diff --git a/ATA/Errors.cs b/ATA/Errors.cs
new file mode 100644
index 0000000..877a463
--- /dev/null
+++ b/ATA/Errors.cs
@@ -0,0 +1,111 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : Errors.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;
+
+namespace DiscImageChef.Decoders.ATA
+{
+    public struct AtaRegistersCHS
+    {
+        public byte feature;
+        public byte sectorCount;
+        public byte sector;
+        public byte cylinderLow;
+        public byte cylinderHigh;
+        public byte deviceHead;
+        public byte command;
+    }
+
+    public struct AtaRegistersLBA28
+    {
+        public byte feature;
+        public byte sectorCount;
+        public byte lbaLow;
+        public byte lbaMid;
+        public byte lbaHigh;
+        public byte deviceHead;
+        public byte command;
+    }
+
+    public struct AtaRegistersLBA48
+    {
+        public ushort feature;
+        public ushort sectorCount;
+        public ushort lbaLow;
+        public ushort lbaMid;
+        public ushort lbaHigh;
+        public byte deviceHead;
+        public byte command;
+    }
+
+    public struct AtaErrorRegistersCHS
+    {
+        public byte status;
+        public byte error;
+        public byte sectorCount;
+        public byte sector;
+        public byte cylinderLow;
+        public byte cylinderHigh;
+        public byte deviceHead;
+        public byte command;
+    }
+
+    public struct AtaErrorRegistersLBA28
+    {
+        public byte status;
+        public byte error;
+        public byte sectorCount;
+        public byte lbaLow;
+        public byte lbaMid;
+        public byte lbaHigh;
+        public byte deviceHead;
+        public byte command;
+    }
+
+    public struct AtaErrorRegistersLBA48
+    {
+        public byte status;
+        public byte error;
+        public ushort sectorCount;
+        public ushort lbaLow;
+        public ushort lbaMid;
+        public ushort lbaHigh;
+        public byte deviceHead;
+        public byte command;
+    }
+}
+
diff --git a/ChangeLog b/ChangeLog
index cd18e98..f8ea336 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,12 @@
+2015-11-23  Natalia Portillo  <claunia@claunia.com>
+
+	* ATA/Errors.cs:
+	* DiscImageChef.Decoders.csproj:
+	  Moved ATA register definition to a more common place.
+
+	* SCSI/Sense.cs:
+	  Added information from SAT-4.
+
 2015-11-23  Natalia Portillo  <claunia@claunia.com>
 
 	* SCSI/Sense.cs:
diff --git a/DiscImageChef.Decoders.csproj b/DiscImageChef.Decoders.csproj
index eddc45f..2cf746d 100644
--- a/DiscImageChef.Decoders.csproj
+++ b/DiscImageChef.Decoders.csproj
@@ -83,6 +83,7 @@
     <Compile Include="SCSI\MMC\Features.cs" />
     <Compile Include="SCSI\DiscStructureCapabilities.cs" />
     <Compile Include="SCSI\Sense.cs" />
+    <Compile Include="ATA\Errors.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>
diff --git a/SCSI/Sense.cs b/SCSI/Sense.cs
index 13cb54b..ca92205 100644
--- a/SCSI/Sense.cs
+++ b/SCSI/Sense.cs
@@ -38,6 +38,7 @@
 using System;
 using System.Text;
 using System.Collections.Generic;
+using DiscImageChef.Decoders.ATA;
 
 namespace DiscImageChef.Decoders.SCSI
 {
@@ -621,9 +622,19 @@ namespace DiscImageChef.Decoders.SCSI
             throw new NotImplementedException("Check OSD");
         }
 
-        public static void DecodeDescriptor09(byte[] descriptor)
+        public static AtaErrorRegistersLBA48 DecodeDescriptor09(byte[] descriptor)
         {
-            throw new NotImplementedException("Check SAT-3");
+            AtaErrorRegistersLBA48 errorRegisters = new AtaErrorRegistersLBA48();
+
+            errorRegisters.error = descriptor[3];
+            errorRegisters.sectorCount = (ushort)((descriptor[4] << 8) + descriptor[5]);
+            errorRegisters.lbaLow = (ushort)((descriptor[6] << 8) + descriptor[7]);
+            errorRegisters.lbaMid = (ushort)((descriptor[8] << 8) + descriptor[9]);
+            errorRegisters.lbaHigh = (ushort)((descriptor[10] << 8) + descriptor[11]);
+            errorRegisters.deviceHead = descriptor[12];
+            errorRegisters.status = descriptor[13];
+
+            return errorRegisters;
         }
 
         public static void DecodeDescriptor0B(byte[] descriptor)