Windows 10: Accidentally formatted Windows EFI artition

I'm trying to dual-boot Arch Linux and Windows 10. While installing Arch Linux, I accidentally formatted the Windows EFI partition. Now GRUB (the bootloader I'm using for Arch) doesn't detect Windows and the Boot manager also doesn't show Windows. I tried copying everything from Windows/Boot back into the EFI partition but it doesn't solve the problem.

Do I have to reinstall Windows?

submitted by /u/friedcouch
[link] [comments]

:)

 

How To Format A Write Protected Flash Memory ?

¿You already tried this one?...

Run CMD


1. diskpart
2. list disk

Then in the 3º step, put the correct number of disk in the list for the usb flash (if it's listed in disk 3, then you'll have to write select disk 3).

2. select disk #
3. clean
4. create partition primary
5. select partition 1
6. active
7. format fs=fat32
8. assign
9. exit

with that commands you will format the flash drive in fat32, if you have a large drive you can select also "format fs=ntfs" in step 7.

good luck!

 

Clean install Windows 10, preserving the EFI partition

Assuming you've already have backup of this drive.
Saving the EFI partition might not be enough, The BCD might contain custom key(s) and WinRe.wim might contain the diagnostic software.

You can try to install Windows using dism command, leave everything else alone:

1. Boot up Windows Installation media. On first screen, Hold SHIFT+F10 to get command prompt.
2. Type: echo list disk | diskpart to identify the Windows OS drive letter, it might not be C. Also the drive letter of the installation media.
3. Format X drive: format X: /y /Q /FS:NTFS /V:WINDOWS where X is the drive letter of Windows found in step 2
4. Navigate to root folder of the installation media found in step 2, find out if sources\install.wim or sources\install.esd existed, use it on the next command,use install.esd if install.wim does not exist:
   dism /Get-WimInfo /WimFile:sources\install.wim ==> get index # of Windows edition you want to install and use it on the next command
   dism /Apply-Image /ImageFile:sources\install.wim /index:# /ApplyDir:X:\
   where X is the drive letter formatted in step 3 and # is the index for the Windows edition.
5. reboot

 

Impossilbe to format EFI in FAT32 using DISKPART

THks NavyLCDR ofr your prompt reply.

Maybe it was not clear in my description but I already did that....And it doesn't work....Installation won't start (step 02) and I get the following message from Windows Installer :
"Windows could not format the partition on disk 0. The error occured during the preparation of system volume.Error code: 0x80042425"

That's the starting point for me to play with DISKPART...and to try to format my "System" EFI partition into FAT32.
When I am launching the command "FILESYSTEM" on the "SYSTEM" partition (EFI type), I only got exFat,NTFS and RESF....No FAT32...I wonder what is going wrong there...