A operating method of a storage device including a nonvolatile memory, where the method may include: receiving a first packet including a read command for the nonvolatile memory from a host according to a first protocol; acquiring first requester information corresponding to an identifier (ID) of the host by parsing the first packet; determining resource priorities based on first requester information; reading data stored in the nonvolatile memory by using resources of the storage device according to the resource priorities; and transmitting the data to the host.