Patent ID: 8810954
Filing Date: 2014-08-19
Classification: G11B

Abstract:
1. A disk storage apparatus comprising: a magnetic head including a main pole and a high-frequency-assisted element, the magnetic head configured to generate a write magnetic field, from the main pole, to perform perpendicular magnetic recording on a magnetic disk in response to a input write signal, and apply a high-frequency magnetic field on the basis of the high-frequency-assisted element to the magnetic disk in recording data; and a controller configured to determine at regular intervals whether a recording density of the write signal belongs to a low-density region or a high-density region with reference to a reference density; and relatively reduce a current to energize the high-frequency-assisted element at a timing of the low-density region to be less than a current of the high-density region, in accordance with the low-density region or the high-density region in recording the data.