Index: branches/eraser6/pluginsRewrite/Eraser.DefaultPlugins/ErasureMethods/ErasureMethodBase.cs
===================================================================
--- branches/eraser6/pluginsRewrite/Eraser.DefaultPlugins/ErasureMethods/ErasureMethodBase.cs	(revision 2461)
+++ branches/eraser6/pluginsRewrite/Eraser.DefaultPlugins/ErasureMethods/ErasureMethodBase.cs	(revision 2463)
@@ -98,5 +98,6 @@
 	abstract class UnusedSpaceErasureMethodBase : ErasureMethodBase, IUnusedSpaceErasureMethod
 	{
-		void EraseUnusedSpace(Stream stream, IPrng prng, ErasureMethodProgressFunction callback)
+		public virtual void EraseUnusedSpace(Stream stream, IPrng prng,
+			ErasureMethodProgressFunction callback)
 		{
 			Erase(stream, long.MaxValue, prng, callback);