change to btrfs on mc4

systems/mc4/hardware-configuration.nix

@@ -1,18 +1,37 @@
-{ modulesPath, ... }:
+# Do not modify this file!  It was generated by ‘nixos-generate-config’
+# and may be overwritten by future invocations.  Please make changes
+# to /etc/nixos/configuration.nix instead.
+{ config, lib, pkgs, modulesPath, ... }:
+
 {
-  imports = [ (modulesPath + "/profiles/qemu-guest.nix") ];
+  imports =
+    [ (modulesPath + "/profiles/qemu-guest.nix")
+    ];
+
+  boot.initrd.availableKernelModules = [ "xhci_pci" "virtio_pci" "usbhid" ];
+
+  fileSystems."/" =
+    { device = "/dev/disk/by-uuid/7081c92b-d474-49d9-a3d5-8285e7b92b62";
+      fsType = "btrfs";
+      options = [ "compress-force=zstd:7" ];
+    };
+
+  fileSystems."/boot" =
+    { device = "/dev/disk/by-uuid/C2EB-7223";
+      fsType = "vfat";
+    };
+
+  swapDevices = [ ];
   boot.loader.grub = {
     efiSupport = true;
     efiInstallAsRemovable = true;
     device = "nodev";
   };
-  fileSystems."/boot" = { device = "/dev/disk/by-uuid/C2EB-7223"; fsType = "vfat"; };
   boot.initrd.kernelModules = [ "nvme" ];
-  fileSystems."/" = { device = "/dev/sda3"; fsType = "xfs"; };
   networking = {
     useDHCP = false;
     interfaces.enp0s3.useDHCP = true;
     hostName = "mc4";
   };
+
 }
-# vim: set et ts=2 sw=2 ai: