Operating method of non-volatile memory device, storage device, and operating method of storage device

An operating method of a storage device including a storage controller and a non-volatile memory, the operating method comprising:

• generating, by the storage controller, a plurality of pieces of transmission parity data respectively corresponding to a plurality of data lines, the plurality of pieces of transmission parity data including first transmission parity data and second transmission parity data;
• transmitting, by the storage controller and to the non-volatile memory, (i) a plurality of pieces of data respectively corresponding to the plurality of data lines and (ii) the plurality of pieces of transmission parity data respectively corresponding to the plurality of pieces of data, the first transmission parity data being transmitted through a first group of data lines of the plurality of data lines, and the second transmission parity data being transmitted through a second group of data lines of the plurality of data lines;
• performing, by the non-volatile memory, a counting operation to count a number of transmission error bits with respect to each data line in the first group of data lines based on the first transmission parity data;
• performing, by the non-volatile memory, a determination operation to determine that a transmission error exists with respect to each data line in the second group of data lines based on the second transmission parity data;
• determining, by the non-volatile memory, that a condition for performing retraining is satisfied based on a counting result generated from the counting operation and a determination result generated from the determination operation;
• and
• transmitting, by the non-volatile memory, transmission error status information to the storage controller based on a determination that the condition for performing retraining is satisfied.