Controller, memory system and operating method thereof

Abstract

Various embodiments relate to a controller, a memory system and an operating method thereof. In one embodiment, a memory system may include a nonvolatile memory device including a plurality of super blocks each comprising a plurality of memory blocks; and a controller configured to control the nonvolatile memory device, wherein the controller is configured to: determine, based on a number of low performance super blocks among the plurality of super blocks, a dirty status threshold value for determining a dirty status of the nonvolatile memory device; determine whether the nonvolatile memory device is in the dirty status based on a number of free super blocks among the plurality of super blocks and the dirty status threshold value; and perform a garbage collection operation on the plurality of super blocks when it is determined that the nonvolatile memory device is in the dirty status.