Storage device and operating method of storage device

An operating method of a storage device which comprises a plurality of nonvolatile memory devices and a memory controller, the operating method comprising:

• transferring, by the memory controller, first read commands to first nonvolatile memory devices among the plurality of nonvolatile memory devices, in a copyback operation;
• transferring, by the memory controller, first program commands and first data read in response to the first read commands to second nonvolatile memory devices among the plurality of nonvolatile memory devices, in the copyback operation;
• and
• transferring, by the memory controller, suspend commands associated with the first program commands to the second nonvolatile memory devices, in the copyback operation.

A storage device comprising:

• a plurality of nonvolatile memory devices;
• and
• a memory controller configured to control the plurality of nonvolatile memory devices,
• wherein the memory controller is configured to, in a copyback operation belonging to a garbage collection operation:
• transfer first read commands to first nonvolatile memory devices among the plurality of nonvolatile memory devices,
• transfer first program commands and first data read in response to the first read commands to second nonvolatile memory devices among the plurality of nonvolatile memory devices, and
• transfer suspend commands associated with the first program commands to the second nonvolatile memory devices,
• wherein the memory controller is further configured to, in the copyback operation belonging to the garbage collection operation:
• transfer second read commands to third nonvolatile memory devices among the plurality of nonvolatile memory devices, and
• transfer second program commands and second data read by the second read commands to fourth nonvolatile memory devices among the plurality of nonvolatile memory devices, and
• wherein the memory controller is further configured to, in the copyback operation belonging to the garbage collection operation, transfer resume commands to the second nonvolatile memory devices after transferring the second data and the second program commands to the fourth nonvolatile memory devices.