diff --git a/Hardware/HDD/DriveAttributeValue.cs b/Hardware/HDD/DriveAttributeValue.cs
index f3ced81..4ce5190 100644
--- a/Hardware/HDD/DriveAttributeValue.cs
+++ b/Hardware/HDD/DriveAttributeValue.cs
@@ -4,7 +4,7 @@
   License, v. 2.0. If a copy of the MPL was not distributed with this
   file, You can obtain one at http://mozilla.org/MPL/2.0/.
  
-  Copyright (C) 2011 Michael Möller <mmoeller@openhardwaremonitor.org>
+  Copyright (C) 2011-2012 Michael Möller <mmoeller@openhardwaremonitor.org>
 	
 */
 
@@ -15,7 +15,7 @@ using System.Runtime.InteropServices;
 namespace OpenHardwareMonitor.Hardware.HDD {
 
   [StructLayout(LayoutKind.Sequential, Pack = 1)]
-  public struct DriveAttributeValue {
+  internal struct DriveAttributeValue {
     public byte Identifier;
     public short StatusFlags;
     public byte AttrValue;
diff --git a/Hardware/HDD/DriveThresholdValue.cs b/Hardware/HDD/DriveThresholdValue.cs
index f03bace..13bc46c 100644
--- a/Hardware/HDD/DriveThresholdValue.cs
+++ b/Hardware/HDD/DriveThresholdValue.cs
@@ -4,7 +4,7 @@
   License, v. 2.0. If a copy of the MPL was not distributed with this
   file, You can obtain one at http://mozilla.org/MPL/2.0/.
  
-  Copyright (C) 2011 Michael Möller <mmoeller@openhardwaremonitor.org>
+  Copyright (C) 2011-2012 Michael Möller <mmoeller@openhardwaremonitor.org>
 	
 */
 
@@ -14,7 +14,7 @@ using System.Runtime.InteropServices;
 namespace OpenHardwareMonitor.Hardware.HDD {
 
   [StructLayout(LayoutKind.Sequential, Pack = 1)]
-  public struct DriveThresholdValue {
+  internal struct DriveThresholdValue {
     public byte Identifier;
     public byte Threshold;
     [MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)]
diff --git a/Hardware/HDD/ISmart.cs b/Hardware/HDD/ISmart.cs
index 811bdb2..ac49b29 100644
--- a/Hardware/HDD/ISmart.cs
+++ b/Hardware/HDD/ISmart.cs
@@ -14,7 +14,7 @@ using System.Collections.Generic;
 
 namespace OpenHardwareMonitor.Hardware.HDD {
 
-  public interface ISmart {
+  internal interface ISmart {
 
     IntPtr OpenDrive(int driveNumber);