CPC G11C 29/42 (2013.01) [G11C 29/1201 (2013.01); G11C 29/12005 (2013.01); G11C 29/4401 (2013.01)] | 20 Claims |
1. A storage device comprising:
a memory device configured to store a history read table including root bit information, read voltage information, and error bit information on each of a plurality of memory blocks, and perform a read operation of reading data stored in the plurality of memory blocks based on the history read table; and
a memory controller configured to:
change, when the read operation fails, a level of a read voltage and control the memory device to perform a read retry operation of retrying the read operation by using the changed read voltage, and
determine, when the read retry operation passes, whether the history read table is to be updated by comparing the root bit information of the read retry operation with the root bit information of the history read table.
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