diff --git a/templates/nix-config/disks/mirror.nix b/templates/nix-config/disks/mirror.nix
index 5eb58fa..6ff09df 100644
--- a/templates/nix-config/disks/mirror.nix
+++ b/templates/nix-config/disks/mirror.nix
@@ -48,7 +48,6 @@
       "data-storage" = {
         type = "mdadm";
         level = 1;
-        postCreateHook = "mdadm --grow /dev/md/data-storage --bitmap=internal";
         content = {
           type = "filesystem";
           format = "xfs";