{ ... }:
{
  # BIOS/GPT single-disk layout for the KVM VPS (virtio /dev/vda).
  # EF02 grub partition + a small swap + ext4 root spanning the rest.
  disko.devices.disk.main = {
    type = "disk";
    device = "/dev/vda";
    content = {
      type = "gpt";
      partitions = {
        boot = {
          size = "1M";
          type = "EF02"; # BIOS boot partition for GRUB
        };
        swap = {
          size = "4G";
          content = {
            type = "swap";
            discardPolicy = "both";
          };
        };
        root = {
          size = "100%";
          content = {
            type = "filesystem";
            format = "ext4";
            mountpoint = "/";
          };
        };
      };
    };
  };
}