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//0x4 bytes (sizeof)
struct _PRIVATE_CACHE_MAP_FLAGS
{
    ULONG DontUse:16;                                                       //0x0
    ULONG ReadAheadActive:1;                                                //0x0
    ULONG ReadAheadEnabled:1;                                               //0x0
    ULONG Available:14;                                                     //0x0
};