Not often I look in disk management, but now I see that I have an unallocated partition on my SSD.
I am certain that in the past there was not such a thing.
My question is what might be a possible reason that such a partition develops?
Can you post a screen shot of your disk management window.
It looks like it used to be a manufacturer's recovery partition at one time. It could also have been left unallocated for overprovisioning and when you did a Windows upgrade, the upgrade process stuck a new recovery partition at the end of the drive. I would delete the first recovery partition, then expand C: drive into the resulting consolidated free space, then if needed fix the Windows recovery environment with the reagentc /setreimage command.
I recommend for less experienced users to use MiniTool Partition Wizard Free:
MiniTool Free Partition Manager for Window 8/7/vista/xp | Partition Wizard Free Edition
The reason is that it will let you delete, move and expand partitions in ways that Windows either won't do, or will complain about doing. You would right click on the recovery partition to the right of your C: drive partition and delete it. Then resize the C: drive partition to fill all the empty space that gets created next to it. Don't forget to click apply in Partition Manager.
After that, restart the computer. Then open a Command Prompt (admin) or Powershell (Admin) and run the command:
reagentc /info
that will tell us if you need to reset your Advanced Recovery options menu. Even if we can't reset it, there is very little that you lose, everything on that menu (you get that menu holding down shift when you click on restart on the power button icon) can also be found by booting from a Windows 10 installation USB flash drive or DVD.
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