Operation method of storage controller for nonvolatile memory device

An operation method of a storage controller which is configured to control a nonvolatile memory device, the method comprising:

• performing a reliability operation on a respective memory block included in the nonvolatile memory device to obtain respective error information of the respective memory block;
• setting a respective skip reference value of the respective memory block based on the respective error information;
• skipping a respective reliability operation of the respective memory block a number of times, wherein the number is a natural number corresponding to the respective skip reference value;
• and
• after the reliability operation of the first memory block is skipped the number of times, performing the respective reliability operation of the respective memory block to obtain updated respective error information.

An operation method of a storage controller which is configured to control a nonvolatile memory device, the method comprising:

• performing a first reliability operation on a first memory block included in the nonvolatile memory device to obtain first error information of the first memory block;
• setting a first interval of the first memory block based on the first error information;
• performing a second reliability operation on the first memory block based on the first interval to obtain second error information of the first memory block;
• setting a second interval of the first memory block based on the second error information;
• and
• performing a third reliability operation on the first memory block based on the second interval to obtain third error information of the first memory block.