Index: sources/storage/Logger.cpp
===================================================================
diff -u -r75e10e5c2ada62906baded5ba8731977e51b1357 -r1ed15b374613c81883e697cad25e55399e7abc17
--- sources/storage/Logger.cpp	(.../Logger.cpp)	(revision 75e10e5c2ada62906baded5ba8731977e51b1357)
+++ sources/storage/Logger.cpp	(.../Logger.cpp)	(revision 1ed15b374613c81883e697cad25e55399e7abc17)
@@ -687,6 +687,10 @@
     int result = 0;
     QString mSource         = _logPathNames[vLogType];
     QString mDestination    = USB_Mount_Point;
+
+    // Check USB disk space before proceeding
+    if ( !checkExportUSBSpace(vExportList, mSource) ) return false;
+
     if ( vExportList.isEmpty() ) {
         // Copy Folder
         result = FileHandler::copyFolder( mSource, mDestination);
@@ -703,3 +707,42 @@
     }
     return result >= 0; // refer to QProcess::execute(hit F1 on execute) doc.
 }
+
+/*!
+ * \brief   Logger::checkExportUSBSpace
+ * \details Check the USB to make sure there is enough space to accomodate exporting either a list of files or
+ *          an entire folder at source
+ * \param   vExportList - List of files to export
+ * \param   vSource     - The source path of the folder to export or the folder where files in list reside
+ * \return  true if there is enough space on the USB for exporting the list of files or the entire directory, false otherwise
+ */
+bool Logger::checkExportUSBSpace(const Gui::GuiStringIndexMap &vExportList, const QString &vSource)
+{
+    qint64 totalSpace      =     0;
+    qint64 availableSpace  =     0;
+
+    bool isUSBDiskReady = _DeviceController.driveSpaceCheck(Storage::USB_Mount_Point, totalSpace, availableSpace);
+    if ( !isUSBDiskReady ) return false;
+
+    qint64 totalExportSizeExpected = 0;
+
+    if ( vExportList.isEmpty() ) {
+        // expecting to export an entire directory, get size of directory
+        totalExportSizeExpected = FileHandler::totalDirSize(vSource);
+    }else{
+        // exporting individual files, need to get total size of selected files
+        Gui::GuiStringIndexMapIterator it(vExportList);
+        QDir srcDir = QFileInfo (vSource).absoluteDir();
+
+        while ( it.hasNext() ) {
+            it.next();
+            auto fileName = it.value();
+            QFile srcFile = QFile   (vSource + fileName);
+            totalExportSizeExpected += srcFile.size();
+            //DEBUG: qDebug()<< "FILE " << srcFile.fileName() << " size " << srcFile.size();
+        }
+    }
+
+    //DEBUG: qDebug()<< "available " << availableSpace << " | total "<< totalSpace << " | size copying " << totalExportSizeExpected << " | expecting after " << (availableSpace + totalExportSizeExpected);
+    return (availableSpace + totalExportSizeExpected) < totalSpace;
+}