diff --git a/board/sandbox/README.sandbox b/board/sandbox/README.sandbox
index 2e2c819..9bc13e1 100644
--- a/board/sandbox/README.sandbox
+++ b/board/sandbox/README.sandbox
@@ -337,6 +337,11 @@ $> lodev=`sudo losetup -P -f --show ./disk.raw`
 $> sudo mkfs.vfat -n EFI -v ${lodev}p1
 $> sudo mkfs.ext4 -L ROOT -v ${lodev}p2
 
+or utilize the device described in test/py/make_test_disk.py:
+
+   #!/usr/bin/python
+   import make_test_disk
+   make_test_disk.makeDisk()
 
 Writing Sandbox Drivers
 -----------------------
diff --git a/test/py/make_test_disk.py b/test/py/make_test_disk.py
new file mode 100755
index 0000000..5288295
--- /dev/null
+++ b/test/py/make_test_disk.py
@@ -0,0 +1,19 @@
+# Copyright (c) 2017 Alison Chaiken
+#
+# SPDX-License-Identifier: GPL-2.0
+#
+# Create a block device for testing of 'gpt' and 'part' commands.
+
+import os
+
+def makeDisk():
+    if (os.path.exists("testdisk.raw")):
+        os.remove("testdisk.raw")
+    fd = os.open("testdisk.raw", os.O_RDWR|os.O_CREAT )
+    os.ftruncate(fd, 4194304)
+    os.close(fd)
+    os.spawnl(os.P_WAIT, "/sbin/sgdisk", "sgdisk", "-U",
+          "375a56f7-d6c9-4e81-b5f0-09d41ca89efe", "testdisk.raw")
+    os.spawnl(os.P_WAIT, "/sbin/sgdisk", "sgdisk", "--new=1:2048:2560", "testdisk.raw")
+    os.spawnl(os.P_WAIT, "/sbin/sgdisk", "sgdisk", "--new=2:4096:4608", "testdisk.raw")
+    os.spawnl(os.P_WAIT, "/sbin/gdisk", "sgdisk", "-l", "testdisk.raw")