diff --git a/modules/storage.nix b/modules/storage.nix
index 2e20d19..4a1f649 100644
--- a/modules/storage.nix
+++ b/modules/storage.nix
@@ -1,10 +1,10 @@
-{ config, ... }:
+{ config, lib, pkgs, ... }:
 {
   systemd.services.zfs-mount.enable = false;
  
   networking.hostId = "07019099";
   boot.supportedFilesystems = [ "zfs" ];
-  boot.zfs.devNodes = "/dev/disk/by-id/ata-WDC_WD30EZRZ-00Z5HB0_WD-WCC4N7LL2J1S-part1";  #oder mit  -part1 am ende
+  boot.zfs.devNodes = "/dev/disk/by-id/ata-WDC_WD30EZRZ-00Z5HB0_WD-WCC4N7LL2J1S-part1";
  
   fileSystems."/bfds-nix" =
     { device = "bfds-nix";
@@ -40,4 +40,19 @@
     { device = "bfds-nix/ebooks";
       fsType = "zfs";
     };
+
+  systemd.services.hdparm = {
+    description = "Set hdparm energy settings at boot";
+    wantedBy = [ "multi-user.target" ];
+
+    serviceConfig = {
+      Type = "oneshot";
+      ExecStart = ''
+        /run/current-system/sw/bin/hdparm -B 72 /dev/sda
+        /run/current-system/sw/bin/hdparm -B 72 /dev/sdb
+        /run/current-system/sw/bin/hdparm -B 72 /dev/sdc
+      '';
+      User = "root";
+    };
+  };
 }