diff --git a/templates/nix-config/disks/mirror.nix b/templates/nix-config/disks/mirror.nix
index acb4d40..f24d208 100644
--- a/templates/nix-config/disks/mirror.nix
+++ b/templates/nix-config/disks/mirror.nix
@@ -35,6 +35,10 @@
       raid1 = {
         type = "mdadm";
         level = 1;
+        settings = {
+          startOptions = [ "--run" "--bitmap=internal" ];
+          mdadmMetadata = "1.2";
+        };
         content = {
           type = "luks";
           name = "crypted-mirror";