diff --git a/src/SmartArrayControllerTool.cpp b/src/SmartArrayControllerTool.cpp
index ca495b4..fe2062d 100644
--- a/src/SmartArrayControllerTool.cpp
+++ b/src/SmartArrayControllerTool.cpp
@@ -139,18 +139,24 @@ int wmain(int argc, wchar_t* argv[])
 	sptwb.spt.Cdb[0] = 0x26;
 	sptwb.spt.Cdb[6] = 0x11;
 
-	unsigned short bebufsize = htons(sizeof(id_ctlr));
-	memcpy(&sptwb.spt.Cdb[7], &bebufsize, 2);
+	const unsigned short reqSize = htons(sizeof(id_ctlr));
+	memcpy(&sptwb.spt.Cdb[7], &reqSize, 2);
 
 	length = offsetof(SCSI_PASS_THROUGH_WITH_BUFFERS, ucDataBuf) + sptwb.spt.DataTransferLength;
 
+	std::wcout << std::dec
+		<< L"Total struct size: " << sizeof(SCSI_PASS_THROUGH_WITH_BUFFERS)
+		<< L", Calculated length: " << length
+		<< L", Header length: " << sptwb.spt.Length
+		<< std::endl;
+
 	BOOL ret = DeviceIoControl(
 		handle,
 		IOCTL_SCSI_PASS_THROUGH,
 		&sptwb,
 		sizeof(SCSI_PASS_THROUGH) + sptwb.spt.SenseInfoLength,
 		&sptwb,
-		sizeof(SCSI_PASS_THROUGH_WITH_BUFFERS),
+		length,
 		&returned,
 		NULL
 	);
@@ -261,4 +267,4 @@ int wmain(int argc, wchar_t* argv[])
 #endif
 
 	CloseHandle(handle);
-	}
+		}