CPC G11C 29/50004 (2013.01) [G11C 2029/5004 (2013.01)] | 20 Claims |
1. A method of operating a storage controller which communicates with a non-volatile memory device, the method comprising:
outputting a first command including a request for on-chip valley search (OVS) count data of a memory region of the non-volatile memory device to the non-volatile memory device, wherein the OVS count data include a first count value of a first read voltage and a second count value of a second read voltage;
receiving the OVS count data from the non-volatile memory device;
determining a first error count value for the first read voltage and a second error count value for the second read voltage, based on the OVS count data; and
determining a subsequent operation, based on the first and second error count values.
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