Patent ID: 7626841

Claim:
A content data storage device which stores content data in nonvolatile memories from which data is erasable in units of blocks, comprising: a bus width conversion unit which converts a transmission bus of the content data to buses of a plurality of systems; a storage unit which includes a plurality of sets of memories where the nonvolatile memories are connected to the buses of the plurality of systems, respectively; a plurality of switching units provided for the buses of the plurality of systems and selectively switching between derivation of the content data and derivation of command signals and addresses that instruct read and write operations; a controller configured to perform (i) conversion control by which the bus width of the bus width conversion unit is converted, (ii) state control by which the nonvolatile memory of a given one of the sets of the memories is switched into an active state, (iii) supply control by which the command signals and the addresses are supplied to the storage unit, and (iv) switching control by which the switching units are selectively switched, said controller controlling the operation for reading and writing the content data with reference to the nonvolatile memories when the nonvolatile memories are in the active state; and a plurality of switch on and off units provided for the buses of the plurality of systems and selectively switches on or off the content data, the command signals and the addresses derived from the plurality of switching units.