diff --git a/examples/serve_default_dir.py b/examples/serve_default_dir.py
index 4a0796e..0b4565b 100644
--- a/examples/serve_default_dir.py
+++ b/examples/serve_default_dir.py
@@ -2,11 +2,13 @@
 from neuroglancer_utils.create_datasets.create_sphere import create_sphere
 from neuroglancer_utils.create_datasets.create_allen_multi import create_allen_multi
 from neuroglancer_utils.create_datasets.create_cdf_example import create_cdf_example
+from neuroglancer_utils.create_datasets.create_border_data import create_border_example
 from neuroglancer_utils.local_server import create_server
 
 create_cube()
 create_sphere()
 create_allen_multi()
 create_cdf_example()
+create_border_example()
 create_server(directory="datasets")
 input("Press enter to continue")
diff --git a/neuroglancer_utils/create_datasets/create_border_data.py b/neuroglancer_utils/create_datasets/create_border_data.py
new file mode 100644
index 0000000..284ec5f
--- /dev/null
+++ b/neuroglancer_utils/create_datasets/create_border_data.py
@@ -0,0 +1,17 @@
+from cloudvolume import CloudVolume
+import numpy as np
+
+
+def create_border_example(output_path="file://datasets/border"):
+    shape = (40,) * 3
+    data = np.zeros(shape=shape, dtype=np.uint8)
+    data[4:36, 4:36, 4:36] = 10
+    CloudVolume.from_numpy(
+        data,
+        vol_path=output_path,
+        resolution=(40, 40, 40),
+        chunk_size=(32, 32, 32),
+        layer_type="image",
+        progress=True,
+        compress=False,
+    )
diff --git a/neuroglancer_utils/create_datasets/create_cdf_example.py b/neuroglancer_utils/create_datasets/create_cdf_example.py
index c0d94b7..b7fc32d 100644
--- a/neuroglancer_utils/create_datasets/create_cdf_example.py
+++ b/neuroglancer_utils/create_datasets/create_cdf_example.py
@@ -13,7 +13,7 @@ def create_cdf_example(output_path="file://datasets/cdf"):
         data,
         vol_path=output_path,
         resolution=(40, 40, 40),
-        chunk_size=(40, 40, 40),
+        chunk_size=(32, 32, 32),
         layer_type="image",
         progress=True,
         compress=False,