#define STATUS_FLT_DISALLOW_FAST_IO ((NTSTATUS)0xC01C0004L)
MessageId: STATUS_FLT_DISALLOW_FAST_IO MessageText: Internal error code used by the filter manager to determine if a fastio operation should be forced down the IRP path. Mini-filters should never return this value.
Translation macro for converting: HRESULT --> NTSTATUS