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

There is no official list, the common one are compiled into kernel it-self, other can be parsed by kernel extensions. Here is the list which I've found so far. General boot options: -v: Always boot ...
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42 votes
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How to delete OS from boot menu

The menu to which you refer is the firmware's built-in boot manager. Its entries are stored in NVRAM, and can be edited by any number of tools in various environments: Some EFIs provide a means to do ...
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21 votes
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How to hide EFI-partition?

Apparently, it wasn't the EFI- but recovery-partition, which showed up due to a bug being present in the upgrade to v1803 of Windows 10. Following simple line did hide it in an administrator command ...
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19 votes
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What hardware device used to eat up 1.4GB of my 4GB RAM, and now suddenly after no hardware changes eats up 2.2GB?

Solved :) The cause seems to be a strange feature in the UEFI implementation, which can also be seen in the Open Source TianoCore implementation: https://github.com/tianocore/edk2/blob/master/...
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  • 3,337
18 votes
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I want to expand a partition on my boot SSD, but there is a Recovery Partition and EFI System Partition in the way. How can I get around this?

Okay, I took the plunge and decided to try and fix it anyway, even if it involved deleting my Microsoft Reserved Partition. As Rod Smith said, the EFI System Partition is in a non-standard location as ...
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18 votes

Create EFI partition before installing Windows 10

Most likely, you won't need larger ESP (EFI System Partition). Windows OS loader is rather small and Fedora will most likely just install GRUB on ESP and place the rest of its boot files in /boot ...
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  • 52k
17 votes

What is an EFI system partition?

The EFI system partition (ESP) is a partition on a data storage device (usually a hard disk drive or solid-state drive) that is used by computers adhering to the Unified Extensible Firmware Interface (...
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16 votes

How to get out of EFI shell in virtual box

The EFI shell is a command-line tool similar in concept to bash in Linux/Unix/OS X or a Command Prompt window in Windows. It lets you view, delete, edit, and rename files, to update EFI boot manager ...
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14 votes
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How to set a partition type to ef02 with fdisk?

user2313067 is absolutely correct. What gdisk refers to as EF02 is shorthand for a GUID of 21686148-6449-6E6F-744E-656564454649 -- that is, it identifies a BIOS Boot Partition. There is no equivalent ...
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14 votes

How do edit the contents of my BIOS boot list?

You don't have a BIOS; you have an EFI (or UEFI, which is EFI 2.x), which is a replacement for a BIOS. Unfortunately, many people, and even many manufacturers, refer to their EFIs as "BIOSes," but ...
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14 votes

How to hide EFI-partition?

Following the instructions of user Japelo_1976 in this thread helped me. You have to delete the registry file with regedit for the volume you want to remove the drive letter. Open Windows ...
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11 votes
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How to scroll up and down in EFI shell

Yes, you can scroll. Use PgUp or Shift+PgUp to scroll it up. I have checked it in EFI shell v1 and v2 in virtual machines and in a real machine, all variants are working.
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  • 3,148
10 votes

Remove EFI System Partition

Assuming you are on Windows and are asking about DiskMgmt.msc: Run DISKPART, which is a command-line tool which uses the same Windows volume manager. Use list disk and select disk <number> to ...
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  • 376k
9 votes
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In EFI/ UEFI shell how to reboot or shutdown the system?

The command reset will do both poweroff and reboot. From the UEFI Shell Specification reset Summary Resets the system. Usage reset [-w|-s|-c [string]] [-fwui] Options -s Performs a shutdown -w ...
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7 votes
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Cannot EFI boot from Clonezilla disk image

After days of searching of course I find the answer myself an hour after I decided to post here. Using a Ubuntu-based version of CloneZilla I got it to boot in UEFI-mode which was able to update the ...
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  • 131
7 votes

How do I check if I have an EFI partition on my computer?

The globally unique identifier (GUID) for the EFI System partition in the GUID Partition Table (GPT) scheme is C12A7328-F81F-11D2-BA4B-00A0C93EC93B, while its ID in the MBR partition table scheme is ...
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  • 4,910
7 votes

How do I find out which EFI system partition is in use by Windows 10?

I'm attempting to configure the same on a Surface Book Gen 1. It appears that the way to identify is to run the following invocation at cmd: echo list volume | diskpart The bootable EFI ...
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  • 228
6 votes

How to get Asus motherboard to recognize EFI system partition?

First, some key points about EFI-mode booting: EFI firmware includes a boot manager that maintains a list of bootable files and devices in NVRAM, along with a priority list of what should be booted ...
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6 votes

How do I find out which EFI system partition is in use by Windows 10?

open a command prompt with admin privileges (approve UAC if demanded) start diskpart -> diskpart select your disk with efi partions -> sel disk 1 (if disk 1 is the correct disk) list your available ...
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  • 350
5 votes

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

The darwin kernel is called "xnu", the best I could do was to grep the source code for what was being looked for. Example: OS X 10.8.5 https://gist.github.com/reklis/fa26d4e8db62d6eea9ea Procedure: ...
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  • 409
5 votes

How to boot Acer Aspire Switch 10 from external media?

The secret to getting Windows 10 on this device is to boot with an OTG USB adapter. USB from the keyboard doesn't work. I pulled my hair out for quite a while before I tried an OTG micro USB adapter ...
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5 votes
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How can I know which partition is EFI system partition?

None of them. Either you don't have an EFI system, or Windows wasn't installed in EFI mode. If you had an EFI system partition, it would always have the ef type code instead of the usual 07 or 82, ...
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  • 376k
5 votes

How to enlarge Windows 10 EFI partition

To move sensitive partitions, you need to boot from CD or USB. Some free partition editors that have boot CD are : MiniTool Partition Wizard Free (Bootable CD) GParted Live Of the two, MiniTool has ...
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  • 407k
5 votes

UEFI "replaces" BIOS and "connects with firmware" but BIOS == firmware so WTF?

Different people use terminology in this area in different ways, so there's not 100% agreement, and that can lead to confusion. That said.... Firmware -- This term generally refers to software stored ...
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5 votes
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Run EFI files/scripts from [boot, virtual media] ISO

The below solution is implemented on Linux Mint 19 64 in Virtual Machine. Tools needed GParted – GUI tool to manage partitions. This is generally available in Live Linux CD/DVD. If you do not have ...
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  • 4,587
5 votes

access denied with bootrec /fixboot

FIXED! Thank god! The problem was that I was booting the recovery usb normally (just selecting the usb). It is super-duper-EXTRA important that you select boot to the usb UEFI option! Once I did ...
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  • 239
5 votes

EFI sig list converter or viewer

The efitools package contains the sig-list-to-certs tool, which allows you to extract DER-encoded X.509 certificates from the .esl files (e.g. to extract and print out the first KEK certificate): efi-...
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  • 51
5 votes

What Filesystems Are Supported by Lenovo And Dell Laptops on EFI System Partition?

Any vendor that will support in the UEFI firmware additional file systems like ext2/3/4 will be strictly non-standard and will require a specialized UEFI firmware. This is unlikely to exist (except on ...
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  • 407k
5 votes
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How to normalise Win10 MBR partition to migrate to GPT and standard EFI

Create the boot partition manually, format it, populate it using bcdboot. bcdboot C:\Windows /s S: /f UEFI Some official Microsoft guides on manual partitioning: https://docs.microsoft.com/en-us/...
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  • 376k

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