diff --git a/include/dto/comm_big_data_test.h b/include/dto/comm_big_data_test.h
index c3a2a20..12058d7 100644
--- a/include/dto/comm_big_data_test.h
+++ b/include/dto/comm_big_data_test.h
@@ -2,7 +2,7 @@
 #define COMM_BIG_DATA_TEST_H  
 #include <cstdint>
 #include "../enum/icd_id.h"
-#define MAX_SIZE (900 * 1024)  // 900KB
+#define MAX_SIZE (6*1024*1024 + 512*1024)  // 6.5MB
 #pragma pack(push, 1)
 struct CommBigDataTest {
   IcdId message_id;
diff --git a/include/enum/device_id.h b/include/enum/device_id.h
index 2007b65..c00f54e 100644
--- a/include/enum/device_id.h
+++ b/include/enum/device_id.h
@@ -3,7 +3,7 @@
 
 #include <cstdint>
 
-static constexpr uint8_t DEVICE_COUNT = 9;
+static constexpr uint8_t DEVICE_COUNT = 8;
 
 enum class DeviceId : uint8_t {
   GCU = 0x00,    // 유도조종장치
@@ -14,7 +14,7 @@ enum class DeviceId : uint8_t {
   HILS = 0x05,   // HILS 장치
   TEST1 = 0x06,  // 테스트 장치 1
   TEST2 = 0x07,  // 테스트 장치 2
-  INVALID = 0x08 // 유효하지 않은 장치 ID
+  INVALID = 0xFF // 유효하지 않은 장치 ID
 };
 
 #endif // DEVICE_ID_H