ST2000DM001 hard drive has two types of heads and platters: 1, 2 platters, 4 heads, over 500g, r/w 160mb/s, light groove; 2, 3 platters, 6 heads, over 600g, r/w 135mb/s; deep groove. Users can use level 2 head comb suite to swap heads for both above two types of .