C:\boot missing

NavyLCDR said:

In your command prompt, run the following commands. If any of the commands fail, stop and post which one failed:
diskpart
sel dis 0
sel par 1
del par override
cre par EFI
for fs=FAT32 quick
assign letter=T
exit
bcdboot C:\Windows /s T: /f ALL
exit

Then reboot the computer.

Yes you are the man.. This worked for me, after over 8hrs of scouring the internet for a solution.

NavyLCDR said:

In your command prompt, run the following commands. If any of the commands fail, stop and post which one failed:
diskpart
sel dis 0
sel par 1
del par override
cre par EFI
for fs=FAT32 quick
assign letter=T
exit
bcdboot C:\Windows /s T: /f ALL
exit

Then reboot the computer.

Thank you so much for your answer, had been surfing the web for hours, finally working, thank you very much

My Sony laptop will not boot from a USB, none of the command prompt stuff worked above. please help! It won't load in safe mode, restore does not work. just have BAD_SYSTEM_CONFIG_INFO to go off of.

I followed these steps exactly, and when I got to the "bcdboot C:\Windows /s T: /f ALL" step, cmd printed the following:

"Failure when attempting to copy boot files."

NavyLCDR said:

In your command prompt, run the following commands. If any of the commands fail, stop and post which one failed:
diskpart
sel dis 0
sel par 1
del par override
cre par EFI
for fs=FAT32 quick
assign letter=T
exit
bcdboot C:\Windows /s T: /f ALL
exit

Then reboot the computer.

NavyLCDR said:

In your command prompt, run the following commands. If any of the commands fail, stop and post which one failed:
diskpart
sel dis 0
sel par 1
del par override
cre par EFI
for fs=FAT32 quick
assign letter=T
exit
bcdboot C:\Windows /s T: /f ALL
exit

Then reboot the computer.

tried this and it might have made things worse haha. Before I was able to use command prompt and at least got a blue screen. Now it says no boot device found. Any help? TIA

@japsmaf, @aceman,

The commands given are not universal. They were written for a very specific drive and partition layout. They only applied, as written, to a computer booting in UEFI mode with the first drive, disk 0, as the system drive, with partition 1 as the system partition, and the Windows partition assigned the drive letter C:. Any variation in any one of those variables and you would have to modify the commands to match your computers layout.

"Failure when attempting to copy boot files." indicates that in your command prompt, the Windows partition is not assigned to drive letter C:.

"no boot device found" indicates that your computer is trying to boot with a legacy BIOS or in the CSM mode of UEFI.

NavyLCDR said:

@japsmaf, @aceman,

The commands given are not universal. They were written for a very specific drive and partition layout. They only applied, as written, to a computer booting in UEFI mode with the first drive, disk 0, as the system drive, with partition 1 as the system partition, and the Windows partition assigned the drive letter C:. Any variation in any one of those variables and you would have to modify the commands to match your computers layout.

"Failure when attempting to copy boot files." indicates that in your command prompt, the Windows partition is not assigned to drive letter C:.

"no boot device found" indicates that your computer is trying to boot with a legacy BIOS or in the CSM mode of UEFI.

I see, my mistake. Is there a way to undo what I did? I can't get into command prompt. Alternatively, I booted Ubuntu off a USB to see if I can access my files on my hard drive, move them onto an external, and do a fresh install of Windows, but I can't mount it for some reason. Is it because of the partition mistake? Thanks for your help.

NavyLCDR said:

@japsmaf, @aceman,

The commands given are not universal. They were written for a very specific drive and partition layout. They only applied, as written, to a computer booting in UEFI mode with the first drive, disk 0, as the system drive, with partition 1 as the system partition, and the Windows partition assigned the drive letter C:. Any variation in any one of those variables and you would have to modify the commands to match your computers layout.

"Failure when attempting to copy boot files." indicates that in your command prompt, the Windows partition is not assigned to drive letter C:.

"no boot device found" indicates that your computer is trying to boot with a legacy BIOS or in the CSM mode of UEFI.

Hey man I used your method but double checked beforehand and my disk 0 was the system drive and my WIN10 OS was assigned letter c but now my BIOS doesn't see my sata drive in the boot order anymore. Sorry to bother you but would you happen to have any ideas?

ohgodpleasehelp said:

Hey man I used your method but double checked beforehand and my disk 0 was the system drive and my WIN10 OS was assigned letter c but now my BIOS doesn't see my sata drive in the boot order anymore. Sorry to bother you but would you happen to have any ideas?

If your computer is booting in UEFI mode, then the system partition usually has to be FAT32. If your computer is booting in legacy BIOS (CSM) mode, the disk must be MBR partition type and the system partition must be marked as active. Also when writing the boot files using the bcdboot command, the correct option for /f must be specified: /f UEFI, /f BIOS, or /f ALL.