Deleted boot partition

paul_53 · May 10, 2024

I don’t know how I’ve managed this but somehow I’ve managed to delete the boot partition and obviously now Windows won’t boot up. I’ve tried using the installation disc to do a repair but that doesn’t work. I’ve tried all of the options. The only one I haven’t used is the cmd prompt option but to be honest I wouldn’t know what to do with that anyway.

The actual windows installation is still on the machine and I was wondering if I can rebuild the boot partition from that.

I know I could do a fresh install but I’m hoping that is a last resort. That part isn’t the problem it’s the fact that I have Microsoft Flight Simulator installed (albeit on a separate drive). That takes hours to put back on.

Hopefully there is a solution. Any help on this will greatly appreciated

Thanks Paul

zbook · May 10, 2024

Boot to the Media Creation Tool (MCT) (Windows 11 iso) > command prompt > type:

diskpart
lis dis
lis vol
sel dis 0
det dis
lis par
sel dis 1
det dis
lis par

Post images or share links.

zbook · May 10, 2024

diskpart
sel dis V (change V to the disk # for the Windows disk)
sel par W (change W to the windows partition #)
shrink desired=100
create par EFI
format fs=fat32 label="EFI"
assign letter=T
exit

bcdboot C:\Windows /s T: /f UEFI

(sometimes in Windows RE the Windows drive may have letter D: then use command bcdboot D:\Windows /s T: /f UEFI)

Reboot

(Had waited for your reply to post #2)
(Heading to bed)

Post images or share links displaying disk management:

How to Post a Screenshot of Disk Management

How to Post a Screenshot of Disk Management at Ten Forums

www.tenforums.com

FreeBooter · May 10, 2024

The Bcdedit | find "osdevice" command can be used to find out the drive letter of the Windows installed partition, the output of the Bcdedit command is similar to this osdevice partition=D:. The drive letter after partition= is the drive letter of the Windows partition.

paul_53 · May 10, 2024

Thank you all for responding so quickly. I realised after I had posted that I hadn’t detailed the drives so here goes:-

1gb nvme drive for windows
2gb nvme drive for MSFS 2020
2gb Samsung ssd drive for flight simulator stuff
2gb Samsung drive for anything else

I’ve attached a screenshot of some of the results after following the first posters instructions and I’m wondering if my build has any bearing on the the instructions.

Sorry to be such a numpty but there’s only so much my old head can cope with

Fabler2 · May 10, 2024

This is also a good guide that you can follow at your leisure if needed,

How to Repair Windows 11 UEFI Bootloader [Full Guide]

What to do when you upgraded to Windows 11 but are not able to enable UEFI and convert from MBR to GPT? Here is an ultimate guide that allows you to convert without data loss, and enable UEFI using Advanced Recovery.

www.easeus.com

paul_53 · May 10, 2024

I’ve attached a photo of the windows disc and partitions

cereberus · May 10, 2024

On another pc, install Macrium Reflect (trial version will be adequate).

Create a Macrium Rescue usb flash drive

Boot from it and select link "fix windows boot problems"

paul_53 · May 10, 2024

Unfortunately I haven’t got access to another pc

SIW2 · May 10, 2024

I think you mean the System partition.

If you have deleted it, then there should be unallocated space where it was previously.

You could create an esp ( aka system ) partition from that unallocated space and populate it using bcdboot command.

zbook · May 10, 2024

paul_53 said:
"somehow I’ve managed to delete the boot partition"

Power on the computer > post images or share links displaying any error messages or codes

Boot to the MCT > command prompt > type

Code:

bcdedit
bcdedit | find "osdevice"
diskpart
sel dis 2
det dis
lis par
sel par 1
det par
sel par 2
det par
sel par 3
det par
sel par 4
det par

Post images or share links.

x BlueRobot · May 10, 2024

SIW2 said:
If you have deleted it, then there should be unallocated space where it was previously.

It looks like their ESP partition still exists, I should imagine they've somehow corrupted their BCD store.

@paul_53 What does output does the following command produce?

Code:

bcdedit /enum

paul_53 · May 10, 2024

zbook, I followed your instruction and Windows now boots up and I have a boot file where the old one was thank you very much

I now have an old problem back though

I can hear windows boot up with its annoying little tune, but all I have is a black screen? If I restart the pc and go into the MB settings and restart from there its fine?? What I noticed is that the lights on the flightstick will come on then flash off then back on, thats when I know I'm going to get the black screen?

zbook · May 10, 2024

See what happens in safe mode:

Boot to Safe Mode in Windows 11 Tutorial

This tutorial will show you how to boot Windows 11 into normal mode, Safe Mode, Safe Mode with Networking, or Safe Mode with Command Prompt. Safe mode starts Windows in a basic state, using a limited set of files and drivers. If a problem doesn't happen in safe mode, this means that default...

www.elevenforum.com