| 摘要 |
When system data is written to a flash memory, first and second ECCs are generated in correspondence with the system data and its copied data. The system data and the copied data are written to the same page. The first and second ECCs are stored in the redundant area of the page. In this data storage format, even when an uncorrectable bit error occurs in one of the system data and the copied data, correct data can be read out using the other data in which the error does not occur. Since the system data and the copied data are stored in the same page, they can be read out by one operation and thus the operation performance does not deteriorate.
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