Patent ID: 11868647
Assignee: SAMSUNG ELECTRONICS CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 12:
13. A reading method of a storage device, the reading method comprising:
performing, in at least one nonvolatile memory device, a first on-chip valley search (OVS) sensing operation on selected memory cells in response to a first read command received from a memory controller;
extracting variation information of threshold voltages of the selected memory cells and deterioration information of a memory block including the selected memory cells;
performing a first main sensing operation at a modified reading level based on the variation information and the deterioration information; and
outputting a result of the first OVS sensing operation and data of the first main sensing operation to the memory controller,
wherein the first OVS sensing operation and the first main sensing operation are defined as a first reading operation.