Patent ID: 8868853

Claim:
A data processing device comprising: plural kinds of recording media; and a data block management device configured to classify data blocks recorded on said plural kinds of recording media into a plurality of groups and to record each of said plurality of groups on a corresponding one of said plural kinds of recording media, wherein said data block management device performs group reconfiguration processing based on a trend of accesses to said plurality of groups and records a new group obtained as a result of said group reconfiguration processing on a corresponding one of said plural kinds of recording media, wherein in said group reconfiguration processing, if a first parameter representing a trend of sequential access between two different groups exceeds a first threshold value, said data block management device integrates said two different groups to generate said new group, and if a second parameter representing a trend of sequential access within a certain group falls below a second threshold value, said data block management device divides said certain group to generate said new group.