detect frozen drives and show that the user

include/drive.h

@@ -18,7 +18,8 @@ public:
                     SHRED_SELECTED,
                     SHRED_ACTIVE,
                     DELETE_SELECTED,
-                    DELETE_ACTIVE
+                    DELETE_ACTIVE,
+                    FROZEN
                    } state;
 
     bool bWasShredded = false;
@@ -34,9 +35,11 @@ private:
     uint32_t u32ErrorCount = 0U;
     uint32_t u32PowerOnHours = 0U; //in hours
     uint32_t u32PowerCycles = 0U;
-
+    time_t u32Timestamp = 0U; //unix timestamp for detecting a frozen drive
     double d32TaskPercentage = 0U; //in percent for Shred (1 to 100)
 
+private:
+    void setTimestamp();
 
 protected:
 
@@ -54,6 +57,7 @@ public:
     uint32_t getErrorCount(void);
     uint32_t getPowerOnHours(void); //in hours
     uint32_t getPowerCycles(void);
+    void checkFrozenDrive(void);
 
     void setDriveSMARTData( string modelFamily,
                             string modelName,