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+{ ... }:
+
+# Disk layout for nixos-anywhere + disko.
+# Targets a single virtio disk (typical for Hetzner Cloud).
+# GPT with a BIOS-boot partition so GRUB works without UEFI.
+{
+  disko.devices = {
+    disk.main = {
+      # Hetzner Cloud primary disk is /dev/sda on most instance types.
+      # On NVMe instances it will be /dev/nvme0n1 - update accordingly.
+      device = "/dev/sda";
+      type = "disk";
+      content = {
+        type = "gpt";
+        partitions = {
+          # 1 MiB BIOS-boot partition required by GRUB on GPT disks
+          boot = {
+            size = "1M";
+            type = "EF02"; # BIOS boot
+            priority = 1;
+          };
+
+          # 512 MiB /boot - keeps kernels/initrds out of root for clarity
+          ESP = {
+            size = "512M";
+            type = "8300";
+            content = {
+              type = "filesystem";
+              format = "ext4";
+              mountpoint = "/boot";
+            };
+          };
+
+          # Root partition - all remaining space
+          root = {
+            size = "100%";
+            content = {
+              type = "filesystem";
+              format = "ext4";
+              mountpoint = "/";
+            };
+          };
+        };
+      };
+    };
+  };
+}