diff --git a/include/Partition.h b/include/Partition.h
index e368fce8..ce070b15 100644
--- a/include/Partition.h
+++ b/include/Partition.h
@@ -115,7 +115,9 @@ public:
 
 	bool strict ;		//Indicator if start and end sectors must stay unchanged
 	bool strict_start ;	//Indicator if start sector must stay unchanged
-	
+
+	Byte_Value sector_size ;  //Sector size of the disk device needed for converting to/from sectors and bytes.
+
 private:
 	void sort_paths_and_remove_duplicates() ;
 
diff --git a/src/Partition.cc b/src/Partition.cc
index 3df0b353..33facd3a 100644
--- a/src/Partition.cc
+++ b/src/Partition.cc
@@ -43,6 +43,7 @@ void Partition::Reset()
 	label .clear() ;
 	uuid .clear() ;
 	partition_number = sector_start = sector_end = sectors_used = sectors_unused = -1;
+	sector_size = 0 ;
 	color .set( "black" ) ;
 	inside_extended = busy = strict = strict_start = false ;
 	logicals .clear() ;