diff --git a/include/libtorrent/disk_io_thread.hpp b/include/libtorrent/disk_io_thread.hpp
index fa2c56348..0c5e16862 100644
--- a/include/libtorrent/disk_io_thread.hpp
+++ b/include/libtorrent/disk_io_thread.hpp
@@ -179,6 +179,7 @@ namespace libtorrent
 			, cumulative_write_time(0)
 			, cumulative_hash_time(0)
 			, cumulative_sort_time(0)
+			, total_read_back(0)
 		{}
 
 		// the number of 16kB blocks written
@@ -222,6 +223,7 @@ namespace libtorrent
 		boost::uint32_t cumulative_write_time;
 		boost::uint32_t cumulative_hash_time;
 		boost::uint32_t cumulative_sort_time;
+		int total_read_back;
 	};
 	
 	struct TORRENT_EXPORT disk_buffer_pool : boost::noncopyable
diff --git a/include/libtorrent/storage.hpp b/include/libtorrent/storage.hpp
index 52200b128..d6834076d 100644
--- a/include/libtorrent/storage.hpp
+++ b/include/libtorrent/storage.hpp
@@ -348,7 +348,7 @@ namespace libtorrent
 			, int current_slot);
 
 		void switch_to_full_mode();
-		sha1_hash hash_for_piece_impl(int piece);
+		sha1_hash hash_for_piece_impl(int piece, int* readback = 0);
 
 		int release_files_impl() { return m_storage->release_files(); }
 		int delete_files_impl() { return m_storage->delete_files(); }
diff --git a/src/disk_io_thread.cpp b/src/disk_io_thread.cpp
index a720bfc65..4e341af90 100644
--- a/src/disk_io_thread.cpp
+++ b/src/disk_io_thread.cpp
@@ -2190,7 +2190,8 @@ namespace libtorrent
 
 					ptime hash_start = time_now_hires();
 
-					sha1_hash h = j.storage->hash_for_piece_impl(j.piece);
+					int readback = 0;
+					sha1_hash h = j.storage->hash_for_piece_impl(j.piece, &readback);
 					if (test_error(j))
 					{
 						ret = -1;
@@ -2198,6 +2199,8 @@ namespace libtorrent
 						break;
 					}
 
+					m_cache_stats.total_read_back += readback / m_block_size;
+
 					ret = (j.storage->info()->hash_for_piece(j.piece) == h)?0:-2;
 					if (ret == -2) j.storage->mark_failed(j.piece);
 
diff --git a/src/session_impl.cpp b/src/session_impl.cpp
index c611b78b5..69fd3f792 100644
--- a/src/session_impl.cpp
+++ b/src/session_impl.cpp
@@ -964,6 +964,7 @@ namespace aux {
 			":cumulative write time"
 			":cumulative hash time"
 			":cumulative sort time"
+			":disk total read back"
 			"\n\n", m_stats_logger);
 	}
 #endif
@@ -2739,7 +2740,7 @@ namespace aux {
 				  "%f\t%f\t%f\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t"
 				  "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t"
 				  "%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t%d\t"
-				  "%d\t%d\t%d\n"
+				  "%d\t%d\t%d\t%d\n"
 				, total_milliseconds(now - m_last_log_rotation) / 1000.f
 				, int(m_stat.total_upload() - m_last_uploaded)
 				, int(m_stat.total_download() - m_last_downloaded)
@@ -2833,6 +2834,7 @@ namespace aux {
 				, int(cs.cumulative_write_time)
 				, int(cs.cumulative_hash_time)
 				, int(cs.cumulative_sort_time)
+				, cs.total_read_back
 			);
 			m_last_cache_status = cs;
 			m_last_failed = m_total_failed_bytes;
diff --git a/src/storage.cpp b/src/storage.cpp
index 7fd5babdf..df8b65032 100644
--- a/src/storage.cpp
+++ b/src/storage.cpp
@@ -1710,7 +1710,7 @@ ret:
 		return m_save_path;
 	}
 
-	sha1_hash piece_manager::hash_for_piece_impl(int piece)
+	sha1_hash piece_manager::hash_for_piece_impl(int piece, int* readback)
 	{
 		TORRENT_ASSERT(!m_storage->error());
 
@@ -1725,7 +1725,8 @@ ret:
 
 		int slot = slot_for(piece);
 		TORRENT_ASSERT(slot != has_no_slot);
-		hash_for_slot(slot, ph, m_files.piece_size(piece));
+		int read = hash_for_slot(slot, ph, m_files.piece_size(piece));
+		if (readback) *readback = read;
 		if (m_storage->error()) return sha1_hash(0);
 		return ph.h.final();
 	}