To provide a data storage device capable of reading, even if versions are increased, data of the latest version at high speed.
The data storage device 1 comprises a meta data generation means 23b generating metadata by associating the latest data inputted, the version of the latest data, and the address of data preceding by one generation to the latest data stored in a memory 30; a differential data generation means 21b generating differential data that corresponds to the difference between the latest data and the data preceding by one generation to the latest data stored in the memory 30; and a data change means 23c changing the differential data generated by the differential data generation means 21b to data preceding by one generation to the latest data in reference to the metadata.
COPYRIGHT: (C)2007,JPO&INPIT
Ryo Taguchi
Haruo Yokota
Nakano Mana
Dai Kobayashi
Akitsugu Watanabe
National University Corporation Tokyo Institute of Technology
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Etsuo Tada