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http://topic.csdn.net/u/20100413/09/ffc0fcd5-c3c1-4a15-b5a2-f1bf65f50caa.html?21874
C/C++ code
typedef struct _VSCSIDISK_COMMON_DEVICE_EXTENSION
{
BOOLEAN IsPdo;
} VSCSIDISK_COMMON_DEVICE_EXTENSION, *PVSCSIDISK_COMMON_DEVICE_EXTENSION;

typedef struct _VSCSIDISK_PDO_DEVICE_EXTENSION
#ifdef __cplusplus
: VSCSIDISK_COMMON_DEVICE_EXTENSION
{
#else
{
VSCSIDISK_COMMON_DEVICE_EXTENSION;//ÕâÀïÔõÑùÀí½â£¿
#endif
ULONG DeviceId; // unique device id
} VSCSIDISK_PDO_DEVICE_EXTENSION, *PVSCSIDISK_PDO_DEVICE_EXTENSION;
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VSCSIDISK_PDO_DEVICE_EXTENSION x;
x.IsPdo = FALSE;
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VSCSIDISK_PDO_DEVICE_EXTENSION x;
x.a.IsPdo = FALSE;