Add a check for an unmounted (but not removed) SD card

Author: PaulZC

Firmware/RTK_Everywhere/GNSS_Mosaic.ino

@@ -2610,7 +2610,7 @@ void GNSS_MOSAIC::update()
     {
         updateSD(); // Check if the card has been removed / inserted
 
-        if (_diskStatusSeen) // Check if the DiskStatus SBF message has been processed
+        if (_diskStatusSeen) // Check if the DiskStatus SBF message has been seen
         {
             // If previousFreeSpace hasn't been initialized, initialize it
             if (previousFreeSpace == 0)
@@ -2637,6 +2637,12 @@ void GNSS_MOSAIC::update()
                 previousFreeSpace = sdFreeSpace;
             }
         }
+        else
+        {
+            // Disk status not seen
+            // (Unmounting the SD card will prevent _diskStatusSeen from going true)
+            logIncreasing = false;
+        }
 
         sdCardSizeLastCheck = millis(); // Update the timer
         _diskStatusSeen = false; // Clear the flag