Storage device and operating method thereof that outputs status information and read data together

A storage device comprising:

• a nonvolatile memory device;
• and
• a controller that controls the nonvolatile memory device and issues sequentially a first command and a second command, wherein the first command and the second command are to read first data from the nonvolatile memory device,
• wherein the second command is issued a predetermined time after the first command is issued,
• wherein the second command includes a command for outputting to the controller the first data and a status information signal that indicates whether the nonvolatile memory device has completed reading the first data from the nonvolatile memory device,
• wherein the nonvolatile memory device comprises:
• a memory cell array that includes a plurality of memory cells and that reads the first data in response to the first command;
• a control logic that controls the read operation of the memory cell array based on the first command and the second command;
• a page buffer that buffers the first data;
• and
• an input/output interface that, in response to the second command, outputs sequentially to the controller status information indicating whether the read operation of the first data from the memory cell array for the read operation according to the first command has been completed, and second data obtained by buffering the first data in the page buffer.

A method of operating a storage device that includes a nonvolatile memory device and a controller that controls an operation of the nonvolatile memory device, the method comprising:

• issuing, by the controller, a first command to the nonvolatile memory device, wherein the first command is to read first data from the nonvolatile memory device;
• reading, by the nonvolatile memory device, the first data from a memory cell array in response to the first command;
• issuing, by the controller, in a second read mode, a second command to the nonvolatile memory device, wherein the second command is to read the first data from the nonvolatile memory device,
• wherein the second command includes a command for outputting to the controller the first data and a status information signal that indicates whether the nonvolatile memory device has completed reading the first data from the nonvolatile memory device,
• wherein the second command is issued a predetermined time after the first command is issued;
• and
• transferring, by the nonvolatile memory device to the controller, the first data to the controller in response to the second command,
• wherein the transferring comprises delaying an output of the first data for a first time interval and outputting the status information indicating a busy status for the first time interval, in the busy status in which the reading of the first data from the memory cell array for the read operation according to the first command has not been completed.