Solved Missing Boot manager

dannys22

Thread Starter
Joined
Apr 6, 2021
Messages
59
Well... Somehow I did it I guess. After successfully cloning my M.2 drive to my new NVMe drive and booted the system Ok Then I increased the volume of the C drive for maximum use. After a reboot I can't boot the drive any more. In the BIOS the boot sequence don't list the Windows Boot Manger for the drive. How can I rebuild or get it back?
THANKS for the help.
Danny
 
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dannys22

Thread Starter
Joined
Apr 6, 2021
Messages
59
The clone worked and I was able to boot from it. Then I expanded the volume and that's where I lost the Windows boot manager.
When I look at the BIOS, it list the correct drive maker, WD, and size, 1tb, but it's not listed as the Boot drive.
When I expanded the volume, it appears it either wiped it out or something.
Can the windows boot manger be rebuilt or how can I get it back? Will it happen again if I re-clone and expand the volume again?
Can I re-clone he drive with the partitions that are already in place or do I need to start over with a blank NVMe drive?
THANKS for the help.
Danny
 
Joined
Mar 30, 2014
Messages
4,766
  1. Re-clone the M.2 to the NVMe.
  2. Set the computer to boot from the NVMe.
  3. Boot Windows from the NVMe.
  4. Tap the [Winkey], type in diskmgmt.msc and press [Enter].
  5. Post a screenshot.
 

dannys22

Thread Starter
Joined
Apr 6, 2021
Messages
59
  1. Re-clone the M.2 to the NVMe.
  2. Set the computer to boot from the NVMe.
  3. Boot Windows from the NVMe.
  4. Tap the [Winkey], type in diskmgmt.msc and press [Enter].
  5. Post a screenshot.
Here's shot with the NVMe drive in the USB enclosure from Diskmgmt.
Should I clone a blank disk or cover the present condition?
Thanks
Danny
 

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crjdriver

Moderator
Joined
Jan 2, 2001
Messages
43,855
You can try repairing the boot files. Boot with a win10 install usb and choose Repair Computer option > Troubleshoot > Advanced Options > Command Prompt. Once at the command prompt, type the following;
Type BOOTREC /FIXMBR and hit <Enter>
Next, type BOOTREC /FIXBOOT then hit <Enter>
If you are still not successful, the attempt to rebuild the boot sector. Type the following;
bootrec /RebuildBcd and hit enter.

If that does not fix the problem, either attempt another image/clone OR just clean install windows.
 

dannys22

Thread Starter
Joined
Apr 6, 2021
Messages
59
You can try repairing the boot files. Boot with a win10 install usb and choose Repair Computer option > Troubleshoot > Advanced Options > Command Prompt. Once at the command prompt, type the following;
Type BOOTREC /FIXMBR and hit <Enter>
Next, type BOOTREC /FIXBOOT then hit <Enter>
If you are still not successful, the attempt to rebuild the boot sector. Type the following;
bootrec /RebuildBcd and hit enter.

If that does not fix the problem, either attempt another image/clone OR just clean install windows.
Thanks. If I do another clone should I start with a blank disk or go over what's done already.
Danny
You can try repairing the boot files. Boot with a win10 install usb and choose Repair Computer option > Troubleshoot > Advanced Options > Command Prompt. Once at the command prompt, type the following;
Type BOOTREC /FIXMBR and hit <Enter>
Next, type BOOTREC /FIXBOOT then hit <Enter>
If you are still not successful, the attempt to rebuild the boot sector. Type the following;
bootrec /RebuildBcd and hit enter.

If that does not fix the problem, either attempt another image/clone OR just clean install windows.
SUCCESS! THANKS. Here's the results of your instructions and a screen shot the disk management
Results

Bootrec/fixmbr
Completed successfully
Bootrec/fixboot
Access denied
Bootrec/rebuildbcd
Successfully scan installation: 1
D:\windows
Add installation to boot list Yes(Y) No (N) All (A) Y
The requested system device can not be found.

The BIOS now shows the windows boot master on the 1tb NVMe drive correctly I reboot and system boot normally.
THANKS AGAIN for the help.
Danny
 

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crjdriver

Moderator
Joined
Jan 2, 2001
Messages
43,855
You are welcome. Once this drive has booted successfully a few times, I would make a backup image of the drive [in case you have more problems in the future]
I am going to mark this as solved.
 

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