leVCN 724 fs/ntfs/layout.h /* 16*/ leVCN lowest_vcn;/* Lowest valid virtual cluster number leVCN 729 fs/ntfs/layout.h /* 24*/ leVCN highest_vcn;/* Highest valid vcn of this extent of leVCN 967 fs/ntfs/layout.h /* 8*/ leVCN lowest_vcn; /* Lowest virtual cluster number of this portion leVCN 2046 fs/ntfs/layout.h /* 16*/ leVCN index_block_vcn; /* Virtual cluster number of the index block.