diff --git a/vm-setup.sh b/vm-setup.sh
index bfb49bc..54fb402 100644
--- a/vm-setup.sh
+++ b/vm-setup.sh
@@ -97,3 +97,9 @@
 sudo dpkg-reconfigure -f noninteractive wireshark-common
 sudo usermod -a -G wireshark mininet
 
+# ------------- Zero Unused Blocks -------------
+#TODO investigate zerofree
+echo "Zeroing unused blocks"
+dd if=/dev/zero of=tmp-zeros
+sync
+rm tmp-zeros