Storage device, data processing system and data writing and readout method

A data processing system, comprising:

• a storage device for processing data stored the storage device, comprising:
• a memory for storing data and an area management information, said area management information being used for managing a state of an area for storing data;
• a controller for converting the area management information into an area management flag corresponding to the area management information and having redundant data appended thereto, and for writing said area management flag into said memory;
• wherein said redundant data is used for determining whether said area management flag stored in said memory has an error by comparison to a number of bit information of the area management flag.

A method of processing data, comprising the steps of:

• storing data and an area management information in a memory of a storage device, said area management information being used for managing a state of an area for storing data;
• converting the area management information into an area management flag corresponding to the area management information and having redundant data appended thereto, and
• writing said area management flag into said memory;
• wherein said redundant data is used for determining whether said area management flag stored in said memory has an error by comparison to a number of bit information of the area management flag.