diff --git a/nixos/hosts/steamdeck/disks.nix b/nixos/hosts/steamdeck/disks.nix
index 68ed7362..1b31c2e3 100644
--- a/nixos/hosts/steamdeck/disks.nix
+++ b/nixos/hosts/steamdeck/disks.nix
@@ -25,7 +25,7 @@
           }; # partition 1 (ESP)
           ROOT = { 
             start = "550MiB";
-            end = "100%";
+            size = "100%";
             content = {
               type = "btrfs";
               extraArgs = [ "-f" ];
@@ -48,5 +48,29 @@
         }; # partitions
       }; # content
     }; # disko.devices.disk.nvme0
-  }; # disko.devices.disk
+
+    mmcblk0 = {
+      type = "disk";
+      device = "/dev/mmcblk0";
+      content = { 
+        type = "gpt";
+        partitions = { 
+          MICROSD = {
+            name = "MICROSD";
+            size = "100%";
+            content = {
+              type = "btrfs";
+              extraArgs = [ "-f" ];
+              subvolumes = {
+                "/microsd" = {
+                  mountpoint = "/microsd";
+                  mountOptions = [ "compress=none" "noatime" ];
+                }; # sd_card
+              }; # subvolumes
+            }; # content
+          }; # partition 2 (MICROSD BTRFS)
+        }; # partitions
+      }; # content
+    }; # disko.devices.disk.mmcblk0
+  }; # disko.devices
 } # root