_SENDCMDOUTPARAMS = packed record
    cBufferSize: DWORD;            // Size of bBuffer in bytes
    DriverStatus: DRIVERSTATUS;    // Driver status structure.
    bBuffer: array [0..0] of BYTE; // Buffer of arbitrary length in which to store the data read from the drive.
  end;
  ...
  _DRIVERSTATUS = packed record
    bDriverError: BYTE; // Error code from driver, or 0 if no error.
    bIDEError: BYTE;    // Contents of IDE Error register. Only valid when bDriverError is SMART_IDE_ERROR.
    bReserved: array [0..1] of BYTE;   // Reserved for future expansion.
    dwReserved: array [0..1] of DWORD; // Reserved for future expansion.
  end;