Index: NVDataMgmtHDRecords.h
===================================================================
diff -u -r087ae6de4dd6ffb50cf272e9d0aefaed062305ff -r3a57b1955aa7516898e4c2c855978bbf01c8ec62
--- NVDataMgmtHDRecords.h	(.../NVDataMgmtHDRecords.h)	(revision 087ae6de4dd6ffb50cf272e9d0aefaed062305ff)
+++ NVDataMgmtHDRecords.h	(.../NVDataMgmtHDRecords.h)	(revision 3a57b1955aa7516898e4c2c855978bbf01c8ec62)
@@ -147,6 +147,14 @@
     NUM_OF_CAL_DATA_HD_TEMP_SENSORS,                                                                            ///< Number of HD temperature sensors.
 } CAL_DATA_HD_TEMEPERATURE_SENSORS_T;
 
+/// HD usage info items
+typedef enum hd_usage_items
+{
+    USAGE_INFO_TX_HOURS_SINCE_LAST_SRVC = 0,                                                                    ///< Usage info Tx hours since last service.
+    USAGE_INFO_START_TX_TIME,                                                                                   ///< Usage info Tx start time.
+    NUM_OF_USAGE_INFO_ITEMS                                                                                     ///< Number of usage info items.
+} HD_USAGE_INFO_ITEMS_T;
+
 #pragma pack(push, 1)
 /// Polynomial calibration structure
 typedef struct