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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5answers
25k 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 ...
31
votes
2answers
95k 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 ...
3
votes
4answers
17k 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 ...
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3answers
986 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 ...
3
votes
1answer
7k views

EFI booting and EFI Boot Partition

I read that there needs to be an EFI system partition. Wikipedia - http://en.wikipedia.org/wiki/EFI_System_partition The EFI System partition is a partition on a data storage device that ...
3
votes
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?
13
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1answer
2k views

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 ...
7
votes
2answers
8k 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
votes
0answers
976 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 ...
3
votes
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 ...
2
votes
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 ...
2
votes
2answers
899 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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vote
2answers
585 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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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 ...
0
votes
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 ...