Drive 0 | Unallocated Space During Windows Installation

In simple terms, "Unallocated Space" is a portion of a physical hard drive that does not belong to a partition. Windows cannot store files or system data in unallocated space; it needs a structured partition (like a C: drive) formatted with a file system (like NTFS).

Windows automatically creates:

Here are the steps to resolve this issue: drive 0 unallocated space during windows installation