cloned C: drive locked and unbootable Windows 10

Liefr used Ask the Experts™
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.
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Top Expert 2013
if you imaged the bad OS to another disk - it is normal it does not work
you have to repair that first
you can try the boot corrector tool from the paragon rescuee kit :      

i would run a diag on the 2 TB drive -  i use ubcd for this, see below :
then it can help running the HDDregenerator, it fixed many drives for me      
Hardware diagnostic CD    UBCD

go to the download page, scroll down to the mirror section, and  click on a mirror to start the download
Download the UBCD and make the cd   <<==on a WORKING PC, and boot the problem PC from it
Here 2 links, one to the general site, and a direct link to the download

since the downloaded file is an ISO file, eg ubcd527.iso - so you need to use an ISO burning tool
if you don't have that software, install cdburnerXP :

If you want also the Ram tested - run memtest86+ at least 1 full pass,  - you should have NO errors!
For disk Diagnostics run the disk diag for your disk brand (eg seagate diag for seagate drive)  from the HDD section -  long or advanced diag !  (runs at least for30 minutes)                        ultimate boot cd             download page

**  you can make a bootable cd - or bootable usb stick

for completeness -here's how i handle disk problems :
Hi nobus, Thanks for those great ideas.

I was reading a thread earlier about migrating to an SSD and was pointed to Paragon software.
This tool;  does exactly what I need.

I know this because earlier this evening I bought it ($20) and ran it and it works perfectly the first time with my GPT disks.

I just re-cloned over my previous one choosing to make the boot records.
It still made a recovery partition and an EFI partition and I do not know why but who cares. They are tiny relative to my 3tb drive.

I am over the moon. Days of work done in 3 hrs with the right software.

Closing this out.
Thanks again for your thoughts on this.

noxchoIT Product Manager
Top Expert 2009

Your problem was that cloning C: partition is not enough. It can boot only if boot files are also on C: but they are normally in MSR or EFI partition (depending on which type of HDD you use - GPT or MBR).
Using Migrate OS to SSD which automatically clones this partition additionally to C: - solved your problem.
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Top Expert 2013

tx for the kind words, and enjoy


All of nobus' comments were great and useful but not necessary for this problem. I gave him most of the points anyway for sharing his knowledge. The Paragon software handled it in one run. EE always comes through.
Top Expert 2013

tx for feedback

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