Index: sources/storage/StorageGlobals.cpp
===================================================================
diff -u -rec7f919fdb70ff29a8de627937e4ad7008e59c1c -r3a528c6f3fce8132de2791b55d3227e715d68898
--- sources/storage/StorageGlobals.cpp	(.../StorageGlobals.cpp)	(revision ec7f919fdb70ff29a8de627937e4ad7008e59c1c)
+++ sources/storage/StorageGlobals.cpp	(.../StorageGlobals.cpp)	(revision 3a528c6f3fce8132de2791b55d3227e715d68898)
@@ -40,7 +40,18 @@
     const char  *USB_File_System = "vfat";
 
     // SD-CARD
-    const short Available_Space_Percent = 15;
+    const short Log_Min_Available_Total_Space_Percent = 15; // Min free     : 15 // always has to be 15 percent free space available, less than this triggers the log cleanup.
+    const short Log_Max_Allowable_Event_Space_Percent = 25;
+    const short Log_Max_Allowable_Datum_Space_Percent = 25;
+    const short Log_Max_Allowable_AppED_Space_Percent = Log_Max_Allowable_Event_Space_Percent + Log_Max_Allowable_Datum_Space_Percent; // 50
+    const short Log_Max_Allowable_Debug_Space_Percent = 15;
+    const short Log_Max_Allowable_Trtmt_Space_Percent = 10;
+    //                                                      // Max Usage    : 75 =  25 + 25 + 15 + 10
+    //                                                      // Max Used     : 85 = 100 - 15
+    //                                                      // Min Buffer   : 10 =  85 - 75
+    //  IMPORTANT: we have to keep 10% buffer otherwise competition between filling and deleting logs will cause application to crash eventually.
+    short Log_Min_Available_Total_Space_IsLow(short vPercent) { return vPercent < Log_Min_Available_Total_Space_Percent; }
+
 #ifdef BUILD_FOR_TARGET
     const char  *SDCard_Base_Path_Name = "/media/sd-card/";
 #else