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Windows Teknik Solution Merkezi

Windows UEFI, EFI, and BCD Repair: Using BCDBoot Correctly

Getting a success message from BCDBoot alone doesn't prove you used the correct EFI partition. The Windows folder, the EFI FAT32 volume, and the physical disk match must all be verified together.

FAT32UEFI system partition
100-300 MBTypical EFI partition size
DETAIL VOLUMEMatching the physical disk
BCDBOOTRegenerating boot files
01
TEŞHİS

Belirtileri correct katmana ayırın

Aynı açılış ekranı different nedenlerle oluşabilir. Önce gözlemlenebilir belirtileri kaydedin.

0xc0000001 or a Boot Manager error

The BCD entry may not be reaching the Windows loader.

Two EFI partitions present

Multiple hidden FAT32 volumes can exist due to two disks or a leftover old installation.

Windows isn't visible on C:

Since WinRE reassigns drive letters, the installed Windows may be on D: or another letter.

"Boot files successfully created"

The files were copied to the target EFI partition; the next boot still needs to be tested.

02
KÖK WHY

En olası nedenleri risk sırasıyla inceleyin

Tahminle sürücü silmek veya bölüm biçimlendirmek yerine geri döndürülebilir testler uygulayın.

High

Running BCDBoot against the wrong EFI volume

If the boot entry is written to the wrong disk, BIOS selection or disk removal will cause problems.

High

Specifying the wrong Windows source path

Use the actual D:\Windows path instead of an empty C:\Windows.

Medium

UEFI/Legacy mode mismatch

On a GPT installation, use /f UEFI along with UEFI mode in the BIOS.

Medium

Leftovers from an old Windows installation

A Windows.old folder or an old EFI entry on a second disk can cause confusion.

03
GÜVENLİ ÇÖZÜM AKIŞI

Adımları sırayla ve tek değişkenle uygulayın

Her aşamadan sonra sistemi test edin. Birden fazla değişikliği same anda yapmayın.

01

List disks and volumes

Use DiskPart to see the GPT flag, volume size, file system, and drive letters.

02

Find the disk holding the Windows volume

Use select volume and detail volume and note the Disk 0/Disk 1 information.

03

Select the EFI volume on the same disk

Being a 100 MB FAT32 volume isn't enough on its own; it must be on the same physical disk.

04

Assign a temporary drive letter

The assign letter=S command only provides access for the recovery session.

05

Run BCDBoot

Explicitly specify the source Windows folder and the target EFI drive letter.

06

Remove the USB drive and select Windows Boot Manager

On the first boot, test the correct Windows Boot Manager entry from the boot menu.

04
KOMUTLAR

Komutları real Windows harfine göre çalıştırın

Kurtarma in the environment Windows bölümü C: olmak zorunda değildir. Örneklerdeki D: harfini kendi sisteminize göre değiştirin.

Disk layout
diskpart
list disk
list volume
Windows volume
select volume 3
detail volume
EFI volume and drive letter
select volume 4
detail volume
assign letter=S
exit
Boot files
bcdboot D:\Windows /s S: /f UEFI
Yüksek riskli komutlar

format, clean, delete partition, convert ve rastgele active komutlarını yedek ve disk eşleşmesi olmadan kullanmayın.

05
SIK SORULAN SORULAR

Kritik karar noktaları

Should I format the EFI partition?

Usually no. First rewrite the files to the existing FAT32 partition using BCDBoot. Formatting is high-risk and unnecessary in most cases.

Does the S drive letter become permanent?

A letter assigned in the recovery environment usually doesn't show up in normal Windows; if you want, remove it with DiskPart's remove letter=S.

The BCDBoot command isn't recognized, what should I do?

Check the spelling is bcdboot, or use the full path X:\Windows\System32\bcdboot.exe.

Two Windows Boot Manager entries appear, which one is correct?

In the BIOS boot menu, choose the entry belonging to the physical disk that holds Windows; match it against the disk model.

07
İLGİLİ REHBERLER

Sonraki correct adıma geçin

EKA SUNUCU TEKNİK BİLGİ MERKEZİ

Önce veriyi koruyun, sonra sistemi onarın.

Bu rehberler formatı ilk seçenek as değil, correctlanmış diagnosisten sonraki son seçenek as ele alır.

Technical support
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