公开(公告)号：JPH1027442A

公开(公告)日：1998-01-27

申请号：JP1809497

申请日：1997-01-31

Applicant: IBM

Inventor： MUCHUTANBII SURIIJAYANTA ,  ARN SHARMA ,  HIEN DANGU ,  SUZUKI HIROYUKI

IPC: G11B21/10 ,  G11B5/596

Abstract: PROBLEM TO BE SOLVED: To provide a direct access storage device a high track density and low power consumption at low cost by controlling a servo system by using a corrected position error signal obtained by subtracting filtered data from a position error signal. SOLUTION: A direct access storage device(DASD) 32 includes a disk 34 and, when the disk 34 is rotated by a spindle motor 40, the disk 34 interacts with the head 36 of the end part of an actuator 38. A repeating runout component is stored in the reserve data zone of the disk 34 during manufacturing and read in a RAM 42 during power up. The repeating runout component of a RAM base is subtracted from a position error correcting signal(PES) in a next track-following mode.