Moving or recreating EFI partiton

After a recent upgrade to Win10 from Win8.1 I decided to add an new SSD as the primary disk and reinstall a fresh copy of Win10 to it.

I installed the new SSD and kept the old one in there as well. After the installation was complete and I was satisfied that I had everything from my OLD SSD I decided it was time to remove it. Now I have discovered that my PC is booting using the EFI partition on my old SSD and the new Win10 install did not create one on my new SSD. So I've had to keep the old SSD in there in order to boot.

How can I non-destructively create an EFI partition on my new SSD so I can remove the old one?
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Michael ChisholmCommented:
in my opinion before you do anything take a complete backup.

and since you have done that wiping it out and starting over wouldn't be that hard.  Restore your data and reinstall your applications
David Johnson, CD, MVPOwnerCommented:
What you didn't do was change the hard drive boot priority and boot from that hard drive. remove the old hard drive, boot from the installation media, in the setup process bring up a command prompt (f10 or shift-f10) run diskpart
while in diskpart
list disk
select disk x  replace X with the drive # from list disk
exit back to the setup and continue the setup.
i would redo it from fresh - but disconnect the old drive first
then everything will be ok during install
reconnect the old drive later !
you can also use the paragon migrate OS to SSD :

another option is to disconnect the old disk - then boot from the paragon rescue kit, and use the boot corrector tool :
Acronis True Image 2019 just released!

Create a reliable backup. Make sure you always have dependable copies of your data so you can restore your entire system or individual files.

noxchoGlobal Support CoordinatorCommented:
What partition did it create then during new install? only C:?
In any case - if you decide to install Windows 10 from scratch then it is a good idea. But before you do this - disconnect the old SSD or change at least their priority in BIOS.
Manually creating partitions will bring you only headaches.
Michael ChisholmCommented:
In order to keep a stable machine and not question the system every time you have the slightest anomaly

in my opinion before you do anything take a complete backup.

and since you have done that wiping it out and starting over wouldn't be that hard.  Restore your data and reinstall your application.

Starting the system over is your best bet to get a solid platform.

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LikkieAuthor Commented:
Hi All,

Thank-you everyone for your comments.  I think I'll erase and reinstall fresh with the old SSD disconnected.

As a matter of interest I had moved the original SSD to a different SATA connection (slower, as I wanted the new SSD on the fastest) and changed the Boot Order in BIOS before booting from the USB stick with the installer on it.  

I thought the new install would create all of the necessary partitions on the new SSD but it didn't.


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