Patent ID: 7729078
Filing Date: 2010-06-01
Classification: G11B

Abstract:
1. An information storage device, where an information storage medium in a form of a disc in which information is stored is rotated, and a head is moved above the rotating information storage medium in order to access information, comprising: a drive section that moves the head above the information storage medium; and a control section that controls the drive section, wherein the information storage medium is formed such that a plurality of tracks in stripe-shape that extend in the direction of the circumference of the information storage medium and circle around a center of the disc of the information storage medium are aligned in the direction of the radius of the information storage medium, and each of the plurality of tracks is formed such that a first region and a second region repeat alternately, the first region is a region for user information to be written in and to be read from and extend in stripe-shape in the direction of the circumference and the second region stores information for positioning the head, and the control section comprises: a feedback control value determining section that finds a difference between a position of the head in the direction of the radius which is obtained through reading by the head in the second region and a representative position of the first region as an object for accessing in the direction of the radius and that determines a feedback control value for feedback control to eliminate the difference; a control performing value determining section that has a table where the first region is associated with a logic control value, the control value being logically required to move the head to the representative position in the first region, finds the logic control value associated with the first region for which the feedback control value is determined by the feedback control value determining section using the table, and determines a control performing value for performing control by adding the feedback control value determined by the feedback control value determining section to the logic control value; and a control performing section that performs control over the drive section on the basis of the control performing value determined by the control performing value determining section.