Index: AlarmDefs.h
===================================================================
diff -u -r8a40366d0904d5e0700485c02757708cf9f13e57 -r5912d2cd18e412e3e8a48013954c9bea2e0b5362
--- AlarmDefs.h	(.../AlarmDefs.h)	(revision 8a40366d0904d5e0700485c02757708cf9f13e57)
+++ AlarmDefs.h	(.../AlarmDefs.h)	(revision 5912d2cd18e412e3e8a48013954c9bea2e0b5362)
@@ -339,6 +339,7 @@
     ALARM_ID_DG_PRIMARY_HEATER_POWER_VOLTAGE_OUT_OF_RANGE = 301,            ///< DG primary heater power voltage out of range
     ALARM_ID_DG_CPU_RAM_ERROR = 302,                                        ///< DG processor RAM error
     ALARM_ID_HD_SERVICE_TIME_INTERVAL_HAS_ELAPSED = 303,                    ///< HD service time interval has elapsed
+    ALARM_ID_HD_INVALID_USAGE_RECORD_CRC = 304,                             ///< HD invalid usage record
     NUM_OF_ALARM_IDS                                                        ///< Total number of alarms
 };
 typedef enum Alarm_List ALARM_ID_T;                                 ///< Type for alarm list enumeration
@@ -773,6 +774,7 @@
     { ALARM_PRIORITY_HIGH,     3,  FALSE, TRUE , TRUE , TRUE , TRUE , TRUE , FALSE, FALSE, FALSE, TRUE , FALSE, FALSE, ALARM_ID_DG_PRIMARY_HEATER_POWER_VOLTAGE_OUT_OF_RANGE,     0,              ALARM_ID_NO_ALARM },
     { ALARM_PRIORITY_HIGH,   999,  TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , FALSE, TRUE , FALSE, FALSE, ALARM_ID_DG_CPU_RAM_ERROR,                                 0,              ALARM_ID_NO_ALARM },
     { ALARM_PRIORITY_MEDIUM, 899,  FALSE, FALSE, TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , TRUE , FALSE, FALSE, ALARM_ID_HD_SERVICE_TIME_INTERVAL_HAS_ELAPSED,             0,              ALARM_ID_NO_ALARM },
+    { ALARM_PRIORITY_HIGH,     1,  FALSE, TRUE , TRUE , TRUE , TRUE , TRUE , FALSE, FALSE, FALSE, TRUE , FALSE, FALSE, ALARM_ID_HD_INVALID_USAGE_RECORD_CRC,                      0,              ALARM_ID_NO_ALARM },
 };  //   Priority            Rank  Fault DFault Stops  ClrIm  NoClr  NoRes  NoRin  NoEnd  NoBRcr NoDRcr ClrOnly TxLog  ID                                                        Escalate In     Escalate To
 
 /// Table of alarms and their rank.
@@ -819,6 +821,7 @@
     {   1, ALARM_ID_HD_RTC_OR_TIMER_ACCURACY_FAILURE },
     {   1, ALARM_ID_DG_DIALYSATE_FLOW_SENSOR_INVALID_CAL_RECORD },
     {   1, ALARM_ID_DG_RO_FLOW_SENSOR_INVALID_CAL_RECORD },
+    {   1, ALARM_ID_HD_INVALID_USAGE_RECORD_CRC },
     {   3, ALARM_ID_HD_INVALID_SYSTEM_RECORD_CRC },
     {   3, ALARM_ID_HD_INVALID_SERVICE_RECORD_CRC },
     {   3, ALARM_ID_HD_SOFTWARE_FAULT },