diff --git a/disk-deactivate/disk-deactivate.jq b/disk-deactivate/disk-deactivate.jq
index de8ce3e..2523ff1 100644
--- a/disk-deactivate/disk-deactivate.jq
+++ b/disk-deactivate/disk-deactivate.jq
@@ -26,7 +26,9 @@ def remove:
 def deactivate:
   if .type == "disk" then
     [
-      "wipefs --all -f \(.path)"
+      "wipefs --all -f \(.path)",
+      # Remove the MBR bootstrap code
+      "dd if=/dev/zero of=\(.path) bs=440 count=1"
     ]
   elif .type == "part" then
     [