typedef struct REPORT_LUNS_LOGICAL_UNIT_ADDRESSING { 
    #ifdef __LITTLE_ENDIAN__ 
    UInt16 LUN : 5; 
    UInt16 BUS_NUMBER : 3; 
    UInt16 TARGET : 6; 
    UInt16 reserved2 : 1; 
    UInt16 reserved : 1; 
    #else /* !__LITTLE_ENDIAN__ */
    UInt16 reserved : 1; 
    UInt16 reserved2 : 1; 
    UInt16 TARGET : 6; 
    UInt16 BUS_NUMBER : 3; 
    UInt16 LUN : 5; 
    #endif 
    /* !__LITTLE_ENDIAN__ */
} REPORT_LUNS_LOGICAL_UNIT_ADDRESSING;  

typedef struct REPORT_LUNS_PERIPHERAL_DEVICE_ADDRESSING { 
    #ifdef __LITTLE_ENDIAN__ 
    UInt16 TARGET_LUN : 8; 
    UInt16 BUS_IDENTIFIER : 6; 
    UInt16 reserved2 : 1; 
    UInt16 reserved : 1; 
    #else /* !__LITTLE_ENDIAN__ */
    UInt16 reserved : 1; 
    UInt16 reserved2 : 1; 
    UInt16 BUS_IDENTIFIER : 6; 
    UInt16 TARGET_LUN : 8; 
    #endif 
    /* !__LITTLE_ENDIAN__ */
} REPORT_LUNS_PERIPHERAL_DEVICE_ADDRESSING;  

typedef struct SCSICmd_REPORT_LUNS_LUN_ENTRY { 
    UInt16 FIRST_LEVEL_ADDRESSING; 
    UInt16 SECOND_LEVEL_ADDRESSING; 
    UInt16 THIRD_LEVEL_ADDRESSING; 
    UInt16 FOURTH_LEVEL_ADDRESSING; 
} SCSICmd_REPORT_LUNS_LUN_ENTRY;  

typedef struct SCSICmd_REPORT_LUNS_Header { 
    UInt32 LUN_LIST_LENGTH; // LUN list length in bytes. 
    UInt32 RESERVED; 
    SCSICmd_REPORT_LUNS_LUN_ENTRY LUN[1]; // Variable length list. Must have at least LUN 0 if 
} SCSICmd_REPORT_LUNS_Header;  // Target supports REPORT_LUNS command. 

enum { 
    kREPORT_LUNS_ADDRESS_METHOD_PERIPHERAL_DEVICE = 0, 
    kREPORT_LUNS_ADDRESS_DEVICE_TYPE_SPECIFIC = 1, 
    kREPORT_LUNS_ADDRESS_METHOD_LOGICAL_UNIT = 2, 
    // Reserved [3] 
    kREPORT_LUNS_ADDRESS_METHOD_OFFSET = 14 
};  

#define kREPORT_LUNS_HeaderSize 8