Data storage device and storage method in which algorithms are provided for calculating access frequencies of data
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United States of America Patent
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Apr 6, 1999
Grant Date -
N/A
app pub date -
Jul 30, 1996
filing date -
Jul 31, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A plurality of data storage media which are constructed in a hierarchical structure of a plurality of levels having different access times and have different access information items are provided, a data storage medium into which data is to be stored is selected according to the access frequency of data, and data is stored according to the result of selection. At the time of data relocation between the data storage media of different hierarchies or between the data storage media of the same hierarchy, one of a plurality of relocation measures is selected according to the characteristics of the data storage media and the characteristic of data to be stored and then data is relocated according to the selected relocation measure.
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