diff --git a/ereuse_devicehub/dummy/dummy.py b/ereuse_devicehub/dummy/dummy.py
index b984e9c5..472bd652 100644
--- a/ereuse_devicehub/dummy/dummy.py
+++ b/ereuse_devicehub/dummy/dummy.py
@@ -28,6 +28,7 @@ class Dummy:
     ET = (
         ('A0000000000001', 'DT-AAAAA'),
         ('A0000000000002', 'DT-BBBBB'),
+        ('A0000000000002', 'DT-CCCCC'),
     )
     """eTags to create."""
     ORG = 'eReuse.org CAT', '-t', 'G-60437761', '-c', 'ES'
diff --git a/ereuse_devicehub/dummy/files/oreo.snapshot.yaml b/ereuse_devicehub/dummy/files/oreo.snapshot.yaml
new file mode 100644
index 00000000..4ceeb12d
--- /dev/null
+++ b/ereuse_devicehub/dummy/files/oreo.snapshot.yaml
@@ -0,0 +1,169 @@
+{
+  "uuid": "de4f495e-c58b-40e1-a33e-46ab5e84767e",
+  "endTime": "2018-10-24T11:03:36.113006+00:00",
+  "components": [
+    {
+      "speed": 1000,
+      "manufacturer": "Realtek Semiconductor Co., Ltd.",
+      "wireless": false,
+      "model": "RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller",
+      "serialNumber": "00:26:18:96:dc:af",
+      "type": "NetworkAdapter",
+      "events": []
+    },
+    {
+      "speed": 1333.0,
+      "manufacturer": null,
+      "interface": "DDR",
+      "model": null,
+      "serialNumber": null,
+      "type": "RamModule",
+      "format": "DIMM",
+      "size": 2048,
+      "events": []
+    },
+    {
+      "speed": 1333.0,
+      "manufacturer": null,
+      "interface": "DDR",
+      "model": null,
+      "serialNumber": null,
+      "type": "RamModule",
+      "format": "DIMM",
+      "size": 2048,
+      "events": []
+    },
+    {
+      "speed": 1333.0,
+      "manufacturer": null,
+      "interface": "DDR",
+      "model": null,
+      "serialNumber": null,
+      "type": "RamModule",
+      "format": "DIMM",
+      "size": 2048,
+      "events": []
+    },
+    {
+      "speed": 1333.0,
+      "manufacturer": null,
+      "interface": "DDR",
+      "model": null,
+      "serialNumber": null,
+      "type": "RamModule",
+      "format": "DIMM",
+      "size": 2048,
+      "events": []
+    },
+    {
+      "manufacturer": "Intel Corporation",
+      "model": "5 Series/3400 Series Chipset High Definition Audio",
+      "serialNumber": null,
+      "type": "SoundCard",
+      "events": []
+    },
+    {
+      "speed": 2.5330000000000004,
+      "manufacturer": "Intel Corp.",
+      "cores": 4,
+      "address": 64,
+      "model": "Intel Core i7 CPU 860 @ 2.80GHz",
+      "serialNumber": null,
+      "type": "Processor",
+      "threads": 8,
+      "events": [
+        {
+          "elapsed": 9,
+          "type": "BenchmarkProcessorSysbench",
+          "rate": 8.7418
+        },
+        {
+          "elapsed": 0,
+          "type": "BenchmarkProcessor",
+          "rate": 44937.520000000004
+        }
+      ]
+    },
+    {
+      "manufacturer": null,
+      "interface": "ATA",
+      "model": "SAMSUNG HD103SJ",
+      "serialNumber": "S246J90Z406422",
+      "type": "HardDrive",
+      "size": 953869,
+      "events": [
+        {
+          "elapsed": 120,
+          "lifetime": 14298,
+          "currentPendingSectorCount": 0,
+          "type": "TestDataStorage",
+          "status": "Completed without error",
+          "powerCycleCount": 693,
+          "assessment": true,
+          "offlineUncorrectable": 0,
+          "error": false,
+          "length": "Short",
+          "reallocatedSectorCount": 0
+        },
+        {
+          "readSpeed": 136.0,
+          "elapsed": 9,
+          "type": "BenchmarkDataStorage",
+          "writeSpeed": 35.0
+        }
+      ]
+    },
+    {
+      "manufacturer": "NVIDIA Corporation",
+      "model": "G84 GeForce 8600 GT",
+      "serialNumber": null,
+      "type": "GraphicCard",
+      "memory": 256.0,
+      "events": []
+    },
+    {
+      "firewire": 1,
+      "manufacturer": "ASUSTeK Computer INC.",
+      "usb": 2,
+      "model": "P7P55D",
+      "serialNumber": "101005570001137",
+      "type": "Motherboard",
+      "pcmcia": 0,
+      "slots": 4,
+      "serial": 1,
+      "events": []
+    }
+  ],
+  "elapsed": 203,
+  "device": {
+    "manufacturer": null,
+    "model": null,
+    "chassis": "Tower",
+    "type": "Desktop",
+    "serialNumber": null,
+    "events": [
+      {
+        "elapsed": 60,
+        "type": "StressTest",
+        "error": false
+      },
+      {
+        "elapsed": 1,
+        "type": "BenchmarkRamSysbench",
+        "rate": 0.8315
+      }
+    ],
+    "tags": [
+      {"id": "A0000000000002", "type": "Tag"}
+    ]
+  },
+  "version": "11.0a6",
+  "expectedEvents": [
+    "Benchmark",
+    "TestDataStorage",
+    "StressTest"
+  ],
+  "type": "Snapshot",
+  "closed": true,
+  "software": "Workbench"
+}
diff --git a/ereuse_devicehub/resources/enums.py b/ereuse_devicehub/resources/enums.py
index 9b882f46..e116f5a5 100644
--- a/ereuse_devicehub/resources/enums.py
+++ b/ereuse_devicehub/resources/enums.py
@@ -244,7 +244,7 @@ class ComputerChassis(Enum):
     Tablet = 'Tablet'
     Virtual = 'Non-physical device'
 
-    def __format__(self, format_spec):
+    def __str__(self):
         return inflection.humanize(inflection.underscore(self.value))
 
 
diff --git a/tests/files/erase-sectors-2-hdd.snapshot.yaml b/tests/files/erase-sectors-2-hdd.snapshot.yaml
index 0fd43f8a..84eb5a9c 100644
--- a/tests/files/erase-sectors-2-hdd.snapshot.yaml
+++ b/tests/files/erase-sectors-2-hdd.snapshot.yaml
@@ -1,9 +1,9 @@
 {
   "version": "11.0a3",
   "device": {
-    "serialNumber": null,
-    "manufacturer": null,
-    "model": null,
+    "serialNumber": 'foo',
+    "manufacturer": 'bar',
+    "model": 'baz',
     "type": "Desktop",
     "events": [],
     "chassis": "Tower"
@@ -53,7 +53,8 @@
     "type": "NetworkAdapter",
     "events": [],
     "serialNumber": "f4:6d:04:12:9b:85",
-    "speed": 1000
+    "speed": 1000,
+    "wireless": false
   },
   {
     "serialNumber": "WD-WCAV29008961",
@@ -86,7 +87,7 @@
       "error": true,
       "currentPendingSectorCount": 1,
       "powerCycleCount": 1253,
-      "reallocatedSectorCount": 6,
+      "reallocatedSectorCount": 15,
       "type": "TestDataStorage",
       "status": "Completed: read failure"
     }
diff --git a/tests/test_snapshot.py b/tests/test_snapshot.py
index afdaa1e9..33e0b93c 100644
--- a/tests/test_snapshot.py
+++ b/tests/test_snapshot.py
@@ -322,6 +322,15 @@ def test_erase(user: UserClient):
     assert snapshot['components'][0]['privacy'] == 'EraseSectorsError'
 
 
+def test_test_data_storage(user: UserClient):
+    """Tests a Snapshot with EraseSectors."""
+    s = file('erase-sectors-2-hdd.snapshot')
+    snapshot, _ = user.post(res=Snapshot, data=s)
+    incidence_test = next(ev for ev in snapshot['events'] if ev['reallocatedSectorCount'] == 15)
+    assert incidence_test['incidence']
+    assert incidence_test['description'] == 'Warning: Drive failure expected soon.'
+
+
 def test_snapshot_computer_monitor(user: UserClient):
     s = file('computer-monitor.snapshot')
     snapshot_and_check(user, s, event_types=('ManualRate',))