| 摘要 |
A memory controller which performs a verification of the state of the erased block is performed prior to the writing operation is disclosed. The memory controller according to said present invention further performs a test operation to judge whether the erased block is a defective block to be disposed or not if the erased block is concluded to be not prefer to store data during the verification. In the case where the block is concluded to be a defective block with a permanent error by the test operation, the block is inhibited to use. In the case where the block is concluded to be a defective block with a transient error by the test operation, on the other hand, the block is treated as new erased block.
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