First Try

modules/nixos/disk-config.nix

@@ -0,0 +1,34 @@
+_: {
+  # This formats the disk with the ext4 filesystem
+  # Other examples found here: https://github.com/nix-community/disko/tree/master/example
+  disko.devices = {
+    disk = {
+      vdb = {
+        device = "/dev/%DISK%";
+        type = "disk";
+        content = {
+          type = "gpt";
+          partitions = {
+            ESP = {
+              type = "EF00";
+              size = "100M";
+              content = {
+                type = "filesystem";
+                format = "vfat";
+                mountpoint = "/boot";
+              };
+            };
+            root = {
+              size = "100%";
+              content = {
+                type = "filesystem";
+                format = "ext4";
+                mountpoint = "/";
+              };
+            };
+          };
+        };
+      };
+    };
+  };
+}