diff --git a/shared/gen-disk-config.py b/shared/gen-disk-config.py
index c551127..27f86f0 100644
--- a/shared/gen-disk-config.py
+++ b/shared/gen-disk-config.py
@@ -9,6 +9,7 @@
 #
 # Layout (replica el hardware): NVMe = ESP 512M + /boot 1G ext4 + / btrfs (resto);
 # SDA = /home ext4 (todo). swap = zram (lo pone "swap": true del base).
+# Si SDA no existe (portatil de 1 disco), se omite: /home queda dentro del / btrfs.
 import json, sys
 from pathlib import Path
 from archinstall.lib.disk.device_handler import device_handler
@@ -61,13 +62,19 @@ def main():
     sda = sys.argv[3] if len(sys.argv) > 3 else "/dev/sda"
 
     dev_nvme = device_handler.get_device(Path(nvme))
+    if not dev_nvme:
+        sys.exit(f"No encuentro el disco de sistema {nvme} (revisa lsblk)")
+
+    # 2 discos -> layout hardware: NVMe=sistema, SDA=/home aparte.
+    # 1 disco (portatil) -> todo en el NVMe; /home vive dentro del btrfs raiz.
     dev_sda = device_handler.get_device(Path(sda))
-    if not dev_nvme or not dev_sda:
-        sys.exit(f"No encuentro los discos {nvme} / {sda} (revisa lsblk)")
+    mods = [nvme_mods(dev_nvme)]
+    if dev_sda:
+        mods.append(sda_mods(dev_sda))
 
     layout = DiskLayoutConfiguration(
         config_type=DiskLayoutType.Manual,
-        device_modifications=[nvme_mods(dev_nvme), sda_mods(dev_sda)],
+        device_modifications=mods,
     )
     cfg = json.loads(Path(base_path).read_text())
     cfg["disk_config"] = layout.json()