When connecting a Dahua-formatted disk, Windows may flag it as an unformatted partition and prompt a formatting warning. Windows does not recognize the custom partition table. Ignore the operating system prompt entirely, open the dedicated application tool, and let the software handle partition mapping safely.
If you meant the or a specific software download named exactly "Dahua Disk Manager" for PC, please clarify and I can provide the correct command-line usage or download reference.
If you need help setting up your surveillance storage system, please share: The of your Dahua recorder (NVR or XVR). The operating system version you run on your playback PC.