used to be my mother's and I have just noticed that she has never applied any of the firmware updates ...
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Does my stuck shift key affect the proper boot of my installation mediums?

I have a late-2009 unibody Macbook Pro. My left shift is stuck for ages and I have been avoiding this problem by pressing some other keys during boot to avoid safe mode and by using Karabiner to remap ...
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36 views

Create EFI partition on external HDD for rEFInd

How can I install Ubuntu and Windows onto my external HDD which already has OS X installed on it? I want to install it using rEFInd boot manager. If I can create an EFI partition for my drive then I ...
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2answers
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How can I install the newest EFI firmware upgrade from El Capitan?

I've got an early 2011 MacBook Pro (8,1) and I am trying to install the newest EFI firmware upgrade, however it only supports 10.8.5 and 10.9.5. Unfortunately I have no clue as to what the best ...
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1answer
962 views

Set EFI to boot Windows via (U)EFI one time

On my late 2012 Mac Mini, I have installed both Mac OS X Mavericks (with FileVault) and Windows 8.1 (natively, not via Bootcamp): /dev/disk0 #: TYPE NAME ...
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1answer
916 views

My CPU is running slow after a system restore (4x0.8 GHz). Turbo Boost is definitely not working. And how can I fix it?

Last weekend, my Macbok Air suffered a heart attack and I ended up doing several hard shutdowns due to an unresponsive system. In the end I had to do a full system restoration. Everything is working ...
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2answers
643 views

Getting my MacBook Air (2011) into Windows faster

Is there a way to reduce the time spent in EFI? It seems more than 15 seconds that the Mac (Macbook air 2011) stays with the screen grey before beginning to boot (or resume from hibernate) to ...
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1answer
383 views

GRUB 2 - “fb: swiutching to radeondrmfb from EFI VGA”

Whenever I try to boot Arch, Mint or Debian from a USB stick using GRUB 2 on my mac with compatibility mode, it freezes on this error (given in the question title). I've tried every available, up to ...
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1answer
630 views

How to fix broken GPT, GUID and unmountable, no type volumes?

I have a Macbook Pro with retina, Yosemite and 500GB hard drive. I tried to install Windows using Bootcamp and accidentally deleted a partition, now my Mac cannot boot anymore. This is the output from ...
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56 views

Issue with OS X Startup Disk in System Preferences when using EFI dual boot

I have Windows booting EFI on my Mac mini (Late 2012). It has two physical drives with one EFI partition (on the OS X disk). If I option boot I see OS X and EFI (Windows) choices and everything works ...
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Hide “disk password” login option at EFI (Filevault) login screen

I encrypted my volume before installation and have added my user as FileVault user afterwards. Now I can login with either the disk password or my user login password at the EFI (Filevault) login ...
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How can the average user easily validate the integrity of their Mac's firmware?

How can the average user easily validate the integrity of their Mac's firmware? Before you downvote this question or lecture me on how I am paranoid and no one should ever need to do that, please ...
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1answer
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EFI automounts on startup

After upgrading to the newest El Capitan from 10.10. to 10.11.1 - I guess - the normally invisible EFI partition appears on the desktop as a regular volume on different machines, if I choose to show ...
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How to transform an Apple Mac Mini intro a reliable Ubuntu Server?

This question is about what steps are needed for transforming an Apple Mac Mini into an Ubuntu server. Here are some areas: installing Ubuntu and making it to be bootable from EFI by default ...
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2answers
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How do I keep the Recovery HD and EFI partitions from automatically mounting on my MacBook Air?

I've set Finder preferences on my MacBook Air running OS X 10.9.1 to show everything on my desktop: I've noticed that storage partitions called Recovery HD and EFI appear there: What are they? ...
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15" MacBook Pro (2011) i7, 16GB ram, 1TB hybrid drive. EFI problem [duplicate]

Have been running in Win7 for awhile and needed to boot into Mac El Capitan. Option had my normal icons but my Mac partition now is labeled EFI Boot. Other icons are my Windows partition and Recovery ...
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269 views

Mac Pro, Boot into OSX without EFI after Bootcamp

I have a Mac Pro, early 2008. I installed Windows 10 using bootcamp. The mac came with an 8800gt, but I had a GTX680 from my other PC which I put in the mac, it is not the mac version so I don't get ...
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481 views

What is /Volumes/firmwaresyncd?

I keep seeing this in my logs: > 10/5/15 3:45:16.532 AM deleted[366]: normalizeUserMountpoint:738 > volRoot failed for /Volumes/firmwaresyncd.G3PNKw What is it? Is it related to the firmware ...
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443 views

How to use Testdisk under OS X recovery mode?

I accidentally broke the GUID, I suppose, when I was trying to solve the incorrect EFI partition problem. What I have now is: Disk1 is a 4 GB thumb drive with a recovery partition (disk1s2) I ...
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1answer
589 views

How to change the GPT partition type of an EFI partition?

I have a perplexing problem with the EFI partition on my boot SSD. The GPT partition type is "Microsoft Basic Data". On all other drives in my system, including my Carbon Copy Cloner clone of my boot ...
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1answer
130 views

Boot from external USB3

I've recently bought an usb3 flash drive where I've put a live kali linux distribution. When I try to boot my early 2015 mac book pro (with Yosemite) from this usb3 drive I have two options: windows ...
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4answers
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How to setup two OS X boot partitions plus Bootcamp and Data?

Is it possible to set up he following combination of partitions; how? two OS X partitions, each bootable (one for the main system, another for testing new OS X releases) a Bootcamp bootable ...
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221 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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4answers
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How to fix broken EFI partition?

I have an iMac running OSX Lion. I also installed bootcamp and Windows 7. During the install of Windows 7 I wasn't paying complete attention and deleted and formatted the EFI partition. I didn't ...
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2answers
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Any solution to bootcamp windows 8.1 with macbook pro 15" 2010?

This question may at first glance seem to be a duplicate but I am asking for an update and clarification to an unsolved problem. After extensively scanning the web, it seems that the consensus is ...
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2answers
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How can I repair EFI?

The computer is a MacBook Air. I have OSX Yosemite and Linux Ubuntu 14.04 dual boot. I messed up and damaged my Mac EFI and hence OSX ceased to work. Recovery disk was destoyed too. FileVault is on ...
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Resizing system partition

When I installed OSX Mavericks, I left free space after my system partition in case I wanted to install a second OS there. This has proved unnecessary — I've never modified the partition table — and ...
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Unable to use gpt to restore efi partition

I accidentally deleted my efi partition, which I now know is bad news bears. I found a guide here to restore it without losing data, but even though I'm booting from usb and have unmounted all ...
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0answers
154 views

Corrupt EFI Partition or Error b/c of Encryption? & Ghost Partition

I have a 2012 Mac Mini Server with two internal SSDs. Until recently, I had Mt. Lion installed on one of the SSDs, as my only boot drive, and used the other, rarely, for file storage. I created a ...
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1answer
596 views

How can I get Windows to install in Legacy (BIOS) boot on my mid-2012 MBP

I've got a 13" mid-2012 MBP running OS X 10.10.3 Yosemite. I've recently repaved it with a fresh install and now I'm getting round to Bootcamp`ing it. I've installed Windows 8.1 in EFI boot mode and ...
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3answers
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Is my UEFI bugged?

I just received the new MacBook Pro 15" (with basic configuration). When I press 'Alt.' during the booting process, I don't see the recovery partition. Also, the interface is not gray as it used to ...
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Where is the EFI stored on the macbook and is it possible to restore a previouse EFI firmware version?

I recently upgraded my macbook pro 2008 (not unibody, running 10.6.8) to mountain lion. Directly after the upgrade finished the machine ran smoothly. But after a reboot it does not boot at all (no ...