Encrypted efi. How to Delete EFI Partitions Mac OS

Hello! Windows 8.1 won't boot on laptop with UEFI BIOS and I can't do anything. When loading, an error occurs on the screen File: \ EFI \ Microsoft \ Boot \ BCD ... I studied all the Internet articles on this topic, but nothing helps in my case.

What have I done!

1. Loaded from installation disk Windows 8.1 and searched for the installed operating system with the command bootrec /RebuildBcd, an error occurred Scanning installed systems Windows completed successfully. Total Windows systems detected: 0»
2. Deleted a partition (300 MB), encrypted (EFI) system partition containing all Windows 8.1 bootloader files with the command del vol, then applied Automatic recovery boot, the system re-creates this partition, but does not boot. I made this section active on the command line, it did not help either.

I entered commands that are successful, but Windows is not loaded.

bootrec /FixMbr

bootrec /FixBoot

3. Also formatted the same partition (300 MB) Encrypted (EFI) with the command format fs=FAT3 and recreated it.
4. I tried to write for Windows 8.1 a new boot store with the command bcdboot.exe C:\Windows, where (C:) is the partition with the operating system installed Windows system 8.1 and I get the error againFailed to copy download files.

I don’t know what else to do and how to restore the Windows 8.1 bootloader. What can you suggest?

Hello friends! My name is Vladimir and I will answer this question.

If your Windows 8.1 does not boot and you have used all available means to restore the bootloader, then you can delete the system boot manager: the 300 MB encrypted (EFI) system partition, as well as the 128 MB MSR partition and create them again.

In Disk Management you can only see 300 MB encrypted (EFI) system partition, 128 MB MSR partition visible only on the command line when typing a command"lispar".

Note: If you are inexperienced, do not perform this operation unless necessary, use other methods from the section on first. If you want to experiment on a working laptop, then do not get started without first creating a backup copy of these partitions, but best of all, create a .

We will delete and create new partitions:

1. Section (400 MB) containing environment Windows recovery 8.1 (you can completely get rid of this section and use, if necessary, the recovery environment located on bootable media with Win 8.1).

2. Section (300 MB), Encrypted (EFI) system partition containing all Windows 8.1 bootloader files.

3. Service partition MSR (Microsoft System Reserved) 128 MB, required for partitioning GPT disks.

We boot the laptop from and in the initial window of the system installation, press the keyboard shortcut Shift + F10,

a window opens command line, enter the commands:

diskpart

lis dis (lists physical disks).

sel dis 0 (we select a 931 GB laptop hard drive, and a second 14 GB drive is bootable Windows flash drive 8.1).

lis par (show all partitions of the selected disk, we will delete the first three partitions).

sel par 1 (select the first section

del par override (delete the partition, to delete the ESP and MSR partition or the laptop OEM partition, you must specify the override parameter)

sel par 2

del par override

sel par 3

del par override

Everything, we deleted all three hidden sections.

Now, if you select a drive and enter the lis par command, then we will see only two partitions on the laptop's hard drive:

Section 4 - installed Windows 8.1

Partition 5 is a hidden recovery partition with factory settings.

Create a newly encrypted (EFI) 300 MB system partition, as well as a 128 MB MSR partition

We enter the commands:

diskpart

lis dis (displays a list of disks).

sel dis 0 (select laptop hard drive).

create par efi size=300 (we create an encrypted (EFI) 300 MB system partition).

format fs=fat32 (we format it into the FAT32 file system).

Got me strange HDD, it seems there was linux or MacOS. Deleted all sections, but one, standard means(Disk Utility and Disk Management) at 200 meters failed.

AT context menu paragraph Delete volume… is inactive.

Delete EFI Encrypted Partition in Windows 7 you can use a console program diskpart.

1. Launch cmd as administrator

2. Enter in cmd - diskpart. will start diskpart in a new window

list disk - look at the list of disks
select disk # - select desired disk. instead of # specify the disk number
clean - delete all partitions or volumes on the disk
list partition - check that all partitions are deleted

4. Check the result in Disk Management.

5. All sections are removed.

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In this article, we'll show you how to manually restore an accidentally deleted bootloader. Windows partition on a UEFI system. Initially, the article described my experience in restoring a bootable EFI partition on Windows 7, but the article is also relevant for modern operating systems Microsoft (from Windows 7 to Windows 10). It has helped me more than once after accidentally formatting or deleting an EFI partition in Windows 10. In this article, we will show you an easy way to manually recreate bootable EFI and MSR partitions in Windows.

So, suppose that somehow accidentally (or not very accidentally, for example, when trying) the boot EFI partition on a UEFI system (not BIOS) was deleted or formatted, as a result of which Windows 10 / 8.1 / 7 stopped loading, cyclically offering to select boot device (Reboot and select proper boot device or insert boot media in selected). Let's see if it's possible to restore Windows health when deleting a partition with Boot Manager without reinstalling the system.

Warning. The instruction involves working with disk partitions and is not intended for beginners. If the commands are interpreted incorrectly, you may accidentally delete all data on the hard drive. It is also highly recommended to create backup important data on separate media.

Partition structure on a GPT disk

Consider how the partition table of a bootable hard disk should look like with GPT markup on the . At a minimum, the following sections must be present:

• EFI system partition (EFI System Partition or ESP - Extensible Firmware Interface) - 100 MB (partition type - EFI).
• Microsoft Backup Partition - 128 MB (partition type - MSR).
• The main Windows partition is the partition with Windows.

This is the minimum configuration. These sections are created windows installer when installing the system on an unpartitioned disk. PC manufacturers or users themselves can additionally create their own partitions containing, for example, the Windows Recovery Environment in a file winre.wim(), section with in a backup way systems from the manufacturer (allows you to roll back to the original state of the computer), user partitions, etc.

EFI section with the Fat32 file system is required on disks with GPT partitioning on UEFI systems. This partition, by analogy with the System Reserved partition on disks with MSR partitioning, stores the boot configuration storage (BCD) and a number of files necessary for Windows boot. When the computer boots, the UEFI environment loads from the EFI partition (ESP) the bootloader (EFI\Microsoft\Boot\ bootmgfw.efi) and passes control to it. If this partition is removed, the OS cannot be loaded.

MSRchapter on the GPT disk is used to simplify partition management and is used for service operations (for example, when converting a disk from simple to dynamic). This is a standby partition that is not assigned a partition code. This partition cannot store user data. In Windows 10, the size of the MSR partition is only 16 MB (in Windows 8.1, the size of the MSR partition is 128 MB), file system– NTFS.

Manually creating EFI and MSR partitions on a GPT disk

Because the system does not boot correctly, we need an installation disk with Windows 10 (Win 8 or 7) or any other boot disk. So, boot from the installation disk and on the installation start screen, press the key combination Shift+F10 . A command line window should open:

Run the disk and partition management utility:

List hard drives in the system (in this example it is one, disk 0 . Asterisk ( * ) in the Gpt column means that the drive is using a GPT partition table).

Let's select this drive:

Let's list the partitions on the disk:

In our example, there are only 2 partitions left in the system:

• MSR section - 128 MB
• Windows system partition - 9 GB

As we can see, the EFI partition is missing (deleted).

Our task is to remove the remaining MSR partition so that at least 228 MB is left unallocated on the disk. free space(for MSR and EFI partitions). You can delete the remaining partition using the graphical GParted or directly from the command line (we will do just that).

Select the section to delete:

select partition 1
And remove it:
Delete partition override

Make sure that only the Windows partition remains:

Now we can manually recreate the EFI and MSR partitions. To do this, in the context of the diskpart utility, run the following commands in sequence:

Select disk:

create partition efi size=100

We make sure that a 100 MB partition is selected (an asterisk opposite the Partition 1 line):

list partition
select partition 1
format quick fs=fat32 label="System"
assign letter=G
create partition msr size=128
list partition
list vol

In our case, the Windows partition is already assigned a drive letter. C:, if it's not, assign it a letter like this:

select vol 1
assign letter=C
exit

Restoring the EFI bootloader and BCD in Windows

After you have created a minimal disk partition structure for UEFI systems, you can proceed to copy the EFI boot files to disk and create configuration file bootloader (BCD).

Let's copy the EFI environment files from the directory on your drive where your Windows is installed:

mkdir G:\EFI\Microsoft\Boot

xcopy /s C:\Windows\Boot\EFI\*.* G:\EFI\Microsoft\Boot

Let's recreate the Windows 10/7 bootloader configuration:

g:
cd EFI\Microsoft\Boot
bcdedit /createstore BCD
bcdedit /store BCD /create (bootmgr) /d" Windows Boot manager”
bcdedit /store BCD /create /d "Windows 7" /application osloader

You can replace the inscription “My Windows 10” with any other.

Advice. In the event that only the files of the EFI environment were damaged on the EFI partition, and the partition itself remained in place, you can skip the process of recreating partitions using diskpart. Although in most cases it is enough to restore the bootloader according to the article. You can manually recreate BCD on regular MBR+BIOS systems.

The command returns the GUID of the created entry, in the next command this GUID must be substituted for (your_guid).

bcdedit /store BCD /set (bootmgr) default (your_guid)
bcdedit /store BCD /set (bootmgr) path \EFI\Microsoft\Boot\bootmgfw.efi
bcdedit /store BCD /set (bootmgr) displayorder (default)

Further commands are executed in context (default):

bcdedit /store BCD /set (default) device partition=c:
bcdedit /store BCD /set (default) osdevice partition=c:
bcdedit /store BCD /set (default) path \Windows\System32\winload.efi
bcdedit /store BCD /set (default) systemroot \Windows
exit

We restart the computer ... In our case, it did not boot the first time, we had to additionally dance with a tambourine:

1. Turn off the power of the PC.
2. Disconnect (physically) the hard drive.
3. We turn on the PC, wait for the window with a boot error to appear and turn it off again.
4. Connect the drive back.

Then in our case (tested on ) I had to add a new boot menu item by selecting the EFI\Microsoft\Boot\bootmgrfw.efi file on the EFI partition.

In some UEFI menus, by analogy, you need to change the priority of boot partitions.

After all the above manipulations, Windows should boot correctly.