We help IT Professionals succeed at work.
Get Started

cloned C: drive locked and unbootable Windows 10

Liefr asked
Last Modified: 2015-08-23
I bought the computer with Windows 8.1 Pro. I requested and then upgraded to Windows 10 Pro. I began having 'error 1962: OS not found,,,' intermittently. The drive is a 2tb Seagate drive. There are 6 partitions on the drive from Lenovo and Windows is #4.

I cloned the C: partition into a new Seagate 3tb drive. That left me with 2tb + the leftover unallocated. I combined the two pieces in disk management to make one large partition with only the C: partition from the old drive.

It is not bootable. I get error 1962: OS not found when I try to boot from it. The drive appears to be locked. I used cmd.exe as administrator and ran diskpart and volume commands and the drive is not read-only or otherwise restricted. I have tried Bootsect and Bootrec with /fixmbr; /fixboot; /rebuildBCD commands but no success. I suspect it is because the big drive is GPT instead of MBR.

I have the Win 10 upgrade on DVD and tried refresh but it says the drive is locked. I have done the boot diagnosis but it tries to fix it without telling you what it is doing and in any case it does not fix it.

I think my problems are based in trying to get away from the extra partitions that are no good anymore and also that I am using GPT instead of MBR. I think the old bootmgr is looking for partition 4 and I am unable to change it's mind.

If anyone has an idea I would like to hear it.
Watch Question
This problem has been solved!
Unlock 2 Answers and 6 Comments.
See Answers
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE