diff --git a/sota-implementations/dqn/dqn_atari.py b/sota-implementations/dqn/dqn_atari.py
index ae012cadec8..786e5d2ebb0 100644
--- a/sota-implementations/dqn/dqn_atari.py
+++ b/sota-implementations/dqn/dqn_atari.py
@@ -20,7 +20,7 @@
 from torchrl._utils import timeit
 
 from torchrl.collectors import SyncDataCollector
-from torchrl.data import LazyTensorStorage, TensorDictReplayBuffer
+from torchrl.data import LazyMemmapStorage, TensorDictReplayBuffer
 from torchrl.envs import ExplorationType, set_exploration_type
 from torchrl.modules import EGreedyModule
 from torchrl.objectives import DQNLoss, HardUpdate
@@ -65,15 +65,14 @@ def main(cfg: "DictConfig"):  # noqa: F821
 
     # Create the replay buffer
     if cfg.buffer.scratch_dir in ("", None):
-        storage_cls = functools.partial(LazyTensorStorage, device=device)
-        transform = None
+        storage_cls = LazyMemmapStorage
     else:
         storage_cls = functools.partial(
-            LazyTensorStorage, scratch_dir=cfg.buffer.scratch_dir
+            LazyMemmapStorage, scratch_dir=cfg.buffer.scratch_dir
         )
 
-        def transform(td):
-            return td.to(device)
+    def transform(td):
+        return td.to(device)
 
     replay_buffer = TensorDictReplayBuffer(
         pin_memory=False,