diff --git a/ArrayFill.cs b/ArrayFill.cs
index c3ba54cc6..9798aee1f 100644
--- a/ArrayFill.cs
+++ b/ArrayFill.cs
@@ -32,7 +32,7 @@ using System;
 
 namespace DiscImageChef
 {
-    public static class ArrayHelpers
+    public static partial class ArrayHelpers
     {
         public static void ArrayFill<T>(T[] destinationArray, T value)
         {
diff --git a/ArrayIsEmpty.cs b/ArrayIsEmpty.cs
new file mode 100644
index 000000000..35ee8f868
--- /dev/null
+++ b/ArrayIsEmpty.cs
@@ -0,0 +1,69 @@
+// /***************************************************************************
+// The Disc Image Chef
+// ----------------------------------------------------------------------------
+//
+// Filename       : ArrayIsEmpty.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
+{
+    public static partial class ArrayHelpers
+    {
+        public static bool ArrayIsNullOrWhiteSpace(byte[] array)
+        {
+            if (array == null)
+                return true;
+
+            foreach (byte b in array)
+                if (b != 0x00 && b != 0x20)
+                    return false;
+
+            return true;
+        }
+
+        public static bool ArrayIsNullOrEmpty(byte[] array)
+        {
+            if (array == null)
+                return true;
+
+            foreach (byte b in array)
+                if (b != 0x00)
+                    return false;
+
+            return true;
+        }
+    }
+}
+
diff --git a/ChangeLog b/ChangeLog
index 9a709ca09..e4872eee0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,11 @@
+2016-01-13  Natalia Portillo  <claunia@claunia.com>
+
+	* ArrayFill.cs:
+	* ArrayIsEmpty.cs:
+	* DiscImageChef.Helpers.csproj:
+	  Implemented Certance, Fujitsu and Hewlett-Packard vendor
+	  commands.
+
 2015-12-30  Natalia Portillo  <claunia@claunia.com>
 
 	* StringHandlers.cs:
diff --git a/DiscImageChef.Helpers.csproj b/DiscImageChef.Helpers.csproj
index fece7f719..7d7520eaa 100644
--- a/DiscImageChef.Helpers.csproj
+++ b/DiscImageChef.Helpers.csproj
@@ -41,6 +41,7 @@
     <Compile Include="PrintHex.cs" />
     <Compile Include="StringHandlers.cs" />
     <Compile Include="Swapping.cs" />
+    <Compile Include="ArrayIsEmpty.cs" />
   </ItemGroup>
   <Import Project="$(MSBuildBinPath)\Microsoft.CSharp.targets" />
   <ItemGroup>