diff --git a/server/FTServer.py b/server/FTServer.py
index 6622b08..fc67b53 100644
--- a/server/FTServer.py
+++ b/server/FTServer.py
@@ -243,6 +243,12 @@ def data_export():
    /bin/mount /dev/sd[a-z] /mnt/USB
    fi
    """
+   
+   scriptUnmount = """
+   sync
+   /bin/umount /mnt/USB
+   """
+
    os.system("bash -c '%s'" % scriptMount)
    usbDrive='/mnt/USB/'
    dataDestination = (usbDrive+currentFolder)
@@ -251,6 +257,7 @@ def data_export():
    else:
       os.mkdir(dataDestination)
       copy_tree(workingDirectory, dataDestination)
+   os.system("bash -c '%s'" % scriptUnmount)
    return redirect("/logger")
 
 @flaskApp.route("/api/v1/data/delete", methods=['PUT'])