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Invalid Block(s) Invalid blocks are defined as blocks that contain one or more invalid bits whose reliability is not guaranteed by Samsung. Typically, an invalid block will contain a single bad bit. The information regarding the invalid block(s) is so called as the invalid block informa- tion. Devices with invalid block(s) have the same quality level or as devices with all valid blocks and have the same AC and DC char- acteristics. An invalid block(s) does not affect the performance of valid block(s) because it is isolated from the bit line and the common source line by a select transistor. The system design must be able to mask out the invalid block(s) via address mapping. The lst block of the NAND Flash, however, is fully guaranteed to be a valid block.
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