Formatting disc for Win 10 installation. What about Unallocated Space?

Version 1909 (OS Build 18363.1440)

I have removed an SSD disk from a laptop, in order to format it and place it to another laptop. Windows installation will follow.
Disc had a Primary Partition and a System Reserved Partition (100 Mb).
I connected it to my pc, as external drive, and formatted it. Apparently, only Primary Partition was formatted.
The System Reserved Partition was still there. I deleted it (right click>Delete Volume) but it seems that I only made it Unallocated Space.
So, what I see now, through Disk Management, is a Primary Partition and an Unallocated space (photo 1).
I tried to Merge the Unallocated space to the Primary Partition (right click>Extend Volume etc) but the message just before the procedure completes (photo 2), made me hesitate.

I remind you that the disc is going to be used as OS one.

What should I do?
Is there a way to bring the disc back to a brand-new condition?

Thanks





My pc runs Win 10 Pro Version 1909 (OS Build 18363.1440)

It is not necessary to format the disk drive removed from the laptop as it will become an unallocated disk drive during the new Windows installation.

When a clean install is performed there is a menu to highlight and delete partitions.
All partitions are deleted making an unallocated disk drive.
The Windows Media Creation Tool (MCT) (Windows iso) will install Windows on the unallocated disk drive.

Clean Install Windows 10


If you had had problems with the disk drive or if you want to make sure that a new user cannot recover any files with partition recovery software then you could use the clean all command. This writes 0 and 1 to each sector of the drive. This is extra ware and can be used when selling a computer.

Erase Disk using Diskpart Clean Command in Windows 10

Thanks for the answers!