helper.h

typedef struct _DRIVERSTATUS {
	UCHAR  bDriverError;
	UCHAR  bIDEError;
	UCHAR  bReserved[2];
	ULONG  dwReserved[2];
} DRIVERSTATUS, *PDRIVERSTATUS, *LPDRIVERSTATUS;

typedef struct _IDEREGS {
	UCHAR  bFeaturesReg;
	UCHAR  bSectorCountReg;
	UCHAR  bSectorNumberReg;
	UCHAR  bCylLowReg;
	UCHAR  bCylHighReg;
	UCHAR  bDriveHeadReg;
	UCHAR  bCommandReg;
	UCHAR  bReserved;
} IDEREGS, *PIDEREGS, *LPIDEREGS;

#define ATAPI_ID_CMD                      0xA1
#define ID_CMD                            0xEC
#define SMART_CMD                         0xB0

#include <pshpack1.h>
typedef struct _SENDCMDOUTPARAMS {
	ULONG  cBufferSize;
	DRIVERSTATUS  DriverStatus;
	UCHAR  bBuffer[1];
} SENDCMDOUTPARAMS, *PSENDCMDOUTPARAMS, *LPSENDCMDOUTPARAMS;

typedef struct _SENDCMDINPARAMS {
	ULONG  cBufferSize;
	IDEREGS  irDriveRegs;
	UCHAR  bDriveNumber;
	UCHAR  bReserved[3];
	ULONG  dwReserved[4];
	UCHAR  bBuffer[1];
} SENDCMDINPARAMS, *PSENDCMDINPARAMS, *LPSENDCMDINPARAMS;
#include <poppack.h>