| 摘要 |
PURPOSE: A memory system and an operating method thereof are provided to determine whether to use the cell block by providing detail information about the number of fail bits of each cell block. CONSTITUTION: Any one cell block is selected among a plurality of cell blocks and a program or an erase operation is performed for testing the selected cell block(S02). If a fail bit is generated, the number of fail bits is compared with the number of the first fail bits(S05). If the number of fail bits exceeds the number of the first fail bits, the number of the second fail bits is compared with the number of the fail bits generated in a test operation(S06). If the number of the fail bits is the number of the second fail bits or less, the selected cell block is classified into the first verification block and data is stored in spare cells of the corresponding cell block(S07).
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