Disk Pack DFM Achieving Minimum Flight Height Variations

As recording area density increases, magnetic recording is approaching near contact regime. Disk deformations, both tangential and circumferential, affect magnetic head flight height (FH) significantly at this FH range, and it becomes increasingly important to magnetic reading and writing performances. Variation in manufacturing process, mechanical tolerance as well as design itself can affect disk deformation greatly. In this presentation, we present a few disk pack design improvements to minimize disk coning and disk crown. The designs are able to achieve consistent disk deformation even under significant manufacturing tolerances.