US Patent 10303378 Data storage device

A data storage device includes a host interface unit for generating a host request based on a request received from a host device; a control unit for generating a task based on the host request; and a memory control unit for controlling a nonvolatile memory device based on the task, wherein, when it is determined that an operation of the nonvolatile memory device has failed, the memory control unit transmits a fail information regarding the failed operation to the host interface unit.