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//0x4 bytes (sizeof)
union _PNP_REBALANCE_FLAGS
{
    struct
    {
        ULONG RebalanceDueToDynamicPartitioning:1;                          //0x0
        ULONG ResetDeviceWhileStopped:1;                                    //0x0
        ULONG Reserved:30;                                                  //0x0
    } u;                                                                    //0x0
    ULONG AsUlong;                                                          //0x0
};