as the geometry became more complicated (for example, with the introduction of zone bit recording) and drive sizes grew over time, the chs addressing method became restrictive. since the late 1980s, hard drives begun shipping with an embedded disk controller that had good knowledge of the physical geometry; they would however report a false geometry to the computer, e.g., a larger number of heads than actually present, to gain more addressable space. these logical chs values would be translated by the controller, thus chs addressing no longer corresponded to any physical attributes of the drive.