Patent ID: 9720595
Date: 2017-08-01
CPC Classifications: G06F,G11C

Claim:
1. A method of operating a storage device having a nonvolatile memory including at least one memory block having a plurality of sub-blocks each including a plurality of memory cells, the method comprising: reading backup data of memory cells having a highest program state among the plurality of memory cells connected to at least one word line of a first sub-block, wherein the first sub-block is not erase-requested, adjacent to second sub-block, wherein the second sub-block is an erase-requested sub-block among the plurality of sub-blocks; storing the backup data; erasing the second sub-block; and reprogramming the memory cells having the highest program state among the plurality of memory cells connected to the at least one word line of the first sub-block, on the basis of the backup data, wherein the storage device further comprises a memory controller generating backup read voltage information to output the backup read voltage information to the nonvolatile memory; and wherein the backup data of the memory cells having the highest program state among the plurality of memory cells connected to the at least one word line of the first sub-block is read in response to the backup read voltage information.