| 摘要 |
PURPOSE:To attain a high speed access to a desired track by referring to track management information stored in a management storing means and controlling an information writing/information reading to plural storing tracks of a storing medium. CONSTITUTION:When a reading request, for instance to a disk device 15 through an interface 13 from a host is waited for and the reading request is executed, a CPU 11 makes an access to a nonvolatile memory 1 to refer to a track management table constituted in the nonvolatile memory 1 and decides whether the requested track is a defective track or not. If the track is defective, the substitute track of the disk device 15 is made access based on an address stored in the substitute track address 3 of the track management table, desired information is read, transferred to the host through the interface 13 to complete the control. If the track is normal, the requested track of the disk device 15 is made access.
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