diff --git a/machines/nix-book/hardware-configuration.nix b/machines/nix-book/hardware-configuration.nix
index b23fb94..3be2f73 100644
--- a/machines/nix-book/hardware-configuration.nix
+++ b/machines/nix-book/hardware-configuration.nix
@@ -15,7 +15,11 @@
 
   fileSystems."/" =
     { device = "/dev/disk/by-uuid/bd396529-e2c4-47cb-b844-8d6ed841f81a";
-      fsType = "ext4";
+      fsType = "btrfs";
+      options = [ 
+        "compress=zstd"  # Enable zstd compression for space savings
+        "noatime"        # Don't update access times for performance
+      ];
     };
 
   boot.initrd.luks.devices."luks-4126fbd4-bd09-4ece-af0d-6fff414c21b3".device = "/dev/disk/by-uuid/4126fbd4-bd09-4ece-af0d-6fff414c21b3";