| 摘要 |
A semiconductor storage device includes a first storage unit having a plurality of first blocks as data write regions; an instructing unit that issues a write instruction of writing data into the first blocks; a converting unit that converts an external address of input data to a memory position in the first block with reference to a conversion table in which external addresses of the data are associated with the memory positions of the data in the first blocks; and a judging unit that judges whether any of the first blocks store valid data associated with the external address based on the memory positions of the input data, wherein the instructing unit issues the write instruction of writing the data into the first block in which the valid data is not stored, when any of the first blocks does not store the valid data.
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