How to properly unpack an R-Image system partition image?

Question

Windows

The main WIN10 system, I know that if there are two OSes on different partitions in the PC, when you turn it on, you are prompted to choose which one to boot from. I unpacked the RDR image of the old system partition (8.1) to a new partition, but when the laptop was turned on, an additional boot option did not appear. What did I do wrong?
Related question: Is it possible to unpack a system image, except for some pre-installed programs?

Answer 1

and in the boot section who will add the boot option with the indication of the system partition type?

Answer 2

How to properly unpack an R-Image system partition image?

Yes, as usual, unpacked and everything.

I unpacked the RDR image of the old system partition (8.1) to a new partition, but when the laptop was turned on, an additional boot option did not appear. What did I do wrong?

You did everything right, but why did you decide that the download should appear? You did not unpack the boot partition, but the system partition.
Recent versions of Windows keep the bootloader off the system partition.
It is necessary to copy the system and boot partitions to the archive so that such issues do not arise.
If you only have a system partition, then you will have to create a boot partition again, it is best to do this using the windows installation disk by running system restore.

Related question: Is it possible to unpack a system image, except for some pre-installed programs?

No. An image is an image, it is loaded onto disk as is. And then delete what you don't need.

Answer 3

If you only have a system partition, then you will have to create a boot partition again, it is best to do this using the windows installation disk by running system restore.

Thanks for the detailed answer! Now I have a new system, and only the image of the system partition remains from the old one, as well as the same image, but unpacked to one of the new disk partitions, apparently. as you noticed, no boot partition. Could you be more specific in pointing me to further steps in order to be able to boot from the partition to which I unpacked the system partition with the old OS? The article provided by the user oia describes various manipulations for editing the boot disk, and the examples are given with the expectation of an experienced user. I also need an algorithm of actions that will help in my case.