Patent ID: 11961559
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A storage device comprising:
a nonvolatile memory device including a plurality of memory blocks, wherein each of the plurality of memory blocks includes a plurality of cell strings each including at least one ground selection transistor, two or more memory cells, and at least one string selection transistor stacked on a substrate in a direction perpendicular to the substrate; and
a memory controller, wherein:
in a selected memory block selected from the plurality of memory blocks, the memory controller controls the nonvolatile memory device to perform a read operation on memory cells belonging to a selected page from among the memory cells in the plurality of cell strings,
after the read operation in the selected memory block, the memory controller controls the nonvolatile memory device to perform a first check read operation on memory cells of a first neighbor page associated with the selected page while sequentially selecting sets of read voltages,
after the first check read operation in the selected memory block, the memory controller controls the nonvolatile memory device to perform a second check read operation on memory cells of a second neighbor page associated with the selected page while sequentially selecting the sets of read voltages, and
in the second check read operation, the memory controller first selects a set of read voltages that are used in the first check read operation and for which error correction succeeds, from among the sets of read voltages.