| 摘要 |
The present invention relates to a storage unit which purges unnecessary data immediately and transfers data with high probability of future hits from a disk medium to a segment buffer in advance, thereby improving the performance of the storage unit. An access data feature value calculating section calculates feature values of data to be stored in a new generated segment and relationships between preceding and succeeding commands. Next, a purged-segment feature value looking up section retains the feature values for a predetermined period after segment data is purged from a segment buffer and stores the feature values of the purged segment as feature values of a segment with a high hit probability after the purge, when an address stored by the purged segment is read again. Then, a management section does not purge a segment, when the segment has feature values similar to those of the segment having a high hit probability, while purging segments with different feature values.
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