ACCESS CONTROL PROGRAM OF MAGNETIC DISK APPARATUS, ACCESS CONTROL APPARATUS USING THE ACCESS CONTROL PROGRAM, AND MAGNETIC DISK APPARATUS

摘要

PROBLEM TO BE SOLVED: To provide an access control program of a magnetic disk apparatus in which a suppression effect of the fixed point floating of a magnetic head can be improved. SOLUTION: Since a cylinder in which write-in or read-out is not performed and a skip is performed is provided among different cylinders in which the write-in or read-out of a magnetic disk is performed, a function in which a logic address specified to a read and write command issued by equipment utilizing the magnetic disk apparatus is converted to a converted logic address in which an interval between the last logic address of a cylinder priorly accessing to a cylinder performing write-in or read-out and an initial logic address of a cylinder accessing next is so that the logic address is skipped by the logic address corresponding to a skip cylinder and a function issuing a read and write command specifying this converted logic address to the magnetic disk apparatus are given, the number of skip cylinders is decided within a range in which the total of the number of cylinders required to use and the number of skip cylinders does not exceed the number of cylinders possessed by the magnetic disk. COPYRIGHT: (C)2006,JPO&NCIPI