diff --git a/DiscImageChef.DiscImages/ZZZRawImage.cs b/DiscImageChef.DiscImages/ZZZRawImage.cs
index 61a6829c..09c41ae3 100644
--- a/DiscImageChef.DiscImages/ZZZRawImage.cs
+++ b/DiscImageChef.DiscImages/ZZZRawImage.cs
@@ -152,8 +152,6 @@ namespace DiscImageChef.ImagePlugins
                     case 512512:
                     case 102400:
                     case 204800:
-                    case 163840:
-                    case 327680:
                     case 655360:
                     case 80384: // T0S0 = 128bps
                     case 325632: // T0S0 = 128bps, T0S1 = 256bps
diff --git a/DiscImageChef.Tests/Filesystems/FAT12.cs b/DiscImageChef.Tests/Filesystems/FAT12.cs
new file mode 100644
index 00000000..3c2c2a4f
--- /dev/null
+++ b/DiscImageChef.Tests/Filesystems/FAT12.cs
@@ -0,0 +1,112 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : ADFS.cs
+// Version        : 1.0
+// Author(s)      : Natalia Portillo
+//
+// Component      : Component
+//
+// Revision       : $Revision$
+// Last change by : $Author$
+// Date           : $Date$
+//
+// --[ Description ] ----------------------------------------------------------
+//
+// Description
+//
+// --[ License ] --------------------------------------------------------------
+//
+//     This program is free software: you can redistribute it and/or modify
+//     it under the terms of the GNU General Public License as
+//     published by the Free Software Foundation, either version 3 of the
+//     License, or (at your option) any later version.
+//
+//     This program is distributed in the hope that it will be useful,
+//     but WITHOUT ANY WARRANTY; without even the implied warranty of
+//     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//     GNU General Public License for more details.
+//
+//     You should have received a copy of the GNU General Public License
+//     along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+// ----------------------------------------------------------------------------
+// Copyright (C) 2011-2015 Claunia.com
+// ****************************************************************************/
+// //$Id$
+using System;
+using NUnit.Framework;
+using System.IO;
+using DiscImageChef.Filters;
+using DiscImageChef.ImagePlugins;
+using DiscImageChef.CommonTypes;
+using DiscImageChef.Filesystems;
+
+namespace DiscImageChef.Tests.Filesystems
+{
+    [TestFixture]
+    public class ADFS
+    {
+        readonly string[] testfiles = {
+            "adfs_d.adf.lz",
+            "adfs_e.adf.lz",
+            "adfs_f.adf.lz",
+            "adfs_e+.adf.lz",
+            "adfs_f+.adf.lz",
+            "adfs_s.adf.lz",
+            "adfs_m.adf.lz",
+            "adfs_l.adf.lz"
+        };
+
+        readonly MediaType[] mediatypes = {
+            MediaType.ACORN_35_DS_DD,
+            MediaType.ACORN_35_DS_DD,
+            MediaType.ACORN_35_DS_HD,
+            MediaType.ACORN_35_DS_DD,
+            MediaType.ACORN_35_DS_HD,
+            MediaType.ACORN_525_SS_DD_40,
+            MediaType.ACORN_525_SS_DD_80,
+            MediaType.ACORN_525_DS_DD
+        };
+
+        readonly ulong[] sectors = { 1600, 1600, 1600, 1600, 1600, 640, 1280, 2560 };
+
+        readonly uint[] sectorsize = { 512, 512, 1024, 512, 1024, 256, 256, 256 };
+
+        readonly bool[] bootable = { false, false, false, false, false, false, false, false };
+
+        readonly long[] clusters = { 1600, 1600, 1600, 1600, 1600, 640, 1280, 2560 };
+
+        readonly int[] clustersize = { 512, 512, 1024, 512, 1024, 256, 256, 256 };
+
+        readonly string[] volumename = { "ADFSD", "ADFSE", "", "ADFSE+", "", "", "", "" };
+
+        readonly string[] volumeserial = { "0", "0", "0", "0", "0", "0", "0", "0" };
+
+        [Test]
+        public void Test()
+        {
+            for(int i = 0; i < testfiles.Length; i++)
+            {
+                string location = Path.Combine(Consts.TestFilesRoot, "filesystems", "adfs", testfiles[i]);
+                Filter filter = new LZip();
+                filter.Open(location);
+                ImagePlugin image = new ZZZRawImage();
+                Assert.AreEqual(true, image.OpenImage(filter), testfiles[i]);
+                Assert.AreEqual(mediatypes[i], image.ImageInfo.mediaType, testfiles[i]);
+                Assert.AreEqual(sectors[i], image.ImageInfo.sectors, testfiles[i]);
+                Assert.AreEqual(sectorsize[i], image.ImageInfo.sectorSize, testfiles[i]);
+                Filesystem fs = new AcornADFS();
+                Assert.AreEqual(true, fs.Identify(image, 0, image.ImageInfo.sectors - 1), testfiles[i]);
+                fs.GetInformation(image, 0, image.ImageInfo.sectors - 1, out string information);
+                Assert.AreEqual(bootable[i], fs.XmlFSType.Bootable, testfiles[i]);
+                Assert.AreEqual(clusters[i], fs.XmlFSType.Clusters, testfiles[i]);
+                Assert.AreEqual(clustersize[i], fs.XmlFSType.ClusterSize, testfiles[i]);
+                Assert.AreEqual("Acorn Advanced Disc Filing System", fs.XmlFSType.Type, testfiles[i]);
+                Assert.AreEqual(volumename[i], fs.XmlFSType.VolumeName, testfiles[i]);
+                Assert.AreEqual(volumeserial[i], fs.XmlFSType.VolumeSerial, testfiles[i]);
+            }
+        }
+    }
+}