Non-volatile data storage system and data storaging method

A memory unit including a memory device having at least one of a data unit and a semiconductor memory chip having a management unit corresponding to said data unit,

• wherein said memory device is divided into a plurality of memory areas, management information capable of controlling separately each of said memory areas for accessing from outside is tabled in said data unit,
• wherein said management information includes at least one of first to fourth information, said first control information prohibiting writing data in a prescribed memory area of said plural memory areas, said second control information prohibiting reading out data from a prescribed memory area of said plural memory areas, said third control information being capable of performing simultaneously mirroring for storing data which are written in a prescribed memory area of said plural memory areas in a plurality of places at a same time, and said fourth control information being capable of time difference mirroring for storing data which are written in a prescribed memory area of said plural memory areas in plural places after a prescribed time has passed.

A method for controlling a memory device including at least one semiconductor memory chip having a data unit and a management unit corresponding to said data unit,

• wherein, when said memory device is divided into plural memory areas, the method comprises a step for controlling separately said memory device by each memory area based on management information that is tabled on said data unit, by including at least one of first to fourth control information, said first control information prohibiting writing data in a prescribed memory area of said plural memory areas, said second control information prohibiting reading out data from a prescribed memory area of said plural memory areas, said third control information storing data that are written in a prescribed memory area of said plural memory areas in plural places nearly at a same time, and said fourth control information storing data that are written in a prescribed memory area of said plural memory areas in plural places after a prescribed time has passed.