| 摘要 |
PROBLEM TO BE SOLVED: To reduce seek operation to an exchange area in the case of reading data. SOLUTION: It is discriminated whether or not a boaded disk has been subjected to exchange processing (S001 and S002). When the disk is discriminated to have been subjected to exchange processing, it is discriminated whether or not an instruction (e.g. recording, reproduction, etc.), from a host computer is carried out (S003), and when the instruction is discriminated not to be carried out, an exchange sector is accessed, and exchange data are reproduced and stored in a cache memory (S004 and S005).
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