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VDS_E_FORMAT_CRITICAL
VDS format methods explicitly deny formatting volumes used by the running system for system, boot, crash-dump, hibernation, or pagefile roles. This is a role protection, not a failure to recognize the file system and not an allocation-unit-size problem. Format force options concern in-use formatting behavior; they do not make a critical Windows volume safe to erase.
Why this state matters
The first diagnostic task is to identify the current role of the target volume and its containing disk. Because one disk can host multiple volumes, disk flags alone should be correlated with the selected volume and its extent mapping. A drive letter is not a reliable role indicator: critical volumes may be hidden or mounted differently, and ordinary data volumes can use familiar letters.
Diagnostic focus
- Log the VDS volume ID, containing disk IDs, and current disk role flags before formatting.
- Record the requested file-system type and formatting method, but treat the critical-role gate as the primary failure.
- Do not retry with a stronger force option; move the operation to a supported offline/recovery workflow if the volume must be repurposed.
- Reacquire storage state after reboot or booting another environment before issuing the format again.
Technical references
IVdsVolumeMF::Format · IVdsVolumeMF2::FormatEx · IVdsVolumeMF3::FormatEx2 · VDS_DISK_FLAG · MS-VDS error codes
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