diff --git a/Makefile b/Makefile
index fc2edf2..268e206 100644
--- a/Makefile
+++ b/Makefile
@@ -89,7 +89,19 @@ net.rrd:
 update_net: net.rrd
 	rrdtool update $< $(NOW):$(shell cat /proc/net/dev |grep $(IFACE) |awk '{print $$2,$$10}' |tr ' ' ':' )
 
-update: update_cpu update_load update_mem update_net
+disk.rrd:
+	rrdtool create $@ --start $$(( $(NOW) - 1 )) --step $(STEP) --no-overwrite \
+		DS:MBfsfree:COUNTER:120:0:U \
+		DS:MBfsused:COUNTER:120:0:U \
+		RRA:LAST:0.5:1:1440 \
+		RRA:AVERAGE:0.5:420:1440 \
+		RRA:AVERAGE:0.5:1860:1440 \
+		RRA:AVERAGE:0.5:21900:1440
+
+update_disk: disk.rrd
+	rrdtool update $< $(NOW):$(shell sar -F MOUNT --fs=/ 0 -1 |tail -n 1 |awk '{print $$2,$$3}' |tr ' ' ':' )
+
+update: update_cpu update_load update_mem update_net update_disk
 
 run:
 	while true; do make update; sleep $(STEP); done
@@ -146,4 +158,11 @@ $(BUILD_DIR)/net-daily$(EXTENSION): net.rrd
 		AREA:rbytes#$(DANGER):rbytes \
 		AREA:ntbytes#$(SUCCESS):tbytes
 
-graph: $(BUILD_DIR)/cpu-daily$(EXTENSION) $(BUILD_DIR)/load-daily$(EXTENSION) $(BUILD_DIR)/mem-daily$(EXTENSION) $(BUILD_DIR)/net-daily$(EXTENSION)
+$(BUILD_DIR)/disk-daily$(EXTENSION): disk.rrd
+	rrdtool graph $@ --imgformat $(FORMAT) --end now --start end-$(DAY_IN_SECS) \
+		DEF:MBfsfree=$<:MBfsfree:AVERAGE \
+		DEF:MBfsused=$<:MBfsused:AVERAGE \
+		AREA:MBfsused#$(DANGER):MBfsused:STACK \
+		AREA:MBfsfree#$(SUCCESS):MBfsfree:STACK
+
+graph: $(BUILD_DIR)/cpu-daily$(EXTENSION) $(BUILD_DIR)/load-daily$(EXTENSION) $(BUILD_DIR)/mem-daily$(EXTENSION) $(BUILD_DIR)/net-daily$(EXTENSION) $(BUILD_DIR)/disk-daily$(EXTENSION)