diff --git a/common/zerodisk.sh b/common/zerodisk.sh
new file mode 100644
index 0000000..9b20b18
--- /dev/null
+++ b/common/zerodisk.sh
@@ -0,0 +1,4 @@
+dd if=/dev/zero of=/EMPTY bs=1M || true
+rm -f /EMPTY
+echo 3 > /proc/sys/vm/drop_caches
+sync