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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1answer
282 views

FreeBSD Install DVD corrupted my Mac OS X harddisk

Recently, I have tried a FreeBSD 7.4 i386 Install DVD, just to see some screens of FreeBSD on my Mac mini Intel 2006. I was going to see (to remember) just several dialog screen of and perhaps I would ...
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1answer
3k views

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
974 views

Understanding firmware.scap

So, I recently acquired an old MacbookPro (v.5,4 mid 2009). I decided to create an Arch linux partition, and thus began my adventure... While installing rEFInd (the maintained fork of rEFIt), I ended ...
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1answer
251 views

Boot menu not working

So basically I can't boot from my ssd anymore. It just shows a grey screen with an error symbol. I can't get into target disk mode and none of the other boot shortcuts seem to be working either. When ...
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1answer
51 views

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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1answer
303 views

MacBook Pro Mid 2012 Windows 8 install on SSD

I am trying to install Windows 8, efi, on my SSD. I am getting the error code: 0xC0000005 "Windows installation encountered an unexpected error. Verify that the installation sources are accesible, ...
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0answers
678 views

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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0answers
67 views

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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0answers
4k views

rEFIt boot changed after update to Yosemite

I was using rEFIt to work with Ubuntu with my Mac. After the upgrade to Yosemite I had a problem with rEFIt. I found the following solution on ubuntuforums.org but rEFIt still didn't work: cd ...
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0answers
497 views

Accidentally Removed EFI Partition

I removed the EFI partition accidentally but I have it on a Time machine backup. Is there a way to simply move it from my external drive to my boot drive. I've tried restoring the format of the ...
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0answers
53 views

How do I get my dual boot to behave correctly?

Once upon a time my Mac had only OS X on it, but at various points in history it contained different versions of OS X and several different Linux distributions and their boot menus. I also had rEFIt ...
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0answers
443 views

Corrupted hybrid GPT disk and possible fixes

I have a 17" Mac Book Pro (Late 2011) which have dual boot Windows 8.1 installation via Bootcamp along MacOSX. Prior to Mavericks upgrade I had this disk layout EFI Machintosh (~115 GB) Bootcamp ...
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0answers
217 views

Impossible install Mac OSX, probably firmware damaged

Yesterday evening I install update on my MacBook Unibody (Version 6,1; Late 2009). The update run on Mac OS X 10.8.5 consist in security update and new version of Safari and iTunes. The update is run ...
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0answers
660 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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0answers
1k views

How to create linux USB discs that do work on Apple Macs?

It seems that there are several problems releated to incompatibilities between Apple-EFI and UEFI that do prevent Apple users from easily using USB drives to install or even run other operating ...
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0answers
512 views

How do I install Linux on a late 2012 mac mini?

I installed a 2nd hard drive in my late 2012 mac mini. This hard disk had Mint Linux - 12 on it (Installed when it was in a different computer). Pressing the Option showed me two additional hard disks ...
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0answers
416 views

Replacing OS X with Linux or Unix, and making the switch to Tiling Window Managers

I have a Macbook Pro 8,2 and really want to make the switch to something a little less stubborn and a little more flexible than the proprietary Mac OS X. I am a bit frustrated with MacPorts lately and ...
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0answers
27 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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0answers
65 views

Add an exeption to the Apple EFI (option) boot menu

I have just installed Ubuntu on a partition of my HD. I am using a MacBook Pro Mid 2012. I know that to launch Ubuntu, you need a third party EFI booter such as rEFInd. I have installed that, but I ...
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0answers
42 views

Reset MacBook Pro Boot Location

I logged into my friend's MacBook Pro 13 as Guest User to install OS X Yosemite on a USB flashdrive. I downloaded the Installer from the Mac App Store and stored it somewhere within the Guest User's ...
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0answers
51 views

Upgrading a 1st Gen Macpro to 64-bit EFI

I'm still running my trusty 2006 MacPro 1,1. After various upgrades and mods which have all inexpensively helped performance no end I'm contemplating upgrading the machine's 32-bit EFI with the 64-bit ...
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188 views

Does Apple's EFI patch Thunderbolt devices to Windows 10?

So, I've been rattling with myself about this for a bit. I've followed 5SH-2a's guide of EFI Bootcamp to no avail. I decided to try it on my own, by mapping an NTFS Partition on my hard drive to a ...
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0answers
27 views

Verify the EFI firmware

I'd like to copy the EFI firmware currently installed on my MacBook Air to a file on disk, so that I can compare it with the EFI firmware on other machines. I've seen advice on reflashing the EFI ...
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0answers
1k views

How to recover fully formatted EFI partition?

I have macbook 4,1. I tried to install on it ubuntu and fully formatted hard drive. So, there are any way to restore efi partition? (now all apple bootable cd display stop sign and do not work) I ...
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0answers
485 views

Efi Boot appears on BootCamp page

I'm new in this forum and I hope someone has an answer for my issue. Since yesterday my mac-book pro won't boot in Os X I have boot-camp on it If I turn on normally the apple logo, loading circle ...
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817 views

Repeated Kernel Panics & Freezing on Late 2012 Mac Mini 6,1. Help please with the Log

I've had massive problems with my Mac Mini recently. It has been freezing and rebooting after around 10 to 50 minutes use. It's a Late 2012 Mac Mini 6,1 with 8gb of memory. The problems got worse ...