Storage device including controller and method of operating controller

Abstract

The present technology relates to an electronic device. According to the present technology, a storage device includes a plurality of nonvolatile memory devices, a buffer memory configured to temporarily store data provided by the memory devices, and a controller including a descriptor queue storing a plurality of descriptors, wherein the controller controls the memory devices to perform a read operation corresponding to a first descriptor among the plurality of descriptors, performs a first status check operation of checking whether read data read through the read operation is stored in the buffer memory, and determines, based on a result of the first status check operation, read data to be output to an external device from among the read data read through the read operation.