Patent ID: 6522497
Filing Date: 2003-02-18
Classification: G11B

Abstract:
A disk drive comprising:a disk having a cylinder group in a radial direction, each cylinder having a data area recorded with data and servo area initially recorded with physical cylinder address information for identifying the cylinder; a head actuator for holding a head for reading and writing data from and into the disk and moving the head to a target position on the disk; generating means for setting an effective cylinder group contained from said cylinder group and generating logical cylinder address information so defined as to correspond to the physical cylinder address information for identifying each cylinder contained in the effective cylinder group; and control means for, when the head is positioned to a target position on the disk, allowing the generating means to find first physical cylinder address information corresponding to the target position with the use of the logical cylinder access information corresponding to the target position and allowing the driving control of the head actuator so as to be equal the first physical cylinder address information and second physical cylinder address information read out by the head from the disk.