Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

Windows 10 in BC needs repair

Killerbob

Killerbob

macrumors 68000
Original poster
Jan 25, 2008
1,925
677
I have a "Windows 10 Pro" Boot Camp installation on my Mac Pro, which I unfortunately need for work. I installed it last year and it has been working just fine until today. There was an update of sorts, and now I can't boot into Windows.

As soon as the Windows boot is going, I get a BSOD;

Recovery
Your PC/Device needs to be repaired
The Boot Configuration Data for your PC is missing or contains errors

File: \EFI\Microsoft\Boot\BCD
Error code: 0x000000f​

What do I do to fix this? I have a USB stick with Windows 10 installation files, created using BootCamp Assistant from an ISO file.
 
Killerbob said:
What do I do to fix this? I have a USB stick with Windows 10 installation files, created using BootCamp Assistant from an ISO file.
Click to expand...

Sounds like a Windows update failed part way through, leaving the system in an unusable state.

Boot the install media, go the repair section, advanced, and roll back to the last system restore point.
 
I tried that, and nothing worked.

I eventually made a WinClone of the BootCamp partition, blew away the partition, and went back to "all Mac". Then I connected an external ThunderBolt SSD and put the WinClone image onto it. This I can now use from Parallels and can run Windows 10. I can't however, make that show up as a boot disk when rebooting the Mac.

It works as a Parallels media, but NOT as a BootCamp partition.

If someone could tell how to make that work, I'd be a happy camper....
 
Is that something new since Windows 10?

I had it working just fine with Windows 8.1, installed on a proper Boot Camp partition, then copied using WinClone, and restored on an external LaCie Thunderbolt SSD.

This worked fine for a long time, I only moved the Boot Camp internally since I upgraded to Windows 10.
 
Killerbob said:
I have a "Windows 10 Pro" Boot Camp installation on my Mac Pro, which I unfortunately need for work. I installed it last year and it has been working just fine until today. There was an update of sorts, and now I can't boot into Windows.

As soon as the Windows boot is going, I get a BSOD;

Recovery
Your PC/Device needs to be repaired
The Boot Configuration Data for your PC is missing or contains errors

File: \EFI\Microsoft\Boot\BCD
Error code: 0x000000f​

What do I do to fix this? I have a USB stick with Windows 10 installation files, created using BootCamp Assistant from an ISO file.
Click to expand...
No help I'm afraid, but I have the exact same problem!
 
Is there no way of doing a boot repair on Bootcamp? I really don't want to recreate all my Windows stuff. I can see all my files!
 
imacken said:
Is there no way of doing a boot repair on Bootcamp? I really don't want to recreate all my Windows stuff. I can see all my files!
Click to expand...

Boot to your recovery partition, recovery disk, or installation media, then run the repair option.
 
ActionableMango said:
Windows won't boot from an external drive.

You can try this solution for working around that limitation, but I have no experience with it:
http://superuser.com/questions/982577/how-to-run-windows-10-from-an-external-hard-drive
Click to expand...
Killerbob said:
Is that something new since Windows 10?

I had it working just fine with Windows 8.1, installed on a proper Boot Camp partition, then copied using WinClone, and restored on an external LaCie Thunderbolt SSD.

This worked fine for a long time, I only moved the Boot Camp internally since I upgraded to Windows 10.
Click to expand...

I can't offer any help with your predicament but I thought it's important to mention that Windows 10 has no problem being installed on an external drive with Thunderbolt. No hacks needed as it your sees your thunderbolt drive as internal. It's been like this since Thunderbolt was introduced.
 
  • Like
Reactions: ActionableMango
MRxROBOT said:
No hacks needed as it your sees your thunderbolt drive as internal. It's been like this since Thunderbolt was introduced.
Click to expand...

And that's exactly as I thought. I do not think I have a 2Windows on external drive" problem, but rather a BootCamp problem. I just don't how to solve it...
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom
Back