Describes the cause and action for error messages.
cannot use unallocated space
Unallocated Space Error Windows 10 | Tom's Hardware Forum
Can't partition unallocated space on my 1tb HDD.
Can't partition unallocated space on 3TB hard drive.
Can't "Extend" Drive C: to use "Unallocated" Space - YouTube
ssd - Windows 10 unable to re-allocate Unallocated space - Super User
windows 10 - Unallocated space Disk 0 to Disk 1
windows 10 - Drive0 Unallocated Space
windows 10 - How to extend C: drive to claim ...