Index: src/libchcore/TTaskManagerStatsSnapshot.cpp
===================================================================
diff -u -r8a2ff3b2b71b45fb525e030167e62f316cb32869 -r294b7d63dfadb4e39fcbb52087983616981d00bd
--- src/libchcore/TTaskManagerStatsSnapshot.cpp	(.../TTaskManagerStatsSnapshot.cpp)	(revision 8a2ff3b2b71b45fb525e030167e62f316cb32869)
+++ src/libchcore/TTaskManagerStatsSnapshot.cpp	(.../TTaskManagerStatsSnapshot.cpp)	(revision 294b7d63dfadb4e39fcbb52087983616981d00bd)
@@ -119,11 +119,13 @@
 			m_dAvgSizeSpeed += spTaskStats->GetAvgSizeSpeed();
 		}
 
+		static_assert(AssumedFileEquivalentSize == TTaskStatsSnapshot::AssumedFileEquivalentSize, "File equivalent sizes differs");
+
 		// we're treating each of the items as 512B object to process
 		// to have some balance between items' count and items' size in
 		// progress information
-		unsigned long long ullProcessed = 512ULL * m_ullProcessedCount + m_ullProcessedSize;
-		unsigned long long ullTotal = 512ULL * m_ullTotalCount + m_ullTotalSize;
+		unsigned long long ullProcessed = AssumedFileEquivalentSize * m_ullProcessedCount + m_ullProcessedSize;
+		unsigned long long ullTotal = AssumedFileEquivalentSize * m_ullTotalCount + m_ullTotalSize;
 
 		if (ullTotal != 0)
 			m_dCombinedProgress = Math::Div64(ullProcessed, ullTotal);
Index: src/libchcore/TTaskManagerStatsSnapshot.h
===================================================================
diff -u -r4fe995b304ea342b50293f92d3c1992b43b820f7 -r294b7d63dfadb4e39fcbb52087983616981d00bd
--- src/libchcore/TTaskManagerStatsSnapshot.h	(.../TTaskManagerStatsSnapshot.h)	(revision 4fe995b304ea342b50293f92d3c1992b43b820f7)
+++ src/libchcore/TTaskManagerStatsSnapshot.h	(.../TTaskManagerStatsSnapshot.h)	(revision 294b7d63dfadb4e39fcbb52087983616981d00bd)
@@ -31,6 +31,9 @@
 	class LIBCHCORE_API TTaskManagerStatsSnapshot
 	{
 	public:
+		static const unsigned long long AssumedFileEquivalentSize = 4096;
+
+	public:
 		TTaskManagerStatsSnapshot();
 		TTaskManagerStatsSnapshot(const TTaskManagerStatsSnapshot& rSrc) = delete;
 
Index: src/libchcore/TTaskStatsSnapshot.cpp
===================================================================
diff -u -r011ceadef0413975974fa61983d903bf1a900ab6 -r294b7d63dfadb4e39fcbb52087983616981d00bd
--- src/libchcore/TTaskStatsSnapshot.cpp	(.../TTaskStatsSnapshot.cpp)	(revision 011ceadef0413975974fa61983d903bf1a900ab6)
+++ src/libchcore/TTaskStatsSnapshot.cpp	(.../TTaskStatsSnapshot.cpp)	(revision 294b7d63dfadb4e39fcbb52087983616981d00bd)
@@ -109,9 +109,8 @@
 		// we're treating each of the items as 4096 bytes object to process
 		// to have some balance between items' count and items' size in
 		// progress information
-		const unsigned long long ullSectorSize = 4096;
-		unsigned long long ullProcessed = ullSectorSize * m_ullProcessedCount + m_ullProcessedSize;
-		unsigned long long ullTotal = ullSectorSize * m_ullTotalCount + m_ullTotalSize;
+		unsigned long long ullProcessed = AssumedFileEquivalentSize * m_ullProcessedCount + m_ullProcessedSize;
+		unsigned long long ullTotal = AssumedFileEquivalentSize * m_ullTotalCount + m_ullTotalSize;
 
 		if (ullTotal != 0)
 			m_dCombinedProgress = Math::Div64(ullProcessed, ullTotal);
Index: src/libchcore/TTaskStatsSnapshot.h
===================================================================
diff -u -r4fe995b304ea342b50293f92d3c1992b43b820f7 -r294b7d63dfadb4e39fcbb52087983616981d00bd
--- src/libchcore/TTaskStatsSnapshot.h	(.../TTaskStatsSnapshot.h)	(revision 4fe995b304ea342b50293f92d3c1992b43b820f7)
+++ src/libchcore/TTaskStatsSnapshot.h	(.../TTaskStatsSnapshot.h)	(revision 294b7d63dfadb4e39fcbb52087983616981d00bd)
@@ -36,6 +36,9 @@
 	class LIBCHCORE_API TTaskStatsSnapshot
 	{
 	public:
+		static const unsigned long long AssumedFileEquivalentSize = 4096;
+
+	public:
 		TTaskStatsSnapshot();
 
 		void Clear();