| 摘要 |
PROBLEM TO BE SOLVED: To provide an external storage sub-system for guaranteeing maximum response time and accelerating single/multiple sequential read. SOLUTION: A staging control information table 300 for specifying a range for performing staging from a storage medium 200 to a cache memory 120 is provided and a data transfer means 130 performs a staging processing to the cache memory 120 corresponding to the instruction of the staging control information table 300. By simultaneously reading redundant data as well at the time of reading data from the storage medium 200, response time in the case of failing in data read is shortened. Also, since a look-ahead processing is performed without performing look-ahead judgement, the sequential read is accelerated. Further, when a look-ahead direction is specified by the staging control information table 300, since look-ahead in a reverse direction is executed, a high-speed processing is made possible even at the time of the reverse reproduction of the data.
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