公开(公告)号：JP2003085903A

公开(公告)日：2003-03-20

申请号：JP2002205934

申请日：2002-07-15

Applicant: ST MICROELECTRONICS INC

Inventor： STEVENS ARTHUR L ,  DELELLIS JOSEPH R

IPC: G11B5/48 ,  G11B5/55 ,  G11B5/596 ,  G11B21/10

Abstract: PROBLEM TO BE SOLVED: To provide an improved method and device which discriminate and control the position of a read/write head relatively to a track on a magnetic disk. SOLUTION: A head position control system for the dual-stage actuation is provided. A feedback system is provided which correct a primary and a secondary input command to generate a primary and a secondary error signal. A controller receives the primary and secondary error signals and sends positioning information to a primary and a secondary actuator. The feedback system generates a position error signal (PES) by using information from a servo wedge and line-out information and the secondary error signal by using PES, and also generates a regenerated error signal for a primary actuator arm by processing a counterelectromotive force signal from the primary actuator. The primary error signal is generated by correcting the primary input signal with the regenerated error signal.