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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Do I need to re-install windows 8 to enable UEFI?

I know that UEFI provides for much faster boot up speeds, but as of right now it is disabled in my BIOS. Should I enable it and it'll switch over auto-magically?
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1answer
10k views

How to disable efi on ASUS zenbook

I have just purchased an ASUS UX31A-DH51 Zenbook with Windows 8 preinstalled and I want to remove it and install Windows 7. However I can't load Windows 7, it hangs at the beginning of the install ...
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0answers
866 views

Why does Windows 8 takes longer to boot on EFI enabled system when EFI is not used?

I have a MacBook Pro and I installed Windows 8 on it. Windows 8 took ages to boot up (15 minutes atleast). Because the MacBook Pro is fast, I thought it must be a hardware problem and tried installing ...
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1answer
4k views

Windows 8 EFI issue

I am trying to install windows 8 on laptop with Raid 0 (stripe) as second system and have following error: Windows can't be installed on drive 0 partition 6 (show details) Details says: Windows ...
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2answers
2k views

Lost Windows 7 boot after EasyBCD with EFI

I've got a Lenovo Y580 with a 64GB SSD and a 1TB HDD setup using GPT and setup to boot from (U?)EFI. I was trying to get my Linux Mint installation on the Windows boot manager using EasyBCD (I ...
3
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1answer
8k views

How to install Windows with no CD drive boot option in BIOS?

I have a new computer which I built from scratch and I am trying to install a copy of Windows Vista on it. I am able to get to the BIOS and change the boot options which are as follows.. -Built-in ...
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0answers
165 views

elilo commandline boot config that includes spaces

I've got an elilo (EFI LILO) config file that includes spaces in the label - like that: image=/EFI/gentoo/boot/kernel-genkernel-ia64-3.1.6-gentoo label="Gentoo IA64 3.1.6" ...
2
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1answer
1k views

Resize EFI system partition

I have a Windows 8 installation on a 500gb hd with the following partitions; Recovery 300mb EFI System Partition (ESP) 100mb Reserved 128mb Primary 145gb Leaving me with free space of 319gb I'm ...
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3answers
4k views

How to boot Windows DVD without UEFI

I searched the web, but didn't find anything. I formated my single partition (300GB) to mbr partition table (it used gpt before). Now I want to install windows 7 but I can't because: Windows cannot ...
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0answers
215 views

Why wont my computer boot from the logical raid volume while installing Windows 7

I have new computer I built the motherboard is an ASUS Sabertooth 990FX. The motherboard has UEFI instead of normal BIOS. The problem I have is when I try to install Windows 7 with my motherboards ...
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0answers
2k views

How does the EFI partition work and can I boot an x86 OS with a bootx64.efi file?

I have a Thinkpad X230 laptop and I want to install Linux Mint Debian Edition along side Windows 7 on my GPT formatted SSD with the BIOS in UEFI mode. The problem is that I don't understand how EFI ...
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1answer
936 views

Can I “dual boot” grub-efi and grub-pc?

I am currently running Ubuntu with grub-efi and rEFIt on a Macbook (8,3). I'd like to have the option to boot Ubuntu in BIOS emulation mode as well. Is this possible? I guess I need grub-pc to write ...
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2answers
2k views

Macbook Grub2 EFI Installation

How exactly does grub2 works on Macbooks? Does it install Grub2 on the EFI partition and I can boot using the grub loader just as I do on a BIOS based PC? What is actually the consequences of running ...
8
votes
2answers
9k views

Tools to modify UEFI Variables in Windows/Linux?

I have a DELL machine that use Phoenix SecureCore Tiano as its UEFI/BIOS However, it is totally not configurable as its UEFI shell & menus are hidden in BIOS Setup. I'm wondering if there were ...
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1answer
3k views

Removing the EFI partition from external HDD on OS X

After formatting an external hard drive with OS X's diskutil, the disk is automatically split into 2 partitions like so: Finished partitioning on disk1 /dev/disk1 #: TYPE ...
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2answers
834 views

Problems with Windows 7 + Windows Server 2008 R2 multibbot on EFI computer

We have a new computer, and I am a bit confused from its new features I don't know from older hardware. It is a high end PC based on socket 2011. I want to use an SSD disk for operating system, and I ...
4
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1answer
8k views

How do the 'EFI system partition' and UEFI *.efi files relate?

I read that there needs to be an EFI system partition. The EFI System partition is a partition on a data storage device that is used by machines that adhere to the Extensible Firmware ...
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0answers
159 views

How to know if the BIOS in my Macbook Pro is running in EFI mode or BIOS emulation mode when in Linux

I totally replaced OSX with Linux. In Ubuntu 10.10, how can I tell which mode the BIOS is running in? Is it better to have it running in EFI mode?
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1answer
2k views

2.1TB limit on BIOS?

While checking out this 3TB 7200RPM drive as a candidate for my hardware RAID array, I saw the product video and at about 1:40 into the video, the guy says that BIOS can't handle more than 2.1TB of ...
3
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1answer
1k views

What are the .efires files on OS X Lion's Recovery HD?

If you mount the Recovery HD that enables OS X Lion File Vault 2, Safari mode, and certain recovery options, you see several .efires files. What format are those and what do they contain?
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1answer
309 views

Are 2011 Apple Macs EFI-ready for Boot Camp?

I would like to know if the most recent Apple Macs have the EFI firmware up to date to boot Windows through Boot Camp.
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0answers
2k views

USB mouse/keyboard not working in Windows 7 Setup DVD?

I've just updated my ASUS Sabertooth P67 BIOS from version 1305 to 1850 and I'm trying to reinstall Windows 7 (x64) but when I boot to the DVD, my USB keyboard and mouse don't work. They work fine in ...
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4answers
21k views

How to fix EFI-boot on my Macbook Pro after Ubuntu install?

The MacBook does not boot. The screen stays blank (black) – not the grey, active screen like normal. To power off, I hold the power button down. After 5 boot attempts the MacBook finally shows the ...
2
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2answers
995 views

What can an end user do with efi or uefi?

Other than greater support for hardware, what advantage or use could an end user (read: NOT an expert) do with an EFI shell or EFI BIOS? I've seen the shell once on my MacBook Pro, but it seemed ...
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2answers
9k views

Windows 7 + Ubuntu dual boot + UEFI BIOS

I received a new Lenovo T420 laptop with Windows 7. The disk now contains: a hidden SYSTEM_DRV boot partition (1.17GB, 400MB used). I'm guessing this is the UEFI partition; the laptop comes with ...
2
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1answer
1k views

Windows 7 + Ubuntu dual boot + conversion to GPT

I have received a new Lenovo T420 laptop with Windows 7. The disk now contains: a hidden SYSTEM_DRV boot partition (1.17 gb, 400mb used). I'm guessing this is the EFI partition, the laptop comes ...
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1answer
514 views

Does Mac OS X Lion / 10.7 support UEFI 2.0?

I've been hoping for a while that Mac would move to UEFI 2.0 from the older EFI 1.x spec (for many reasons, such as an ability to boot Windows natively on UEFI without running it under bios emulation, ...
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3answers
1k views

What is the maximum number of partitions with EFI?

I was wondering what is the maximum number of partition on an GPT-partitionned drive under Linux. The GPT partition table can contain up to 128 partitions, but the device nodes for /dev/sda? (as ...
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5answers
29k views

How to know if my BIOS supports UEFI?

I recently bought a new Dell notebook for my girlfriend and I want to know if the computer comes with a UEFI BIOS, unfortunately I didnt find any information in the manual or on Windows, is there some ...
2
votes
2answers
1k views

Update MAC EFI to EFI 2.x

I've been doing a lot of research about installing Windows on Mac - without having a MBR and such. I'm trying to create a pure GPT/EFI system without MBR. Currently, Mac Bootcamp creates a hybrid ...
7
votes
1answer
588 views

efi and linux - bootloaders, and any performance advantage?

Modern systems seem to be EFI based, and while there's a specific version of lilo that works with it, i can't seem to find any mention of a efi varient of grub (edit - on modern debian derivative ...
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2answers
630 views

iMac boot from linux partition on external drive

I have the following "setup:" iMac (no internal drive/dead) --------- (Firewire) ------- [[MAC OS X]] | | | | (USB) | | | | [[MISC STORAGE PARTITION] [MISC STORAGE PARTITION] [EXT2 UBUNTU PARTITION]] ...
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5answers
14k views

Is there a list of available boot-args for darwin / OS X

In OS X you can set boot parameters with nvram boot-args=[options] Where the options I know about -v (verbose) -x (safe mode) and arch=x86_64 (boot into 64 bit kernel on 64 bit capable machines). ...
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1answer
4k views

HP ProBook custom boot logo

my HP ProBook 5420s supports custom boot logo but I can't get it working. It has UEFI (not BIOS), custom boot logo option is on and I have placed a 1366x768 (native.. also tried 1024x768 as guide ...
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1answer
2k views

How do you boot into EFI settings on an x86-64 MacBook Pro from 2010?

I'd like to get to the EFI settings page on my MacBook Pro. I haven't been able to find the keyboard sequence required to boot into this mode...is this still an option on recent MacBook Pro's or do I ...
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2answers
4k views

How to use ATA security on a hard disk in practice?

My SSD HD supports ATA Security. Does Macbook EFI and linux support it? I know hdparm does. Who will do the unlock at each bootup? Can I still set a password without erasing the disk? Update: removed ...
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votes
3answers
776 views

Can BIOS be eventually upgraded to EFI?

I have an Intel PM55 chipset in my notebook. Reportedly Windows 8 (aka Windows Next) will not support BIOS-based systems. Is my motherboard forward-compatible to house an EFI firmware?
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0answers
121 views

What should I look for in a Windows Home Server v2 (Vail) motherboard? [closed]

Suppose I plan to build a new WHS machine today, with the plan to install Vail on it whenever it releases. What should I look for? x64 CPU since Vail is 64-bit only UEFI for 3TB hard drives What ...
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2answers
2k views

How to force Mac to into dirty shutdown state on every power off?

As Far as I can tell no one has actually solved this debacle. How do you get a mac mini to power on every time the UPS it is connected to restores power? It is easy enough to have the UPS communicate ...
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1answer
1k views

On dual-boot iMac, after fixing “EFI Boot” issue, will booting Windows cause the same issue again?

On my dual-boot iMac, after fixing the well-known "EFI Boot" issue, will booting Windows cause the same issue again? I'm hesitant to try booting Windows until I hear from others. Details: It all ...
0
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1answer
1k views

EFI pxe network boot error [closed]

Asking this on both serverfault and superuser. When attempting to network boot RHEL 5.4 on an old ia64 machine I get the following error : So I've basically followed the tutorial here : ...
2
votes
3answers
3k views

Bootcamp doesn't boot after resize

I just resized my Windows 7 NTFS partition on my macbook using GParted. Now, when I hold down the option key at startup, this partition doesn't show up. My OS X partition shows up normally. So I can't ...
0
votes
3answers
484 views

Free, scriptable, partition manager for Windows

Are there any free scriptable partition managers for windows that can create an EFI partition? (Identifier 0xEF) EDIT: It needs to run on Windows XP (BartPE) EDIT 2: So it seems Intel has a 32-bit ...
2
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2answers
935 views

Unable to boot into Windows partitions on early-2008 MacBook Pro using Crucial M225 128gb SSD

I purchased a Crucial CT128M225 SSD on October 19th for my early-2008 17" MacBook Pro this week (Boot ROM: MBP41.00C1.B03). I'm currently running OSX 10.6.1. The Apple EFI 1.7 Firmware Updater says ...
13
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5answers
94k views

Can I delete the 'EFI System Partition' without harming other data on the drive?

I have three external HDDs in a USB enclosure. After a recent upgrade to Windows 7, during which these three drives were actually installed inside the PC tower, two of the three drives now have a ...
31
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2answers
99k views

How do I remove an EFI System partition from a drive in Windows 7?

I have an external HD which used to be my TimeMachine drive. I got a different drive for that, so I want the original drive back as an external on my Windows box, but it has this random 200 MB ...
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2answers
1k views

Snow Leopard 64 bits mode (EFI64 Firmware)

How do I get the EFI64 firmware on my iMac 20" (late 2006) with Intel Core 2 Duo?
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votes
4answers
1k views

Convert a GPT disk to MBR from XP

So I took some files with me on my external HDD while going on vacation. Through a series of events, I ended up storing the data in a NTFS formatted partition defined in a GUID Partition Table. The ...