Windows 10: Windows 10 won't boot after installing Ubuntu to a different drive

What do you mean i seen the EFI partition at posted screenshot at post 9.

 

If Windows 10 installed HDD missing a EFI System Reserved partition you can create one by following below instructions.


Please boot your computer with Windows Installation Media and from Windows Recovery Environment start the Command Prompt.

From Command Prompt execute below commands one at a time:


Code: Diskpart List Disk Select Disk 0 List Partition Select Partition X Shrink desired=100 Create Partition EFI FORMAT FS=FAT32 LABEL="EFI" Assign Letter=W Exit bcdboot C:\Windows /s W: /f ALL[/quote] Use "List Disk" command to find out disk number assign to Windows 10 installed drive.

Replace number 0 zero with disk number assign to Windows 10 installed drive

Use "List Partition" command to find out Windows 10 installed partition assigned number.

Replace X letter with Windows 10 installed partition assigned number.

You may need to replace C: drive letter with Windows 10 installed partition drive letter.

I have to warn you Diskpart tool is very dangers so please make sure to execute Diskpart command carefully.

 

Look at post #10. The OP is trying to get Drive 1 in that screenshot to boot.

 

Weird in post #9 the Disk 1 have a EFI partition but not at post #10, any how i have posted instructions for the OP to follow to create a EFI System Reserved partition.

 

Thank you everyone for the help. Unfortunately, I'm not at home right now, so I can't try the fixes you guys recommended, but I expect to be back home tomorrow and will be trying them out.

It's because Disk 1 in post #9 is Disk 2 in post #10 which is the disk with the fresh Windows 10 install, running Partition Tool. The disk I'm trying to fix is Disk 1 in post #10, which was not showing in post #9 for some reason, and began to show later when I changed some BIOS options (to boot from UEFI Only).

 

1) See if you can find a camera or smart phone camera to take pictures of the display so that we can view the results in the thread.

2) Open the website for the computer or motherboard manufacturer > enter the model > select the operating system > view drivers > post a URL or hyperlink into the thread

3) Create a bootable Windows 10 iso:
Download Windows 10

 

He has an installer. He states he did a clean install to HDB in reply #9 *Smile

 

I'm finally back home. So, I created a 100mb FAT 32 partition on Disk 1, assigned the letter S and named it EFI with "Partition Tool", was about to use DiskPart to tranfers boot data to this new partition, but then I noticed that Disk 1 does not have a recovery partition as well. Should I create a "recovery" partition too? It's pretty easy to create partitions with this software, but am I going to be able to transfer recovery data the same way you guys suggested with DiskPart? If I won't able to transfer the recovery data, will Windows recognize it as the recovery partition and save new recovery data there? Thank you again.



Disk #1 with new EFI partition.

 

You don't need the recovery partition. Going from your screenshot in post #21, the next step would be to make the S: partition a true EFI System Partition. Open a Command Prompt (Admin) or "Run As Administrator" Command Prompt, and enter the following commands:

bcdboot D:\Windows /s S: /f ALL

If that is successful, continue in the same command prompt:
diskpart
select disk 0
list part
select part # <- replace # with the actual number of your EFI System Partition (S: drive)
remove letter=S
set id=c12a7328-f81f-11d2-ba4b-00a0c93ec93b
exit
exit

Now you should be good to go.

 

Did exactly what NavyLCDR said above and it's working again! Thank you everyone for helping me out, really appreciate! *Biggrin

 

Glad it worked! The missing recovery partition only gives you the menu functions of the advanced repair menu if you hold down the shift key and click on restart from the power button menu. That menu may very well be in a hidden Recovery folder on C: drive and still be functional. Even if it was in the recovery partition and is no longer there, you can get the same functions from booting from a Windows 10 USB flash drive and selecting the Repair options. I have custom Windows 10 installations on my computers, and none of them have the standard Windows 10 recovery partitions. My computers have second HDDs in them with a bootable partition that boots into Kyhi's Recovery Tools and also contains the standard Windows 10 installation files, so I have complete system recovery capabilities from the installed second HDD in case the primary SSD should fail or get corrupted.

 

I told ya, that man knows his stuff *Smile