Describes the cause and action for error messages.
cannot allocate partition
Cannot extend un-allocated space Solved - Windows 10 Forums
How to Fix Can't Access a Partition in Windows (Works Great in 2019)
Solved - New Simple Volume Greyed out in Disk Management
Solution to Unallocated Space Cannot Create Partition
Fixed: Unallocated Space on 4TB Hard Drive that Shows up Only 2TB
hard drive - Why is windows not able to create a system partition ...
Why can I not allocate space on my hard drive? - MakeUseOf
How to Delete an Unallocated Partition - YouTube