Steps to Rebuild the UEFI Boot Partition and for Rebuild BCD

Question

Can someone please Lay out the Steps (Precisely) to Re-Instate the EFI Boot Partition and the Steps (Commands) to Rebuild the BCD for UEFI

Answer 1

Hello Nasho. I'm Greg, here to help you with this.

Did the EFI System partition get deleted? If so here is how to recreate it from scratch:

http://woshub.com/how-to-repair-deleted-efi-par...

All steps are here to repair or rebuild the BCD:

https://www.lifewire.com/how-to-rebuild-the-bcd...

https://www.thewindowsclub.com/rebuild-bcd-wind...

For the issue of Total Identified Windows Installations: 0 try these steps:

https://www.youtube.com/watch?v=yZPmoFS92m0

Everything else to get WIndows 10 started is here, including at the end a rescue install where you shrink C or a data partition to install Windows 10 to a Dual Boot, if it starts the old install you can then delete the Rescue install and use the new EFI System partition it creates:

http://answers.microsoft.com/en-us/windows/wiki...

Feel free to ask back any questions. Based on the detailed results you post back, I will have other suggestions if necessary.

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Answer 2

Let us see what you've got...

DiskPart >>>Enter DiskPart

List Vol >>>List volumes & letters

List Disk >>>List the disks

Select Disk 0 >>>Focus on disk 0

List Part >>>Show its partitions

Select Part 1 >>>Focus on partition 1

Detail Part >>>Show its details

== Repeat the last 2 commands for each partition on disk 0 ==

Exit >>>Leave DiskPart

Here is mine...

C:\WINDOWS\system32>DiskPart

Microsoft DiskPart version 10.0.19041.964

Copyright (C) Microsoft Corporation.

On computer: PCRSCOMPUTER

DISKPART> List Vol

Volume ### Ltr Label Fs Type Size Status Info

---

Volume 0 D DVD-ROM 0 B No Media

Volume 1 C PCR Hard NTFS Partition 930 GB Healthy Boot

Volume 2 ESP FAT32 Partition 99 MB Healthy System

Volume 3 WinRE 21H2 NTFS Partition 847 MB Healthy Hidden

DISKPART> List Disk

Disk ### Status Size Free Dyn Gpt

---

Disk 0 Online 931 GB 2048 KB *

DISKPART> Select Disk 0

Disk 0 is now the selected disk.

DISKPART> List Part

Partition ### Type Size Offset

---

Partition 1 System 99 MB 32 KB

Partition 2 Reserved 16 MB 100 MB

Partition 3 Primary 930 GB 116 MB

Partition 4 Recovery 847 MB 930 GB

DISKPART> Select Part 1

Partition 1 is now the selected partition.

DISKPART> Detail Part

Partition 1

Type : c12a7328-f81f-11d2-ba4b-00a0c93ec93b <<<EFI

Hidden : Yes

Required: No

Attrib : 0X8000000000000000

Offset in Bytes: 32768

Volume ### Ltr Label Fs Type Size Status Info

---

* Volume 2 ESP FAT32 Partition 99 MB Healthy System

DISKPART> Select Part 2

Partition 2 is now the selected partition.

DISKPART> Detail Part

Partition 2

Type : e3c9e316-0b5c-4db8-817d-f92df00215ae <<<MSR

Hidden : Yes

Required: No

Attrib : 0X8000000000000000

Offset in Bytes: 104889856

There is no volume associated with this partition.

DISKPART> Select Part 3

Partition 3 is now the selected partition.

DISKPART> Detail Part

Partition 3

Type : ebd0a0a2-b9e5-4433-87c0-68b6b72699c7 <<<Windows

Hidden : No

Required: No

Attrib : 0000000000000000

Offset in Bytes: 121667072

Volume ### Ltr Label Fs Type Size Status Info

---

* Volume 1 C PCR Hard NTFS Partition 930 GB Healthy Boot

DISKPART> Select Part 4

Partition 4 is now the selected partition.

DISKPART> Detail Part

Partition 4

Type : de94bba4-06d1-4d40-a16a-bfd50179d6ac <<<Recovery

Hidden : Yes

Required: Yes

Attrib : 0X8000000000000001

Offset in Bytes: 999313944576

Volume ### Ltr Label Fs Type Size Status Info

---

* Volume 3 WinRE 21H2 NTFS Partition 847 MB Healthy Hidden

DISKPART> Exit

Leaving DiskPart...