diff --git a/ROMFS/px4fmu_common/init.d/rcS b/ROMFS/px4fmu_common/init.d/rcS
index 77d507b29a..ed622ad36e 100644
--- a/ROMFS/px4fmu_common/init.d/rcS
+++ b/ROMFS/px4fmu_common/init.d/rcS
@@ -101,6 +101,33 @@ then
 			hardfault_log reset
 		fi
 	fi
+
+	# Prevent MacOS and Ubuntu from creating unnecessary temporary files on the microSD card
+
+	# block MacOS Spotlight indexing (.Spotlight-V100 folder)
+	if [ ! -f "/fs/microsd/.metadata_never_index" ]; then
+		cat > /fs/microsd/.metadata_never_index
+	fi
+
+	# block MacOS trashes
+	if [ ! -f "/fs/microsd/.Trashes" ]; then
+		cat > /fs/microsd/.Trashes
+	fi
+
+	# block MacOS logging of filesystem events
+	if [ ! -d "/fs/microsd/.fseventsd" ]; then
+		mkdir /fs/microsd/.fseventsd
+	fi
+
+	if [ ! -f "/fs/microsd/.fseventsd/no_log" ]; then
+		cat > /fs/microsd/.fseventsd/no_log
+	fi
+
+	# block Ubuntu trash
+	if [ ! -f "/fs/microsd/.Trash-1000" ]; then
+		cat > /fs/microsd/.Trash-1000
+	fi
+
 else
 	# tune SD_INIT
 	set STARTUP_TUNE 16